diff --git a/build-constraints.yaml b/build-constraints.yaml
index 60ebc821..2259870a 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -4473,7 +4473,7 @@ packages:
         - process-extras
         - product-isomorphic
         - project-template
-        - protobuf < 0 # via hex
+        - protobuf
         - pureMD5
         - quickcheck-instances
         - quickcheck-io
@@ -5022,6 +5022,7 @@ skipped-tests:
     - mmtf # via hspec-2.7.0
     - next-ref # hspec 2.3
     - partial-order # HUnit 1.6
+    - protobuf # hex-0.1.2
     - psqueues # via QuickCheck-2.12.6.1
     - pure-zlib # via QuickCheck-2.12.6.1
     - records-sop # via hspec-2.7.0