diff --git a/X11-base.yaml b/X11-base.yaml
index 48470d1..ef413ad 100644
--- a/X11-base.yaml
+++ b/X11-base.yaml
@@ -11,8 +11,8 @@ data:
             bootstrap: master
         requires:
             platform: master
-            fonts: master
-            autotools: master
+            fonts: f27
+            autotools: f27
     references:
         community: https://github.com/modularity-modules/X11-base
         documentation: https://github.com/modularity-modules/X11-base