diff --git a/requirements/common.txt b/requirements/common.txt
index 22a4725eed..eacbd3e052 100644
--- a/requirements/common.txt
+++ b/requirements/common.txt
@@ -142,7 +142,7 @@ sockjs-tornado==1.0.3
 sourcemap==0.2.1
 
 # Tornado used for server->client push system
-tornado==4.5.1
+tornado==4.5.2
 
 # Needed for Python static typing
 typing==3.6.2
diff --git a/requirements/dev_lock.txt b/requirements/dev_lock.txt
index 51e842673d..bc7c572df8 100644
--- a/requirements/dev_lock.txt
+++ b/requirements/dev_lock.txt
@@ -145,7 +145,7 @@ sphinxcontrib-websupport==1.0.1  # via sphinx
 sqlalchemy==1.1.14
 statsd==2.1.2             # via django-statsd-mozilla
 tblib==1.3.2
-tornado==4.5.1
+tornado==4.5.2
 traitlets==4.3.2          # via ipython
 transifex-client==0.12.4
 twisted==17.5.0
diff --git a/requirements/prod_lock.txt b/requirements/prod_lock.txt
index 6abf749b1f..f79b4cb296 100644
--- a/requirements/prod_lock.txt
+++ b/requirements/prod_lock.txt
@@ -102,7 +102,7 @@ sockjs-tornado==1.0.3
 sourcemap==0.2.1
 sqlalchemy==1.1.14
 statsd==2.1.2             # via django-statsd-mozilla
-tornado==4.5.1
+tornado==4.5.2
 traitlets==4.3.2          # via ipython
 typing==3.6.2
 uritemplate==3.0.0