diff --git a/.github/actions/setup-nix/action.yml b/.github/actions/setup-nix/action.yml
index f62076a..ca23537 100644
--- a/.github/actions/setup-nix/action.yml
+++ b/.github/actions/setup-nix/action.yml
@@ -34,7 +34,7 @@ runs:
       uses: DeterminateSystems/nix-installer-action@main
 
     - name: Cache Nix store
-      uses: nix-community/cache-nix-action@v6
+      uses: nix-community/cache-nix-action@v7
       with:
         # Key on the lockfile + all Nix sources; restore the most recent
         # arch-matching cache otherwise.
diff --git a/.github/workflows/fmt.yml b/.github/workflows/fmt.yml
index 931910e..06624e6 100644
--- a/.github/workflows/fmt.yml
+++ b/.github/workflows/fmt.yml
@@ -38,7 +38,7 @@ jobs:
         uses: DeterminateSystems/nix-installer-action@main
 
       - name: Cache Nix store
-        uses: nix-community/cache-nix-action@v6
+        uses: nix-community/cache-nix-action@v7
         with:
           # Formatting/linting tools (treefmt, statix, …) come from the flake;
           # key on the lockfile + Nix sources so the tool closure is reused.
@@ -62,7 +62,7 @@ jobs:
         uses: DeterminateSystems/nix-installer-action@main
 
       - name: Cache Nix store
-        uses: nix-community/cache-nix-action@v6
+        uses: nix-community/cache-nix-action@v7
         with:
           # Same tool closure as the format job; key on the lockfile + Nix
           # sources so it is reused across runs.