diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 1a55ca7f3..742ae8318 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -144,7 +144,7 @@ jobs:
             .sources
           key: fonts-${{ hashFiles('Makefile-fonts') }}
       - name: Install Nix
-        uses: DeterminateSystems/nix-installer-action@v14
+        uses: DeterminateSystems/nix-installer-action@v15
       - name: Cache Nix dependencies
         uses: DeterminateSystems/magic-nix-cache-action@v8
       - name: Setup developer environment
diff --git a/.github/workflows/nix.yml b/.github/workflows/nix.yml
index cd1508dc2..b3c0e2c2d 100644
--- a/.github/workflows/nix.yml
+++ b/.github/workflows/nix.yml
@@ -16,7 +16,7 @@ jobs:
         with:
           fetch-depth: 0
       - name: Install Nix
-        uses: DeterminateSystems/nix-installer-action@v14
+        uses: DeterminateSystems/nix-installer-action@v15
       - name: Cache Nix dependencies
         uses: DeterminateSystems/magic-nix-cache-action@v8
       # Upstream package sometimes has flags set that disable flake checking