diff --git a/build-constraints.yaml b/build-constraints.yaml
index 97a8ce15..5b80c814 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -5037,6 +5037,19 @@ packages:
         # Need to always match the version shipped with GHC
         - Win32 == 2.6.1.0
 
+    "Broken with GHC 9.0.1":
+      - Agda < 0
+      - cabal-rpm < 0
+      - entropy < 0
+      - fixed-vector-hetero < 0
+      - lens < 0
+      - packdeps < 0
+      - pantry < 0
+      - proto-lens-setup < 0
+      - servant-openapi < 0
+      - servant-swagger < 0
+      - singletons < 0
+
     "Stackage upper bounds":
       # https://github.com/commercialhaskell/stackage/issues/5570 1.3
       # https://github.com/commercialhaskell/stackage/issues/5795 1.4