diff --git a/dev-requirements.txt b/dev-requirements.txt
index 698c45b6..2f6ef892 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -18,7 +18,7 @@ coverage[toml]
 ruff ==0.3.4
 
 # typing
-mypy ==1.8.0
+mypy ==1.9.0
 lxml-stubs
 trio-typing
 types-freezegun