diff --git a/.github/workflows/build-ffi.yml b/.github/workflows/build-ffi.yml
index 04497d61..f0f1e47a 100644
--- a/.github/workflows/build-ffi.yml
+++ b/.github/workflows/build-ffi.yml
@@ -1,6 +1,16 @@
 name: Pact-Rust FFI Build
 
-on: [push, pull_request]
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref || github.run_id }}
+  cancel-in-progress: true
 
 jobs:
   build:
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 2c41762c..48e982e0 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -1,6 +1,16 @@
 name: Pact-Rust Build
 
-on: [push, pull_request]
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref || github.run_id }}
+  cancel-in-progress: true
 
 jobs:
   build:
@@ -55,4 +65,3 @@ jobs:
       - uses: actions/checkout@v3
       - run: cargo check --no-default-features
         working-directory: rust
-         
diff --git a/.github/workflows/compatability-suite.yml b/.github/workflows/compatability-suite.yml
index b2a03729..832c9358 100644
--- a/.github/workflows/compatability-suite.yml
+++ b/.github/workflows/compatability-suite.yml
@@ -1,6 +1,16 @@
 name: Pact-Rust Compatibility Suite
 
-on: [push, pull_request]
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    branches:
+      - master
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref || github.run_id }}
+  cancel-in-progress: true
 
 env:
   pact_do_not_track: true