diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 5be4297c..2084d6b8 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -34,6 +34,7 @@ jobs:
     strategy:
       matrix:
         build_config:
+          - { version: 21 }
           - { version: 20 }
           - { version: 19 }
           - { version: 18 }