diff --git a/build-constraints.yaml b/build-constraints.yaml
index c92f2972..3682dcee 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -824,7 +824,7 @@ packages:
         - cryptonite-conduit
         - streaming-commons
 
-        - alex < 3.2.7 || > 3.2.7
+        - alex > 3.2.7 && < 3.3.0.0     # https://github.com/commercialhaskell/stackage/issues/6989
         - async
         - base16-bytestring
         - csv-conduit