diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
new file mode 100644
index 00000000..88ade873
--- /dev/null
+++ b/.github/workflows/CI.yml
@@ -0,0 +1,25 @@
+name: CI
+
+on:
+  pull_request:
+    branches: [ develop ]
+
+jobs:
+  # macos:
+  #   runs-on: macos-latest
+  #   steps:
+  #   - uses: actions/checkout@v3
+  #   - name: Build
+  #     run: swift build -v
+  #   - name: Tests
+  #     run: swift test -v
+  linux:
+    runs-on: ubuntu-latest
+    container:
+      image: swift:latest
+    steps:
+    - uses: actions/checkout@v3
+    - name: Build
+      run: swift build -v
+    - name: Tests
+      run: swift test -v
\ No newline at end of file
diff --git a/.github/workflows/swift.yml b/.github/workflows/swift.yml
deleted file mode 100644
index a9c0c81c..00000000
--- a/.github/workflows/swift.yml
+++ /dev/null
@@ -1,19 +0,0 @@
-name: Swift
-
-on:
-  push:
-    branches: [ develop ]
-  pull_request:
-    branches: [ develop ]
-
-jobs:
-  build:
-
-    runs-on: macos-latest
-
-    steps:
-    - uses: actions/checkout@v3
-    - name: Build
-      run: swift build -v
-    - name: Run tests
-      run: swift test -v
diff --git a/Package.resolved b/Package.resolved
index 309c126e..ebbd8518 100644
--- a/Package.resolved
+++ b/Package.resolved
@@ -19,6 +19,15 @@
           "version": "2.0.1"
         }
       },
+      {
+        "package": "OpenCombine",
+        "repositoryURL": "https://github.com/OpenCombine/OpenCombine.git",
+        "state": {
+          "branch": null,
+          "revision": "9cf67e363738dbab61b47fb5eaed78d3db31e5ee",
+          "version": "0.13.0"
+        }
+      },
       {
         "package": "secp256k1",
         "repositoryURL": "https://github.com/Boilertalk/secp256k1.swift",
diff --git a/Package.swift b/Package.swift
index 9639b587..b8242f12 100644
--- a/Package.swift
+++ b/Package.swift
@@ -13,35 +13,50 @@ let package = Package(
     dependencies: [
         .package(name: "BigInt", url: "https://github.com/attaswift/BigInt", from: "5.0.0"),
         .package(name: "GenericJSON", url: "https://github.com/zoul/generic-json-swift", from: "2.0.0"),
-        .package(name: "secp256k1", url: "https://github.com/Boilertalk/secp256k1.swift", from: "0.1.0")
+        .package(name: "secp256k1", url: "https://github.com/Boilertalk/secp256k1.swift", from: "0.1.0"),
+        .package(url: "https://github.com/OpenCombine/OpenCombine.git", from: "0.13.0")
     ],
     targets: [
-        .target(name: "web3",
-                dependencies:
-                    [.target(name: "keccaktiny"),
-                     .target(name: "aes"),
-                     .target(name: "Internal_CryptoSwift_PBDKF2"),
-                     "BigInt",
-                     "GenericJSON",
-                     "secp256k1"],
-                path: "web3swift/src"),
-        .target(name: "keccaktiny",
-                dependencies: [],
-                path: "web3swift/lib/keccak-tiny",
-                exclude: ["module.map"]),
-        .target(name: "aes",
-                dependencies: [],
-                path: "web3swift/lib/aes",
-                exclude: ["module.map"]),
-        .target(name: "Internal_CryptoSwift_PBDKF2",
-                dependencies: [],
-                path: "web3swift/lib/CryptoSwift"),
-        .testTarget(name: "web3swiftTests",
-                    dependencies: ["web3"],
-                    path: "web3sTests",
-                    resources: [
-                        .copy("Resources/rlptests.json"),
-                        .copy("Account/cryptofights_712.json")
-                    ]),
+        .target(
+            name: "web3",
+            dependencies:
+                [
+                    .target(name: "keccaktiny"),
+                    .target(name: "aes"),
+                    .target(name: "Internal_CryptoSwift_PBDKF2"),
+                    "BigInt",
+                    "GenericJSON",
+                    "secp256k1",
+                    .product(name: "OpenCombine", package: "OpenCombine"),
+                    .product(name: "OpenCombineFoundation", package: "OpenCombine")
+                ],
+            path: "web3swift/src"
+        ),
+        .target(
+            name: "keccaktiny",
+            dependencies: [],
+            path: "web3swift/lib/keccak-tiny",
+            exclude: ["module.map"]
+        ),
+        .target(
+            name: "aes",
+            dependencies: [],
+            path: "web3swift/lib/aes",
+            exclude: ["module.map"]
+        ),
+        .target(
+            name: "Internal_CryptoSwift_PBDKF2",
+            dependencies: [],
+            path: "web3swift/lib/CryptoSwift"
+        ),
+        .testTarget(
+            name: "web3swiftTests",
+            dependencies: ["web3"],
+            path: "web3sTests",
+            resources: [
+                .copy("Resources/rlptests.json"),
+                .copy("Account/cryptofights_712.json")
+            ]
+        ),
     ]
 )
diff --git a/web3swift/src/Client/EthereumClient+Call.swift b/web3swift/src/Client/EthereumClient+Call.swift
index a14e2644..2d472afd 100644
--- a/web3swift/src/Client/EthereumClient+Call.swift
+++ b/web3swift/src/Client/EthereumClient+Call.swift
@@ -7,7 +7,11 @@
 //
 
 import Foundation
+#if canImport(Combine)
 import Combine
+#else
+import OpenCombine
+#endif
 
 public enum OffchainReadError: Error {
     case network