diff --git a/build-constraints.yaml b/build-constraints.yaml
index 5c9b5636..08faba25 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -4339,6 +4339,8 @@ packages:
         - web-plugins < 0
         - modern-uri < 0
         - stache < 0
+        - persistent-refs < 0
+
 
     "GHC upper bounds":
         # Need to always match the version shipped with GHC
@@ -4384,7 +4386,7 @@ packages:
         - QuickCheck < 2.12
         - hspec < 2.5.6
         - hspec-core < 2.5.6
-        # hspec-discover < 2.5.6
+        - hspec-discover < 2.5.6
         - hspec-meta < 2.5.6
 
         # https://github.com/commercialhaskell/stackage/issues/3950