diff --git a/.github/workflows/flake-health-checks.yml b/.github/workflows/flake-health-checks.yml
index b8eb3fd..123f5cb 100644
--- a/.github/workflows/flake-health-checks.yml
+++ b/.github/workflows/flake-health-checks.yml
@@ -5,6 +5,9 @@ on:
     pull_request:
         branches: ["main"]
     merge_group:
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
 jobs:
     health-check:
         name: "Perform Nix flake checks"
diff --git a/.github/workflows/flake-update.yml b/.github/workflows/flake-update.yml
index 7a98f13..acb55b7 100644
--- a/.github/workflows/flake-update.yml
+++ b/.github/workflows/flake-update.yml
@@ -4,6 +4,9 @@ on:
     workflow_dispatch:
     schedule:
         - cron: "00 12 * * *"
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
 jobs:
     update_lockfile:
         runs-on: ubuntu-latest
diff --git a/.github/workflows/lock-health-checks.yml b/.github/workflows/lock-health-checks.yml
index 38734e2..f27e0a3 100644
--- a/.github/workflows/lock-health-checks.yml
+++ b/.github/workflows/lock-health-checks.yml
@@ -5,6 +5,9 @@ on:
     pull_request:
         branches: ["main"]
     merge_group:
+concurrency:
+  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
+  cancel-in-progress: true
 jobs:
     health-check:
         name: "Check health of `flake.lock`"