diff --git a/build-constraints.yaml b/build-constraints.yaml
index 4591b9f3..17568f37 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -5250,7 +5250,7 @@ packages:
         - MultipletCombiner
 
     "Kazu Yamamoto <kazu@iij.ad.jp> @kazu-yamamoto":
-        - crypton
+        - crypton < 0.34        # https://github.com/commercialhaskell/stackage/issues/7175
         - crypton-connection
         - crypton-x509
         - crypton-x509-store