diff --git a/build-constraints.yaml b/build-constraints.yaml
index 873b6423..0052bca7 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -4894,6 +4894,8 @@ packages:
       - megaparsec < 8
       - megaparsec-tests < 8
       - hspec-megaparsec < 2.1
+      - parser-combinators < 1.2.1
+      - parser-combinators-tests < 1.2.1
 
 # end of packages