diff --git a/CHANGES.rst b/CHANGES.rst
index 1105225..1c40685 100644
--- a/CHANGES.rst
+++ b/CHANGES.rst
@@ -5,6 +5,7 @@ Changelog
 -------------------
 * Drop EOL Python 3.6 and 3.7 support
 * Add Python 3.11 support
+* Remove mypy_extensions dependency
 
 0.9.3 (2022-10-11)
 ------------------
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