diff --git a/build-constraints.yaml b/build-constraints.yaml
index 63e1e2ab..f4988158 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3454,6 +3454,10 @@ packages:
 
         # https://github.com/fpco/stackage/issues/3346
         - haskell-tools-refactor < 1.0.1.1
+
+        # Requires too-new base
+        - xhtml < 3000.2.2.1 # base >= 4.11
+
 # end of packages
 
 # Package flags are applied to individual packages, and override the values of