diff --git a/build-constraints.yaml b/build-constraints.yaml
index 29db0394..88e63e62 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3187,34 +3187,34 @@ packages:
         # - gym-http-api # https://github.com/fpco/stackage/issues/3354
 
     "Tom Sydney Kerckhove <syd.kerckhove@gmail.com> @NorfairKing":
-        - genvalidity < 0 # GHC 8.4 via validity
-        - genvalidity-aeson < 0 # GHC 8.4 via hspec-2.5.0
-        - genvalidity-bytestring < 0 # GHC 8.4 via genvalidity-hspec
-        - genvalidity-containers < 0 # GHC 8.4 via hspec-2.5.0
-        - genvalidity-hspec < 0 # GHC 8.4 via hspec-2.5.0
-        - genvalidity-hspec-aeson < 0 # GHC 8.4 via genvalidity-hspec
-        - genvalidity-hspec-binary < 0 # GHC 8.4 via genvalidity-hspec
-        - genvalidity-hspec-cereal < 0 # GHC 8.4 via genvalidity-hspec
-        - genvalidity-hspec-hashable < 0 # GHC 8.4 via hspec-2.5.0
-        - genvalidity-path < 0 # GHC 8.4 via genvalidity-hspec
-        - genvalidity-property < 0 # GHC 8.4 via hspec-2.5.0
-        - genvalidity-scientific < 0 # GHC 8.4 via genvalidity-hspec
-        - genvalidity-text < 0 # GHC 8.4 via genvalidity-hspec
-        - genvalidity-time < 0 # GHC 8.4 via genvalidity-hspec
-        - genvalidity-unordered-containers < 0 # GHC 8.4 via hspec-2.5.0
-        - genvalidity-uuid < 0 # GHC 8.4 via genvalidity-hspec
-        - genvalidity-vector < 0 # GHC 8.4 via hspec-2.5.0
-        - validity < 0 # build failure with GHC 8.4
-        - validity-aeson < 0 # GHC 8.4 via validity
-        - validity-bytestring < 0 # build failure with GHC 8.4
-        - validity-containers < 0 # build failure with GHC 8.4
-        - validity-path < 0 # GHC 8.4 via validity
-        - validity-scientific < 0 # GHC 8.4 via validity
-        - validity-text < 0 # build failure with GHC 8.4
-        - validity-time < 0 # build failure with GHC 8.4
-        - validity-unordered-containers < 0 # GHC 8.4 via validity
+        - genvalidity
+        - genvalidity-aeson
+        - genvalidity-bytestring
+        - genvalidity-containers
+        - genvalidity-hspec
+        - genvalidity-hspec-aeson
+        - genvalidity-hspec-binary
+        - genvalidity-hspec-cereal
+        - genvalidity-hspec-hashable
+        - genvalidity-path
+        - genvalidity-property
+        - genvalidity-scientific
+        - genvalidity-text
+        - genvalidity-time
+        - genvalidity-unordered-containers
+        - genvalidity-uuid < 0 # GHC 8.4 via validity-uuid and uuid
+        - genvalidity-vector
+        - validity
+        - validity-aeson
+        - validity-bytestring
+        - validity-containers
+        - validity-path
+        - validity-scientific
+        - validity-text
+        - validity-time
+        - validity-unordered-containers
         - validity-uuid < 0 # GHC 8.4 via uuid
-        - validity-vector < 0 # GHC 8.4 via validity
+        - validity-vector
 
     "Henry Laxen <nadine.and.henry@pobox.com> @HenryLaxen":
         - bbdb