diff --git a/build-constraints.yaml b/build-constraints.yaml
index 5b8a6340..0e1be59f 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3798,6 +3798,7 @@ expected-test-failures:
     - distributed-process-supervisor # # https://github.com/haskell-d
     - ghcid # Weird conflicts with sandboxingistributed/distributed-process-supervisor/issues/1
     - haskell-docs # GHC bug
+    - heist # not updated to pandoc 2, see https://github.com/snapframework/heist/pull/111
     - rattletrap # OOM? https://github.com/fpco/stackage/issues/2232
     - stm-delay # https://github.com/joeyadams/haskell-stm-delay/issues/5
     - pg-transact # https://github.com/jfischoff/pg-transact/issues/2