diff --git a/.github/workflows/haskell.yml b/.github/workflows/haskell.yml
index d71fac4..eebf097 100644
--- a/.github/workflows/haskell.yml
+++ b/.github/workflows/haskell.yml
@@ -16,6 +16,9 @@ jobs:
       matrix:
         cabal: ["3.10"]
         ghc: ["8.8.4", "8.10.7", "9.0.2", "9.2.8", "9.4.6", "9.6.3"]
+    concurrency:
+      group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}-${{ matrix.cabal }}-${{matrix.ghc}}
+      cancel-in-progress: true
     env:
       CONFIG: "--enable-tests"
     steps:
diff --git a/.github/workflows/nix.yml b/.github/workflows/nix.yml
index 77fe7c6..963e5d7 100644
--- a/.github/workflows/nix.yml
+++ b/.github/workflows/nix.yml
@@ -20,6 +20,9 @@ jobs:
           - ghc92
           - ghc94
           - ghc96
+    concurrency:
+      group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}-${{ matrix.ghc }}
+      cancel-in-progress: true
     steps:
     - uses: actions/checkout@v3
     - uses: cachix/install-nix-action@v19