diff --git a/requirements.txt b/requirements.txt
index fae4206..7cdd255 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -8,6 +8,5 @@ structlog>=18.1.0
 blinker>=1.4
 pyjwt>=1.4.0
 six>=1.10.0
-mypy-extensions>=0.4.3
 stix2>=3.0.1
 marshmallow>=3.10.0