diff --git a/build-constraints.yaml b/build-constraints.yaml
index 2832d587..c5f418bf 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1827,9 +1827,6 @@ packages:
         - hse-cpp
 
     "Stackage upper bounds":
-        # https://github.com/fpco/stackage/issues/537
-        - zlib < 0.6
-
         # https://github.com/joelwilliamson/bimap/pull/4
         - bimap < 0.3.1