diff --git a/build-constraints.yaml b/build-constraints.yaml
index 119864b8..a13b3be9 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3445,6 +3445,10 @@ packages:
         # (build failure)
         - groundhog-postgresql < 0.8.0.2
 
+        # https://github.com/RyanGlScott/text-show/issues/34
+        # (downstream build failure)
+        - quickcheck-instances < 0.3.17
+
 # end of packages
 
 # Package flags are applied to individual packages, and override the values of