diff --git a/build-constraints.yaml b/build-constraints.yaml
index 8fa5750b..7d3749c5 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1259,7 +1259,7 @@ packages:
         - bloodhound
 
     "Adam Bergmark <adam@bergmark.nl> @bergmark":
-        - aeson
+        - aeson < 2.0.0.0 # https://github.com/commercialhaskell/stackage/issues/6217
         - HUnit
         - attoparsec-iso8601
         - feed