diff --git a/test-requirements.txt b/test-requirements.txt
index f1bcf2e..1a7354a 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -76,7 +76,7 @@ matplotlib-inline==0.1.6
     # via ipython
 mccabe==0.7.0
     # via flake8
-mypy==1.8.0
+mypy==1.9.0
     # via -r test-requirements.in
 mypy-extensions==1.0.0
     # via