diff --git a/.github/workflows/build_dragonflybsd.yml b/.github/workflows/build_dragonflybsd.yml
index 4ef99b5..deeca67 100644
--- a/.github/workflows/build_dragonflybsd.yml
+++ b/.github/workflows/build_dragonflybsd.yml
@@ -8,6 +8,10 @@ on:
     branches:
       - '*'
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   build_dragonflybsd:
     name: Build on ${{ matrix.box }}
diff --git a/.github/workflows/build_freebsd.yml b/.github/workflows/build_freebsd.yml
index 95baa90..c8c9c7f 100644
--- a/.github/workflows/build_freebsd.yml
+++ b/.github/workflows/build_freebsd.yml
@@ -8,6 +8,10 @@ on:
     branches:
       - '*'
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   build_freebsd:
     name: Build on ${{ matrix.box }}
diff --git a/.github/workflows/build_linux.yml b/.github/workflows/build_linux.yml
index 2bec497..fbba018 100644
--- a/.github/workflows/build_linux.yml
+++ b/.github/workflows/build_linux.yml
@@ -8,6 +8,10 @@ on:
     branches:
       - '*'
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   build_linux:
     name: Build on ${{ matrix.os }}
diff --git a/.github/workflows/build_macos.yml b/.github/workflows/build_macos.yml
index 6ef1f6f..71f185a 100644
--- a/.github/workflows/build_macos.yml
+++ b/.github/workflows/build_macos.yml
@@ -8,6 +8,10 @@ on:
     branches:
       - '*'
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   build_macos:
     name: Build on ${{ matrix.os.name }}
diff --git a/.github/workflows/build_netbsd.yml b/.github/workflows/build_netbsd.yml
index be88feb..25bfed4 100644
--- a/.github/workflows/build_netbsd.yml
+++ b/.github/workflows/build_netbsd.yml
@@ -8,6 +8,10 @@ on:
     branches:
       - '*'
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   build_netbsd:
     name: Build on ${{ matrix.box }}
diff --git a/.github/workflows/build_openbsd.yml b/.github/workflows/build_openbsd.yml
index 8bac8a1..55784e7 100644
--- a/.github/workflows/build_openbsd.yml
+++ b/.github/workflows/build_openbsd.yml
@@ -8,6 +8,10 @@ on:
     branches:
       - '*'
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   build_openbsd:
     name: Build on ${{ matrix.box }}
diff --git a/.github/workflows/build_windows.yml b/.github/workflows/build_windows.yml
index 63cdb56..a3d7e34 100644
--- a/.github/workflows/build_windows.yml
+++ b/.github/workflows/build_windows.yml
@@ -8,6 +8,10 @@ on:
     branches:
       - '*'
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
+
 jobs:
   build_win:
     name: Build on Windows ${{ matrix.platform.bitness }} as ${{ matrix.config }}