diff --git a/action.yml b/action.yml
index ee09f45..64f360d 100644
--- a/action.yml
+++ b/action.yml
@@ -144,7 +144,7 @@ runs:
 
     - name: Install nix
       if: inputs.skip-nix-installation == 'false'
-      uses: DeterminateSystems/nix-installer-action@786fff0690178f1234e4e1fe9b536e94f5433196  # v20
+      uses: DeterminateSystems/nix-installer-action@c5a866b6ab867e88becbed4467b93592bce69f8a  # v21
       with:
         logger: pretty
         extra-conf: experimental-features = ca-derivations fetch-closure