diff --git a/build-constraints.yaml b/build-constraints.yaml
index d2f25daa..b6459d22 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -7822,6 +7822,10 @@ packages:
 
         # https://github.com/commercialhaskell/stackage/issues/6910
         - bifunctors < 5.6
+
+        # https://github.com/commercialhaskell/stackage/issues/6911
+        - ghc-lib-parser < 9.6
+        - ghc-lib-parser-ex < 9.6
 # end of packages
 
 # Package flags are applied to individual packages, and override the values of