diff --git a/build-constraints.yaml b/build-constraints.yaml
index beb8d03e..1fb5b4ad 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3995,7 +3995,7 @@ packages:
         - map-syntax < 0 # GHC 8.4 via base-4.11.0.0
         - heist < 0 # GHC 8.4 via map-syntax
         - snap < 0 # GHC 8.4 via base-4.11.0.0
-        - conferer
+        - conferer < 1.1
         #- conferer-snap # Because snap
         - conferer-warp
         - conferer-hspec