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diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index d6783830630df66fd5f390f6093ea5acf805be54..8c14c07baa0e7772f5a567d47648211e9e16b3cd 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -31,7 +31,7 @@           - <YOUR_CACHIX_NAME>
         nixPath:
           - nixpkgs=channel:nixos-unstable
           - nixpkgs=channel:nixpkgs-unstable
-          - nixpkgs=channel:nixos-20.09
+          - nixpkgs=channel:nixos-21.05
     runs-on: ubuntu-latest
     steps:
     - name: Checkout repository