diff --git a/.github/workflows/docs.yml b/.github/workflows/docs.yml
index 4a9e574..3b90d5b 100644
--- a/.github/workflows/docs.yml
+++ b/.github/workflows/docs.yml
@@ -29,7 +29,8 @@
           "name": "Setup Common Lisp Environment",
           "uses": "40ants/setup-lisp@v1",
           "with": {
-            "asdf-system": "project-docs"
+            "asdf-system": "project-docs",
+            "asdf-version": "3.3.5.1"
           }
         },
         {
diff --git a/ci.lisp b/ci.lisp
index 8d1ebb0..5987de7 100644
--- a/ci.lisp
+++ b/ci.lisp
@@ -9,4 +9,5 @@
 (defworkflow docs
   :on-push-to "master"
   :by-cron "0 10 * * 1"
-  :jobs ((40ants-ci/jobs/docs:build-docs)))
+  :jobs ((40ants-ci/jobs/docs:build-docs
+          :asdf-version "3.3.5.1")))