diff --git a/CHANGELOG.md b/CHANGELOG.md
index bb8c1be848..2439396833 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -31,6 +31,9 @@ and this project adheres to
   add constructor for `Binary`. ([#1876])
 - cosmwasm-vm: Make inner value of `Size` private and add constructor. ([#1876])
 - cosmwasm-vm: Reduce gas values by a factor of 1000. ([#1884])
+- cosmwasm-std: Upgrade to `serde-json-wasm` 1.0. This means `u128` and `i128`
+  are now serialized as numbers instead of strings. Use `Uint128` and `Int128`
+  instead. ([#1939])
 
 [#1874]: https://github.com/CosmWasm/cosmwasm/pull/1874
 [#1876]: https://github.com/CosmWasm/cosmwasm/pull/1876
@@ -38,6 +41,7 @@ and this project adheres to
 [#1884]: https://github.com/CosmWasm/cosmwasm/pull/1884
 [#1898]: https://github.com/CosmWasm/cosmwasm/pull/1898
 [#1902]: https://github.com/CosmWasm/cosmwasm/pull/1902
+[#1939]: https://github.com/CosmWasm/cosmwasm/pull/1939
 
 ### Removed
 
diff --git a/Cargo.lock b/Cargo.lock
index 25b1026961..eb4f764799 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1932,18 +1932,18 @@ checksum = "bebd363326d05ec3e2f532ab7660680f3b02130d780c299bca73469d521bc0ed"
 
 [[package]]
 name = "serde"
-version = "1.0.180"
+version = "1.0.192"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0ea67f183f058fe88a4e3ec6e2788e003840893b91bac4559cabedd00863b3ed"
+checksum = "bca2a08484b285dcb282d0f67b26cadc0df8b19f8c12502c13d966bf9482f001"
 dependencies = [
  "serde_derive",
 ]
 
 [[package]]
 name = "serde-json-wasm"
-version = "0.5.1"
+version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "16a62a1fad1e1828b24acac8f2b468971dade7b8c3c2e672bcadefefb1f8c137"
+checksum = "83c37d03f3b0f6b5f77c11af1e7c772de1c9af83e50bef7bb6069601900ba67b"
 dependencies = [
  "serde",
 ]
@@ -1961,9 +1961,9 @@ dependencies = [
 
 [[package]]
 name = "serde_derive"
-version = "1.0.180"
+version = "1.0.192"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "24e744d7782b686ab3b73267ef05697159cc0e5abbed3f47f9933165e5219036"
+checksum = "d6c7207fbec9faa48073f3e3074cbe553af6ea512d7c21ba46e434e70ea9fbc1"
 dependencies = [
  "proc-macro2",
  "quote",
diff --git a/MIGRATING.md b/MIGRATING.md
index 30b18953f9..04c0b9a24e 100644
--- a/MIGRATING.md
+++ b/MIGRATING.md
@@ -89,6 +89,24 @@ major releases of `cosmwasm`. Note that you can also view the
   +canonical_addr.as_slice()
   ```
 
+- If you use any `u128` or `i128` in storage or message types, replace them with
+  `Uint128` and `Int128` respectively to preserve the current serialization.
+  Failing to do this will result in deserialization errors!
