diff --git a/build-constraints.yaml b/build-constraints.yaml
index f8fbbee5..87f2e0aa 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3233,6 +3233,8 @@ packages:
 
         # https://github.com/jaspervdj/hakyll/issues/540
         - hakyll < 4.9.5.1
+        - blaze-html < 0.9
+        - blaze-markup < 0.8
 
 # end of packages