diff --git a/build-constraints.yaml b/build-constraints.yaml
index fd83d51e..996eca7f 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -2846,7 +2846,7 @@ packages:
         - hedgehog-fakedata
         - persistent-discover
         - persistent-documentation
-        - persistent-typed-db < 0
+        - persistent-typed-db < 0 # https://github.com/commercialhaskell/stackage/issues/7722
         - persistent-qq
         - persistent-pagination
         - hspec-hedgehog
@@ -8819,6 +8819,7 @@ expected-test-failures:
     - opentelemetry-extra # 0.8.0 negative quickcheck resize
     - optics # 0.4.2.1
     - pcre-heavy
+    - persistent-mtl # cannot run tests with persistent > 2.14
     - pkgtreediff # 0.6.0
     - posix-paths
     - posix-pty # 0.2.2