+
+  ```diff
+  #[cw_serde]
+  struct MyStorage {
+  -  a: u128,
+  -  b: i128,
+  +  a: Uint128,
+  +  b: Int128,
+  }
+  const map: Map<u128, MyStorage> = Map::new("map");
+
+  -const item: Item<u128> = Item::new("item");
+  +const item: Item<Uint128> = Item::new("item");
+  ```
+
 ## 1.4.x -> 1.5.0
 
 - Update `cosmwasm-*` dependencies in Cargo.toml (skip the ones you don't use):
diff --git a/contracts/burner/Cargo.lock b/contracts/burner/Cargo.lock
index 059d31c649..039c36a785 100644
--- a/contracts/burner/Cargo.lock
+++ b/contracts/burner/Cargo.lock
@@ -1312,18 +1312,18 @@ checksum = "4c309e515543e67811222dbc9e3dd7e1056279b782e1dacffe4242b718734fb6"
 
 [[package]]
 name = "serde"
-version = "1.0.126"
+version = "1.0.192"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ec7505abeacaec74ae4778d9d9328fe5a5d04253220a85c4ee022239fc996d03"
+checksum = "bca2a08484b285dcb282d0f67b26cadc0df8b19f8c12502c13d966bf9482f001"
 dependencies = [
  "serde_derive",
 ]
 
 [[package]]
 name = "serde-json-wasm"
-version = "0.5.0"
+version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a15bee9b04dd165c3f4e142628982ddde884c2022a89e8ddf99c4829bf2c3a58"
+checksum = "83c37d03f3b0f6b5f77c11af1e7c772de1c9af83e50bef7bb6069601900ba67b"
 dependencies = [
  "serde",
 ]
@@ -1341,13 +1341,13 @@ dependencies = [
 
 [[package]]
 name = "serde_derive"
-version = "1.0.126"
+version = "1.0.192"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "963a7dbc9895aeac7ac90e74f34a5d5261828f79df35cbed41e10189d3804d43"
+checksum = "d6c7207fbec9faa48073f3e3074cbe553af6ea512d7c21ba46e434e70ea9fbc1"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn 2.0.37",
 ]
 
 [[package]]
diff --git a/contracts/crypto-verify/Cargo.lock b/contracts/crypto-verify/Cargo.lock
index 506d42a232..bc88a47b5e 100644
--- a/contracts/crypto-verify/Cargo.lock
+++ b/contracts/crypto-verify/Cargo.lock
@@ -1345,18 +1345,18 @@ checksum = "4c309e515543e67811222dbc9e3dd7e1056279b782e1dacffe4242b718734fb6"
 
 [[package]]
 name = "serde"
-version = "1.0.126"
+version = "1.0.192"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ec7505abeacaec74ae4778d9d9328fe5a5d04253220a85c4ee022239fc996d03"
+checksum = "bca2a08484b285dcb282d0f67b26cadc0df8b19f8c12502c13d966bf9482f001"
 dependencies = [
  "serde_derive",
 ]
 
 [[package]]
 name = "serde-json-wasm"
-version = "0.5.0"
+version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a15bee9b04dd165c3f4e142628982ddde884c2022a89e8ddf99c4829bf2c3a58"
+checksum = "83c37d03f3b0f6b5f77c11af1e7c772de1c9af83e50bef7bb6069601900ba67b"
 dependencies = [
  "serde",
 ]
@@ -1374,13 +1374,13 @@ dependencies = [
 
 [[package]]
 name = "serde_derive"
-version = "1.0.126"
+version = "1.0.192"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "963a7dbc9895aeac7ac90e74f34a5d5261828f79df35cbed41e10189d3804d43"
+checksum = "d6c7207fbec9faa48073f3e3074cbe553af6ea512d7c21ba46e434e70ea9fbc1"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn 2.0.37",
 ]
 
 [[package]]
diff --git a/contracts/cyberpunk/Cargo.lock b/contracts/cyberpunk/Cargo.lock
index b14ddf9a7d..44a1aec8ac 100644
--- a/contracts/cyberpunk/Cargo.lock
