diff --git a/build-constraints.yaml b/build-constraints.yaml
index 7e5f49e6..71ac9513 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -1239,7 +1239,7 @@ packages:
         - dhall-bash < 1.0.38 # https://github.com/commercialhaskell/stackage/issues/6175
         - dhall-json < 1.7.8 # https://github.com/commercialhaskell/stackage/issues/6175
         - dhall-lsp-server
-        - dhall-yaml
+        - dhall-yaml < 1.2.8 # https://github.com/commercialhaskell/stackage/issues/6175
         - aeson-yaml  # req'd by dhall-json
         - dhall-nix
         - nix-derivation