diff --git a/container_a/requirements.txt b/container_a/requirements.txt
index 04dc0d8..b0f7399 100644
--- a/container_a/requirements.txt
+++ b/container_a/requirements.txt
@@ -8,4 +8,4 @@ Jinja2==2.9.6
 MarkupSafe==1.0
 requests==2.18.1
 urllib3==1.21.1
-Werkzeug==0.12.2
+Werkzeug==0.15.3
diff --git a/container_b/requirements.txt b/container_b/requirements.txt
index 04dc0d8..b0f7399 100644
--- a/container_b/requirements.txt
+++ b/container_b/requirements.txt
@@ -8,4 +8,4 @@ Jinja2==2.9.6
 MarkupSafe==1.0
 requests==2.18.1
 urllib3==1.21.1
-Werkzeug==0.12.2
+Werkzeug==0.15.3
diff --git a/requirements.txt b/requirements.txt
index e6fbb3a..8bf4dd2 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -24,4 +24,4 @@ traitlets==4.3.2
 urllib3==1.21.1
 wcwidth==0.1.7
 websocket-client==0.44.0
-Werkzeug==0.12.2
+Werkzeug==0.15.3