+++ b/contracts/cyberpunk/Cargo.lock
@@ -1436,18 +1436,18 @@ checksum = "4c309e515543e67811222dbc9e3dd7e1056279b782e1dacffe4242b718734fb6"
 
 [[package]]
 name = "serde"
-version = "1.0.126"
+version = "1.0.192"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ec7505abeacaec74ae4778d9d9328fe5a5d04253220a85c4ee022239fc996d03"
+checksum = "bca2a08484b285dcb282d0f67b26cadc0df8b19f8c12502c13d966bf9482f001"
 dependencies = [
  "serde_derive",
 ]
 
 [[package]]
 name = "serde-json-wasm"
-version = "0.5.0"
+version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a15bee9b04dd165c3f4e142628982ddde884c2022a89e8ddf99c4829bf2c3a58"
+checksum = "83c37d03f3b0f6b5f77c11af1e7c772de1c9af83e50bef7bb6069601900ba67b"
 dependencies = [
  "serde",
 ]
@@ -1465,13 +1465,13 @@ dependencies = [
 
 [[package]]
 name = "serde_derive"
-version = "1.0.126"
+version = "1.0.192"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "963a7dbc9895aeac7ac90e74f34a5d5261828f79df35cbed41e10189d3804d43"
+checksum = "d6c7207fbec9faa48073f3e3074cbe553af6ea512d7c21ba46e434e70ea9fbc1"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn 2.0.37",
 ]
 
 [[package]]
diff --git a/contracts/floaty/Cargo.lock b/contracts/floaty/Cargo.lock
index 03ee23986d..eeeaa6353f 100644
--- a/contracts/floaty/Cargo.lock
+++ b/contracts/floaty/Cargo.lock
@@ -1329,18 +1329,18 @@ checksum = "4c309e515543e67811222dbc9e3dd7e1056279b782e1dacffe4242b718734fb6"
 
 [[package]]
 name = "serde"
-version = "1.0.126"
+version = "1.0.192"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ec7505abeacaec74ae4778d9d9328fe5a5d04253220a85c4ee022239fc996d03"
+checksum = "bca2a08484b285dcb282d0f67b26cadc0df8b19f8c12502c13d966bf9482f001"
 dependencies = [
  "serde_derive",
 ]
 
 [[package]]
 name = "serde-json-wasm"
-version = "0.5.0"
+version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a15bee9b04dd165c3f4e142628982ddde884c2022a89e8ddf99c4829bf2c3a58"
+checksum = "83c37d03f3b0f6b5f77c11af1e7c772de1c9af83e50bef7bb6069601900ba67b"
 dependencies = [
  "serde",
 ]
@@ -1358,13 +1358,13 @@ dependencies = [
 
 [[package]]
 name = "serde_derive"
-version = "1.0.126"
+version = "1.0.192"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "963a7dbc9895aeac7ac90e74f34a5d5261828f79df35cbed41e10189d3804d43"
+checksum = "d6c7207fbec9faa48073f3e3074cbe553af6ea512d7c21ba46e434e70ea9fbc1"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn 2.0.32",
 ]
 
 [[package]]
diff --git a/contracts/hackatom/Cargo.lock b/contracts/hackatom/Cargo.lock
index 8fa0ef8fd9..cdb8cf7ede 100644
--- a/contracts/hackatom/Cargo.lock
+++ b/contracts/hackatom/Cargo.lock
@@ -1314,18 +1314,18 @@ checksum = "4c309e515543e67811222dbc9e3dd7e1056279b782e1dacffe4242b718734fb6"
 
 [[package]]
 name = "serde"
-version = "1.0.126"
+version = "1.0.192"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ec7505abeacaec74ae4778d9d9328fe5a5d04253220a85c4ee022239fc996d03"
+checksum = "bca2a08484b285dcb282d0f67b26cadc0df8b19f8c12502c13d966bf9482f001"
 dependencies = [
  "serde_derive",
 ]
 
 [[package]]
 name = "serde-json-wasm"
-version = "0.5.0"
+version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a15bee9b04dd165c3f4e142628982ddde884c2022a89e8ddf99c4829bf2c3a58"
