diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c8f65a3f..9cd9146f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -29,6 +29,7 @@ jobs:
             pgfopts
             setspace
             xurl
+            microtype
       - name: document
         run: l3build doc
       - name: build