diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 80e5b79..0e12cf1 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -13,6 +13,7 @@ jobs:
       matrix:
         os:
           - ubuntu-18.04
+          - ubuntu-20.04
           - ubuntu-latest
         fish:
           - stock