diff --git a/build-constraints.yaml b/build-constraints.yaml
index c8e619c6..5fa3ab86 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1391,6 +1391,11 @@ packages:
     "Stefan Berthold":
         - smallcaps
 
+    "Gregory Collins <greg@gregorycollins.net>":
+        - hashtables
+        - io-streams
+        - openssl-streams
+        
     "Stackage upper bounds":
         # https://github.com/fpco/stackage/issues/537
         - zlib < 0.6