diff --git a/build-constraints.yaml b/build-constraints.yaml
index 3f709882..61f2119b 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -8532,6 +8532,10 @@ skipped-tests:
     - symengine
     - hasql-interpolate # https://github.com/commercialhaskell/stackage/issues/6841
 
+    # missing tools
+    - taffybar # The program 'hspec-discover' version >=2 && <3 is required but the version of .../9.12.2/bin/hspec-discover could not be determined.
+    - rank2classes # The program 'markdown-unlit' version >=0.5 && <0.7 is required but the version of .../9.12.2/bin/markdown-unlit could not be determined.
+
     # Timeouts
     # These tests sometimes take too long and hit the stackage build
     # servers time limit so these shouldn't be removed from