diff --git a/requirements-dev.in b/requirements-dev.in
index d354527..556a3c3 100644
--- a/requirements-dev.in
+++ b/requirements-dev.in
@@ -1,7 +1,7 @@
 -r requirements.txt
 black~=24.2
 isort~=5.13
-mypy~=1.8
+mypy~=1.9
 pytest-datafiles~=3.0
 pytest~=8.1
 types-PyYAML~=6.0
diff --git a/requirements-dev.txt b/requirements-dev.txt
index 285195b..dfc3aac 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -21,7 +21,7 @@ jsonschema-specifications==2023.12.1
     # via
     #   -r requirements.txt
     #   jsonschema
-mypy==1.8.0
+mypy==1.9.0
     # via -r requirements-dev.in
 mypy-extensions==1.0.0
     # via