diff --git a/module/jobs/github-actions/default.nix b/module/jobs/github-actions/default.nix
index 7cadf91..1028ab6 100644
--- a/module/jobs/github-actions/default.nix
+++ b/module/jobs/github-actions/default.nix
@@ -17,6 +17,7 @@ in
         outputs.changes = "\${{ steps.diff.outputs.changes }}";
         runs-on = config.pipeline.github-actions.defaultRunsOn;
         steps = [
+          { uses = "actions/checkout@v4"; }
           {
             id = "diff";
             shell = "bash";
diff --git a/module/tests/github-actions/job.nix b/module/tests/github-actions/job.nix
index c5899a1..61572fe 100644
--- a/module/tests/github-actions/job.nix
+++ b/module/tests/github-actions/job.nix
@@ -142,6 +142,7 @@
           outputs.changes = "\${{ steps.diff.outputs.changes }}";
           runs-on = "ubuntu-latest";
           steps = [
+            { uses = "actions/checkout@v4"; }
             {
               id = "diff";
               shell = "bash";