diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 2a8b312..92c1208 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -9,7 +9,6 @@ jobs:
     strategy:
       matrix:
         tag:
-          - nixos-20.09
           - nixos-21.05
           - nixos-21.11
           - nixos-unstable