diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index cc11a226..efb2a9c0 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -74,7 +74,7 @@ jobs:
                   cachix use nix-community
 
             - name: Restore and cache Nix store
-              uses: nix-community/cache-nix-action@v5
+              uses: nix-community/cache-nix-action@v5.1.0
               with:
                 # restore and save a cache using this key
                 primary-key: nix-${{ runner.os }}-${{ hashFiles('**/*.nix', '**/.lock') }}
@@ -199,7 +199,7 @@ jobs:
                   cachix use nix-community
 
             - name: Restore and cache Nix store
-              uses: nix-community/cache-nix-action@v5
+              uses: nix-community/cache-nix-action@v5.1.0
               with:
                 # restore and save a cache using this key
                 primary-key: nix-${{ runner.os }}-${{ matrix.target }}-${{ hashFiles('**/*.nix', '**/.lock') }}
diff --git a/.github/workflows/documentation.yml b/.github/workflows/documentation.yml
index 9051d048..9beb5064 100644
--- a/.github/workflows/documentation.yml
+++ b/.github/workflows/documentation.yml
@@ -60,7 +60,7 @@ jobs:
             cachix use nix-community
 
       - name: Restore and cache Nix store
-        uses: nix-community/cache-nix-action@v5
+        uses: nix-community/cache-nix-action@v5.1.0
         with:
           # restore and save a cache using this key
           primary-key: nix-${{ runner.os }}-${{ hashFiles('**/*.nix', '**/.lock') }}