diff --git a/build-constraints.yaml b/build-constraints.yaml
index 19162ee3..422bd0c5 100644
--- a/build-constraints.yaml
+++ b/build-constraints.yaml
@@ -3171,6 +3171,9 @@ packages:
         # https://github.com/fpco/stackage/issues/2516
         - ghc-typelits-knownnat <0.3
 
+        # https://github.com/fpco/stackage/issues/2365
+        - matplotlib < 0.4.1 # still an issue with 0.4.5
+
 # end of packages
 
 # Package flags are applied to individual packages, and override the values of