diff --git a/cms/envs/common.py b/cms/envs/common.py
index 96594e01c9..bf60eee34b 100644
--- a/cms/envs/common.py
+++ b/cms/envs/common.py
@@ -829,7 +829,6 @@ COURSES_WITH_UNSAFE_CODE = []
 DEBUG = False
 SESSION_COOKIE_SECURE = False
 SESSION_SAVE_EVERY_REQUEST = False
-SESSION_SERIALIZER = 'django.contrib.sessions.serializers.PickleSerializer'
 SESSION_COOKIE_DOMAIN = ""
 SESSION_COOKIE_NAME = 'sessionid'
 
diff --git a/lms/envs/common.py b/lms/envs/common.py
index a2a9a8249e..ef38521367 100644
--- a/lms/envs/common.py
+++ b/lms/envs/common.py
@@ -1101,7 +1101,6 @@ DEBUG = False
 USE_TZ = True
 SESSION_COOKIE_SECURE = False
 SESSION_SAVE_EVERY_REQUEST = False
-SESSION_SERIALIZER = 'django.contrib.sessions.serializers.PickleSerializer'
 SESSION_COOKIE_DOMAIN = ""
 SESSION_COOKIE_NAME = 'sessionid'