diff --git a/build-constraints.yaml b/build-constraints.yaml
index ecbf344c..a9313b17 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -2916,7 +2916,7 @@ packages:
         - tasty-focus
 
     "Spencer Janssen <spencerjanssen@gmail.com> @spencerjanssen":
-        - smtp-mail
+        - smtp-mail < 0.5.0.1 # https://github.com/commercialhaskell/stackage/issues/7963
         - Xauth
 
     "Sebastian de Bellefon <arnaudpourseb@gmail.com> @Helkafen":