diff --git a/build-constraints.yaml b/build-constraints.yaml
index 4f6a089d..22ebad2b 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -5317,7 +5317,7 @@ packages:
         - pantry
 
     "Torsten Schmits <stackage@schmits.me> @tek":
-        - exon
+        - exon < 1.7  # https://github.com/commercialhaskell/stackage/issues/7440
         - incipit-base
         - incipit-core
         - polysemy