diff --git a/postorius/Dockerfile.dev b/postorius/Dockerfile.dev
index 13b0c42..479d9c4 100644
--- a/postorius/Dockerfile.dev
+++ b/postorius/Dockerfile.dev
@@ -26,7 +26,7 @@ RUN set -ex \
 		                psycopg2 \
 		                dj-database-url \
 		                mysqlclient \
-	&& pip install -U django>=1.11\
+	&& pip install -U django==2.1.5\
 	&& pip install -U git+https://gitlab.com/mailman/django-mailman3@${DJ_MM3_REF} \
 	&& apk del .build-deps \
 	&& addgroup -S mailman \