diff --git a/Python_lib/boomerang/requirements.txt b/Python_lib/boomerang/requirements.txt
old mode 100755
new mode 100644
index 4a381c4..094d870
--- a/Python_lib/boomerang/requirements.txt
+++ b/Python_lib/boomerang/requirements.txt
@@ -38,7 +38,7 @@ snowballstemmer==1.2.1
 Sphinx==1.6.7
 sphinx-rtd-theme==0.2.4
 sphinxcontrib-websupport==1.0.1
-tornado==4.5.3
+tornado==6.5
 typed-ast==1.1.0
 urllib3==1.22
 wrapt==1.10.11