+checksum = "83c37d03f3b0f6b5f77c11af1e7c772de1c9af83e50bef7bb6069601900ba67b"
 dependencies = [
  "serde",
 ]
@@ -1343,13 +1343,13 @@ dependencies = [
 
 [[package]]
 name = "serde_derive"
-version = "1.0.126"
+version = "1.0.192"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "963a7dbc9895aeac7ac90e74f34a5d5261828f79df35cbed41e10189d3804d43"
+checksum = "d6c7207fbec9faa48073f3e3074cbe553af6ea512d7c21ba46e434e70ea9fbc1"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn 2.0.37",
 ]
 
 [[package]]
diff --git a/contracts/ibc-reflect-send/Cargo.lock b/contracts/ibc-reflect-send/Cargo.lock
index b0ba960340..656e614d46 100644
--- a/contracts/ibc-reflect-send/Cargo.lock
+++ b/contracts/ibc-reflect-send/Cargo.lock
@@ -1312,18 +1312,18 @@ checksum = "4c309e515543e67811222dbc9e3dd7e1056279b782e1dacffe4242b718734fb6"
 
 [[package]]
 name = "serde"
-version = "1.0.126"
+version = "1.0.192"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ec7505abeacaec74ae4778d9d9328fe5a5d04253220a85c4ee022239fc996d03"
+checksum = "bca2a08484b285dcb282d0f67b26cadc0df8b19f8c12502c13d966bf9482f001"
 dependencies = [
  "serde_derive",
 ]
 
 [[package]]
 name = "serde-json-wasm"
-version = "0.5.0"
+version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a15bee9b04dd165c3f4e142628982ddde884c2022a89e8ddf99c4829bf2c3a58"
+checksum = "83c37d03f3b0f6b5f77c11af1e7c772de1c9af83e50bef7bb6069601900ba67b"
 dependencies = [
  "serde",
 ]
@@ -1341,13 +1341,13 @@ dependencies = [
 
 [[package]]
 name = "serde_derive"
-version = "1.0.126"
+version = "1.0.192"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "963a7dbc9895aeac7ac90e74f34a5d5261828f79df35cbed41e10189d3804d43"
+checksum = "d6c7207fbec9faa48073f3e3074cbe553af6ea512d7c21ba46e434e70ea9fbc1"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn 2.0.37",
 ]
 
 [[package]]
diff --git a/contracts/ibc-reflect/Cargo.lock b/contracts/ibc-reflect/Cargo.lock
index 155dd64dad..5c1407d179 100644
--- a/contracts/ibc-reflect/Cargo.lock
+++ b/contracts/ibc-reflect/Cargo.lock
@@ -1312,18 +1312,18 @@ checksum = "4c309e515543e67811222dbc9e3dd7e1056279b782e1dacffe4242b718734fb6"
 
 [[package]]
 name = "serde"
-version = "1.0.126"
+version = "1.0.192"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ec7505abeacaec74ae4778d9d9328fe5a5d04253220a85c4ee022239fc996d03"
+checksum = "bca2a08484b285dcb282d0f67b26cadc0df8b19f8c12502c13d966bf9482f001"
 dependencies = [
  "serde_derive",
 ]
 
 [[package]]
 name = "serde-json-wasm"
-version = "0.5.0"
+version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a15bee9b04dd165c3f4e142628982ddde884c2022a89e8ddf99c4829bf2c3a58"
+checksum = "83c37d03f3b0f6b5f77c11af1e7c772de1c9af83e50bef7bb6069601900ba67b"
 dependencies = [
  "serde",
 ]
@@ -1341,13 +1341,13 @@ dependencies = [
 
 [[package]]
 name = "serde_derive"
-version = "1.0.126"
+version = "1.0.192"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "963a7dbc9895aeac7ac90e74f34a5d5261828f79df35cbed41e10189d3804d43"
+checksum = "d6c7207fbec9faa48073f3e3074cbe553af6ea512d7c21ba46e434e70ea9fbc1"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn 2.0.37",
