diff --git a/requirements-dev.txt b/requirements-dev.txt
index 57e311d5..8841157f 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -1,6 +1,7 @@
 tox>=3.14.3
 black>=19.10b0
 isort>=4.3.21
+mypy>=0.761
 pytest>=5.3.4
 pytest-cov>=2.8.1
 pyfakefs>=3.7.1