diff --git a/build-constraints.yaml b/build-constraints.yaml
index cfb3c7b1..fecc2029 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -2658,6 +2658,9 @@ packages:
         - diagrams < 1.4
         - diagrams-contrib < 1.4
 
+        # https://github.com/fpco/stackage/issues/2024
+        - megaparsec < 5.1
+
 # end of packages