diff --git a/build-constraints.yaml b/build-constraints.yaml
index fa15b2e9..b73ceee2 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -299,7 +299,7 @@ packages:
     "Phil de Joux <phil.dejoux@blockscope.com> @philderbeast":
         - siggy-chardust
         - detour-via-sci
-        - hpack-dhall
+        - hpack-dhall         < 0.5.7       # https://github.com/commercialhaskell/stackage/issues/6556
 
     "Matthew Ahrens <matt.p.ahrens@gmail.com> @mpahrens":
         - forkable-monad