diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index f9ed23f..f67823d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -16,7 +16,7 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4
-      - uses: DeterminateSystems/nix-installer-action@v7
+      - uses: DeterminateSystems/nix-installer-action@v9
       - uses: DeterminateSystems/magic-nix-cache-action@v2
 
       # Evaluate the devshell here so that the time reported for subsequent
@@ -41,7 +41,7 @@ jobs:
 
     steps:
       - uses: actions/checkout@v4
-      - uses: DeterminateSystems/nix-installer-action@v7
+      - uses: DeterminateSystems/nix-installer-action@v9
       - uses: DeterminateSystems/magic-nix-cache-action@v2
 
       # Evaluate the devshell here so that the time reported for subsequent