 ]
 
 [[package]]
diff --git a/contracts/queue/Cargo.lock b/contracts/queue/Cargo.lock
index 21c40a3ce4..2cc2910726 100644
--- a/contracts/queue/Cargo.lock
+++ b/contracts/queue/Cargo.lock
@@ -1312,18 +1312,18 @@ checksum = "4c309e515543e67811222dbc9e3dd7e1056279b782e1dacffe4242b718734fb6"
 
 [[package]]
 name = "serde"
-version = "1.0.126"
+version = "1.0.192"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ec7505abeacaec74ae4778d9d9328fe5a5d04253220a85c4ee022239fc996d03"
+checksum = "bca2a08484b285dcb282d0f67b26cadc0df8b19f8c12502c13d966bf9482f001"
 dependencies = [
  "serde_derive",
 ]
 
 [[package]]
 name = "serde-json-wasm"
-version = "0.5.0"
+version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a15bee9b04dd165c3f4e142628982ddde884c2022a89e8ddf99c4829bf2c3a58"
+checksum = "83c37d03f3b0f6b5f77c11af1e7c772de1c9af83e50bef7bb6069601900ba67b"
 dependencies = [
  "serde",
 ]
@@ -1341,13 +1341,13 @@ dependencies = [
 
 [[package]]
 name = "serde_derive"
-version = "1.0.126"
+version = "1.0.192"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "963a7dbc9895aeac7ac90e74f34a5d5261828f79df35cbed41e10189d3804d43"
+checksum = "d6c7207fbec9faa48073f3e3074cbe553af6ea512d7c21ba46e434e70ea9fbc1"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn 2.0.37",
 ]
 
 [[package]]
diff --git a/contracts/reflect/Cargo.lock b/contracts/reflect/Cargo.lock
index 883d4e958b..ddf696931c 100644
--- a/contracts/reflect/Cargo.lock
+++ b/contracts/reflect/Cargo.lock
@@ -1313,18 +1313,18 @@ checksum = "4c309e515543e67811222dbc9e3dd7e1056279b782e1dacffe4242b718734fb6"
 
 [[package]]
 name = "serde"
-version = "1.0.103"
+version = "1.0.192"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "1217f97ab8e8904b57dd22eb61cde455fa7446a9c1cf43966066da047c1f3702"
+checksum = "bca2a08484b285dcb282d0f67b26cadc0df8b19f8c12502c13d966bf9482f001"
 dependencies = [
  "serde_derive",
 ]
 
 [[package]]
 name = "serde-json-wasm"
-version = "0.5.0"
+version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a15bee9b04dd165c3f4e142628982ddde884c2022a89e8ddf99c4829bf2c3a58"
+checksum = "83c37d03f3b0f6b5f77c11af1e7c772de1c9af83e50bef7bb6069601900ba67b"
 dependencies = [
  "serde",
 ]
@@ -1342,13 +1342,13 @@ dependencies = [
 
 [[package]]
 name = "serde_derive"
-version = "1.0.103"
+version = "1.0.192"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a8c6faef9a2e64b0064f48570289b4bf8823b7581f1d6157c1b52152306651d0"
+checksum = "d6c7207fbec9faa48073f3e3074cbe553af6ea512d7c21ba46e434e70ea9fbc1"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn 2.0.37",
 ]
 
 [[package]]
diff --git a/contracts/reflect/Cargo.toml b/contracts/reflect/Cargo.toml
index 8ef7e171b2..6e471dfddb 100644
--- a/contracts/reflect/Cargo.toml
+++ b/contracts/reflect/Cargo.toml
@@ -36,7 +36,7 @@ backtraces = ["cosmwasm-std/backtraces", "cosmwasm-vm/backtraces"]
 cosmwasm-schema = { path = "../../packages/schema" }
 cosmwasm-std = { path = "../../packages/std", default-features = false, features = ["staking", "stargate", "cosmwasm_1_4"] }
 schemars = "0.8.3"
-serde = { version = "=1.0.103", default-features = false, features = ["derive"] }
