diff --git a/.github/workflows/release-tip.yml b/.github/workflows/release-tip.yml
index 86d45059a..9db0ac0f8 100644
--- a/.github/workflows/release-tip.yml
+++ b/.github/workflows/release-tip.yml
@@ -23,7 +23,7 @@ jobs:
         fetch-depth: 0
 
     # Install Nix and use that so our environment matches exactly.
-    - uses: cachix/install-nix-action@v18
+    - uses: cachix/install-nix-action@v19
       with:
         nix_path: nixpkgs=channel:nixos-unstable
 
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index a769db39d..7de0030c7 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -31,7 +31,7 @@ jobs:
         fetch-depth: 0
 
     # Install Nix and use that to run our tests so our environment matches exactly.
-    - uses: cachix/install-nix-action@v18
+    - uses: cachix/install-nix-action@v19
       with:
         nix_path: nixpkgs=channel:nixos-unstable
 
@@ -53,7 +53,7 @@ jobs:
         fetch-depth: 0
 
     # Install Nix and use that to run our tests so our environment matches exactly.
-    - uses: cachix/install-nix-action@v18
+    - uses: cachix/install-nix-action@v19
       with:
         nix_path: nixpkgs=channel:nixos-unstable