diff --git a/build-constraints.yaml b/build-constraints.yaml
index 1a737ced..bdd3fc0c 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3528,6 +3528,9 @@ packages:
         - hledger-web < 1.9.2
         - hledger-api < 1.9.1
         - hledger-interest < 1.5.2
+
+        # https://github.com/commercialhaskell/stackage/issues/3728
+        - aeson < 1.4
 # end of packages
 
 # Package flags are applied to individual packages, and override the values of