+serde = { version = "1.0.103", default-features = false, features = ["derive"] }
 thiserror = "1.0.26"
 
 [dev-dependencies]
diff --git a/contracts/staking/Cargo.lock b/contracts/staking/Cargo.lock
index 5560f10518..939c78f4e7 100644
--- a/contracts/staking/Cargo.lock
+++ b/contracts/staking/Cargo.lock
@@ -1307,18 +1307,18 @@ checksum = "4c309e515543e67811222dbc9e3dd7e1056279b782e1dacffe4242b718734fb6"
 
 [[package]]
 name = "serde"
-version = "1.0.126"
+version = "1.0.192"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ec7505abeacaec74ae4778d9d9328fe5a5d04253220a85c4ee022239fc996d03"
+checksum = "bca2a08484b285dcb282d0f67b26cadc0df8b19f8c12502c13d966bf9482f001"
 dependencies = [
  "serde_derive",
 ]
 
 [[package]]
 name = "serde-json-wasm"
-version = "0.5.0"
+version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a15bee9b04dd165c3f4e142628982ddde884c2022a89e8ddf99c4829bf2c3a58"
+checksum = "83c37d03f3b0f6b5f77c11af1e7c772de1c9af83e50bef7bb6069601900ba67b"
 dependencies = [
  "serde",
 ]
@@ -1336,13 +1336,13 @@ dependencies = [
 
 [[package]]
 name = "serde_derive"
-version = "1.0.126"
+version = "1.0.192"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "963a7dbc9895aeac7ac90e74f34a5d5261828f79df35cbed41e10189d3804d43"
+checksum = "d6c7207fbec9faa48073f3e3074cbe553af6ea512d7c21ba46e434e70ea9fbc1"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn 2.0.37",
 ]
 
 [[package]]
diff --git a/contracts/virus/Cargo.lock b/contracts/virus/Cargo.lock
index 7ea3b2995b..859dd66413 100644
--- a/contracts/virus/Cargo.lock
+++ b/contracts/virus/Cargo.lock
@@ -1301,18 +1301,18 @@ checksum = "4c309e515543e67811222dbc9e3dd7e1056279b782e1dacffe4242b718734fb6"
 
 [[package]]
 name = "serde"
-version = "1.0.126"
+version = "1.0.192"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ec7505abeacaec74ae4778d9d9328fe5a5d04253220a85c4ee022239fc996d03"
+checksum = "bca2a08484b285dcb282d0f67b26cadc0df8b19f8c12502c13d966bf9482f001"
 dependencies = [
  "serde_derive",
 ]
 
 [[package]]
 name = "serde-json-wasm"
-version = "0.5.0"
+version = "1.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "a15bee9b04dd165c3f4e142628982ddde884c2022a89e8ddf99c4829bf2c3a58"
+checksum = "83c37d03f3b0f6b5f77c11af1e7c772de1c9af83e50bef7bb6069601900ba67b"
 dependencies = [
  "serde",
 ]
@@ -1330,13 +1330,13 @@ dependencies = [
 
 [[package]]
 name = "serde_derive"
-version = "1.0.126"
+version = "1.0.192"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "963a7dbc9895aeac7ac90e74f34a5d5261828f79df35cbed41e10189d3804d43"
+checksum = "d6c7207fbec9faa48073f3e3074cbe553af6ea512d7c21ba46e434e70ea9fbc1"
 dependencies = [
  "proc-macro2",
  "quote",
- "syn 1.0.109",
+ "syn 2.0.37",
 ]
 
 [[package]]
diff --git a/docs/MESSAGE_TYPES.md b/docs/MESSAGE_TYPES.md
index 8c34243704..006e99596e 100644
--- a/docs/MESSAGE_TYPES.md
+++ b/docs/MESSAGE_TYPES.md
@@ -9,28 +9,28 @@ this reason, the CosmWasm standard library `cosmwasm-std` ships types that
 ensure good user experience in JSON. The following table shows both standard
 Rust types as well as `cosmwasm_std` types and how they are encoded in JSON.
