diff --git a/build-constraints.yaml b/build-constraints.yaml
index b563d5b6..47eb3f9f 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3342,6 +3342,9 @@ packages:
         # https://github.com/fpco/stackage/issues/3264
         - yesod-test < 1.6.0
 
+        # https://github.com/fpco/stackage/issues/3268
+        - async < 2.2
+
 # end of packages
 
 # Package flags are applied to individual packages, and override the values of