diff --git a/requirements.txt b/requirements.txt
index 9143252..f3f5230 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1 +1 @@
-tornado==4.3
\ No newline at end of file
+tornado==6.3.3
\ No newline at end of file
diff --git a/setup.py b/setup.py
index e799091..e50d159 100644
--- a/setup.py
+++ b/setup.py
@@ -41,7 +41,7 @@ def print1():
       zip_safe=False,
       install_requires=[
           # -*- Extra requirements: -*-
-          'tornado==4.0'
+          'tornado==6.3.3'
       ],
       entry_points="""
       # -*- Entry points: -*-