diff --git a/realvuln-repos/realvuln-vulnerable-flask-app/app/requirements.txt b/realvuln-repos/realvuln-vulnerable-flask-app/app/requirements.txt
index 4ad9eaf..11866bb 100644
--- a/realvuln-repos/realvuln-vulnerable-flask-app/app/requirements.txt
+++ b/realvuln-repos/realvuln-vulnerable-flask-app/app/requirements.txt
@@ -23,6 +23,6 @@ requests==2.18.1
 singledispatch==3.4.0.3
 six==1.10.0
 SQLAlchemy==1.1.11
-tornado==4.5.1
+tornado==6.5.5
 urllib3==1.21.1
 Werkzeug==0.14.1