diff --git a/requirements.txt b/requirements.txt
index 58e679bd..660c124e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,7 +11,7 @@ mypy; python_version >= '3.6'
 nbconvert
 pytest
 pytest-cov
-pytest-mypy; python_version >= '3.6'
+pytest-mypy; python_version >= '3.5'
 setuptools_scm
 six>=1.14.0
 toml