 
-| Rust type           | JSON type[^1]                             | Example                                                                               | Note                                                                                                                                                                                   |
-| ------------------- | ----------------------------------------- | ------------------------------------------------------------------------------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
-| bool                | `true` or `false`                         | `true`                                                                                |                                                                                                                                                                                        |
-| u32/i32             | number                                    | `123`                                                                                 |                                                                                                                                                                                        |
-| u64/i64             | number                                    | `123456`                                                                              | Supported in Rust and Go. Other implementations (`jq`, `JavaScript`) do not support the full uint64/int64 range.                                                                       |
-| u128/i128           | string                                    | `"340282366920938463463374607431768211455", "-2766523308300312711084346401884294402"` | 🚫 Strongly discouraged because the JSON type in serde-json-wasm is wrong and will change. See [Dev Note #4: u128/i128 serialization][dev-note-4].                                     |
-| usize/isize         | number                                    | `123456`                                                                              | 🚫 Don't use this type because it has a different size in unit tests (64 bit) and Wasm (32 bit). Also it tends to issue float instructions such that the contracts cannot be uploaded. |
-| String              | string                                    | `"foo"`                                                                               |
-| &str                | string                                    | `"foo"`                                                                               | 🚫 Unsuppored since message types must be owned (DeserializeOwned)                                                                                                                     |
-| Option\<T\>         | `null` or JSON type of `T`                | `null`, `{"foo":12}`                                                                  |                                                                                                                                                                                        |
-| Vec\<T\>            | array of JSON type of `T`                 | `["one", "two", "three"]` (Vec\<String\>), `[true, false]` (Vec\<bool\>)              |
-| Vec\<u8\>           | array of numbers from 0 to 255            | `[187, 61, 11, 250]`                                                                  | ⚠️ Discouraged as this encoding is not as compact as it can be. See `Binary`.                                                                                                          |
-| struct MyType { … } | object                                    | `{"foo":12}`                                                                          |                                                                                                                                                                                        |
-| [Uint64]/[Int64]    | string containing number                  | `"1234321"`, `"-1234321"`                                                             | Used to support full uint64/int64 range in all implementations                                                                                                                         |
-| [Uint128]/[Int128]  | string containing number                  | `"1234321"`, `"-1234321"`                                                             |                                                                                                                                                                                        |
-| [Uint256]/[Int256]  | string containing number                  | `"1234321"`, `"-1234321"`                                                             |                                                                                                                                                                                        |
-| [Uint512]/[Int512]  | string containing number                  | `"1234321"`, `"-1234321"`                                                             |                                                                                                                                                                                        |
-| [Decimal]           | string containing decimal number          | `"55.6584"`                                                                           |                                                                                                                                                                                        |
-| [Decimal256]        | string containing decimal number          | `"55.6584"`                                                                           |                                                                                                                                                                                        |
-| [Binary]            | string containing base64 data             | `"MTIzCg=="`                                                                          |                                                                                                                                                                                        |
-| [HexBinary]         | string containing hex data                | `"b5d7d24e428c"`                                                                      |                                                                                                                                                                                        |
-| [Timestamp]         | string containing nanoseconds since epoch | `"1677687687000000000"`                                                               |                                                                                                                                                                                        |
+| Rust type           | JSON type[^1]                             | Example                                                                           | Note                                                                                                                                                                                                                                                                           |
+| ------------------- | ----------------------------------------- | --------------------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
+| bool                | `true` or `false`                         | `true`                                                                            |                                                                                                                                                                                                                                                                                |
