diff --git a/build-constraints.yaml b/build-constraints.yaml
index 0c399411..221ac1f8 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -7842,6 +7842,9 @@ packages:
         - hledger-lib < 1.42
         - hledger-ui < 1.42
         - hledger-web < 1.42
+
+        # https://github.com/commercialhaskell/stackage/issues/7709
+        - tls < 2.1.9
     # end of Stackage upper bounds
 # end of packages