diff --git a/build-constraints.yaml b/build-constraints.yaml
index bc4d3de6..e0a9b948 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -6695,6 +6695,10 @@ packages:
       # https://github.com/commercialhaskell/stackage/issues/6107
       - generic-random < 1.5.0.0
 
+      # https://github.com/commercialhaskell/stackage/issues/6116
+      - megaparsec < 9.1
+      - megaparsec-tests < 9.1
+
 # end of packages
 
 # Package flags are applied to individual packages, and override the values of