diff --git a/.github/workflows/test-extensions.yml b/.github/workflows/test-extensions.yml
index 1ae5180..590aef4 100644
--- a/.github/workflows/test-extensions.yml
+++ b/.github/workflows/test-extensions.yml
@@ -71,6 +71,7 @@ jobs:
           - alpine3.10
           - alpine3.11
           - alpine3.12
+          - alpine3.13
           - jessie
           - stretch
           - buster