diff --git a/build-constraints.yaml b/build-constraints.yaml
index d5587ea5..9957cc9f 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1828,9 +1828,6 @@ 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