diff --git a/requirements/dev.txt b/requirements/dev.txt
index 001ad3e0a..adcb59888 100644
--- a/requirements/dev.txt
+++ b/requirements/dev.txt
@@ -1,7 +1,7 @@
 # development dependencies (see docs.txt for documentation building dependencies)
 # linting and static type-checking
 flake8>=3.7.7, <7.0.0
-mypy~=1.0
+mypy>=1.0, <2.0
 types-requests>=2.25, <3.0
 types-toml>=0.10, <1.0
 # testing