+| u32/i32             | number                                    | `123`                                                                             |                                                                                                                                                                                                                                                                                |
+| u64/i64             | number                                    | `123456`                                                                          | Supported in Rust and Go. Other implementations (`jq`, `JavaScript`) do not support the full uint64/int64 range.                                                                                                                                                               |
+| u128/i128           | number                                    | `340282366920938463463374607431768211455, -2766523308300312711084346401884294402` | Supported in Rust. Other implementations do not support the full range. This used to be serialized as a string in serde-json-wasm. See [Dev Note #4: u128/i128 serialization][dev-note-4]. If you have any code relying on that serialization, switch to `Uint128` / `Int128`. |
+| usize/isize         | number                                    | `123456`                                                                          | 🚫 Don't use this type because it has a different size in unit tests (64 bit) and Wasm (32 bit). Also it tends to issue float instructions such that the contracts cannot be uploaded.                                                                                         |
+| String              | string                                    | `"foo"`                                                                           |
+| &str                | string                                    | `"foo"`                                                                           | 🚫 Unsuppored since message types must be owned (DeserializeOwned)                                                                                                                                                                                                             |
+| Option\<T\>         | `null` or JSON type of `T`                | `null`, `{"foo":12}`                                                              |                                                                                                                                                                                                                                                                                |
+| Vec\<T\>            | array of JSON type of `T`                 | `["one", "two", "three"]` (Vec\<String\>), `[true, false]` (Vec\<bool\>)          |
+| Vec\<u8\>           | array of numbers from 0 to 255            | `[187, 61, 11, 250]`                                                              | ⚠️ Discouraged as this encoding is not as compact as it can be. See `Binary`.                                                                                                                                                                                                  |
+| struct MyType { … } | object                                    | `{"foo":12}`                                                                      |                                                                                                                                                                                                                                                                                |
+| [Uint64]/[Int64]    | string containing number                  | `"1234321"`, `"-1234321"`                                                         | Used to support full uint64/int64 range in all implementations                                                                                                                                                                                                                 |
+| [Uint128]/[Int128]  | string containing number                  | `"1234321"`, `"-1234321"`                                                         |                                                                                                                                                                                                                                                                                |
+| [Uint256]/[Int256]  | string containing number                  | `"1234321"`, `"-1234321"`                                                         |                                                                                                                                                                                                                                                                                |
+| [Uint512]/[Int512]  | string containing number                  | `"1234321"`, `"-1234321"`                                                         |                                                                                                                                                                                                                                                                                |
+| [Decimal]           | string containing decimal number          | `"55.6584"`                                                                       |                                                                                                                                                                                                                                                                                |
+| [Decimal256]        | string containing decimal number          | `"55.6584"`                                                                       |                                                                                                                                                                                                                                                                                |
+| [Binary]            | string containing base64 data             | `"MTIzCg=="`                                                                      |                                                                                                                                                                                                                                                                                |
+| [HexBinary]         | string containing hex data                | `"b5d7d24e428c"`                                                                  |                                                                                                                                                                                                                                                                                |
+| [Timestamp]         | string containing nanoseconds since epoch | `"1677687687000000000"`                                                           |                                                                                                                                                                                                                                                                                |
 
 [uint64]: https://docs.rs/cosmwasm-std/1.3.3/cosmwasm_std/struct.Uint64.html
 [uint128]: https://docs.rs/cosmwasm-std/1.3.3/cosmwasm_std/struct.Uint128.html
diff --git a/packages/std/Cargo.toml b/packages/std/Cargo.toml
index 2ab60fcb5f..24cf779ed5 100644
--- a/packages/std/Cargo.toml
+++ b/packages/std/Cargo.toml
@@ -58,7 +58,7 @@ serde = { version = "1.0.103", default-features = false, features = [
   "derive",
   "alloc",
 ] }
-serde-json-wasm = { version = "0.5.0" }
+serde-json-wasm = { version = "1.0.0" }
 thiserror = "1.0.26"
 bnum = "0.8.0"
 static_assertions = "1.1.0"