diff --git a/dev-requirements.txt b/dev-requirements.txt
index 1c0d784..77bd6fb 100644
--- a/dev-requirements.txt
+++ b/dev-requirements.txt
@@ -1,6 +1,6 @@
 autopep8
 coverage
-mypy
+mypy==1.5.0
 pdoc3
 pylint==2.17.5
 setuptools