diff --git a/Cargo.lock b/Cargo.lock
index b30e22da..d63a350e 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -988,9 +988,9 @@ dependencies = [
 
 [[package]]
 name = "multimap"
-version = "0.9.1"
+version = "0.10.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "e1a5d38b9b352dbd913288736af36af41c48d61b1a8cd34bcecd727561b7d511"
+checksum = "defc4c55412d89136f966bbb339008b474350e5e6e78d2714439c386b3137a03"
 dependencies = [
  "serde",
 ]
diff --git a/crates/diagnostics/Cargo.toml b/crates/diagnostics/Cargo.toml
index 1fb4b217..94fc310a 100644
--- a/crates/diagnostics/Cargo.toml
+++ b/crates/diagnostics/Cargo.toml
@@ -15,7 +15,7 @@ encoding_rs_io = "0.1.7"
 itertools = "0.12.0"
 line-index = { path = "../line-index" }
 log = "0.4.20"
-multimap = "0.9.1"
+multimap = "0.10.0"
 once_cell = "1.19.0"
 parking_lot = "0.12.1"
 regex = "1.10.2"