diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 82313f4..386be83 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -25,7 +25,7 @@ jobs:
 
     steps:
       - uses: actions/checkout@v6
-      - uses: DeterminateSystems/nix-installer-action@v20
+      - uses: DeterminateSystems/nix-installer-action@v21
         with:
           diagnostic-endpoint: ''
 
@@ -49,7 +49,7 @@ jobs:
 
     steps:
       - uses: actions/checkout@v6
-      - uses: DeterminateSystems/nix-installer-action@v20
+      - uses: DeterminateSystems/nix-installer-action@v21
         with:
           diagnostic-endpoint: ''