diff --git a/container_a/requirements.txt b/container_a/requirements.txt
index 04dc0d8..1e63303 100644
--- a/container_a/requirements.txt
+++ b/container_a/requirements.txt
@@ -4,7 +4,7 @@ click==6.7
 Flask==0.12.2
 idna==2.5
 itsdangerous==0.24
-Jinja2==2.9.6
+Jinja2==2.11.3
 MarkupSafe==1.0
 requests==2.18.1
 urllib3==1.21.1
diff --git a/container_b/requirements.txt b/container_b/requirements.txt
index 04dc0d8..1e63303 100644
--- a/container_b/requirements.txt
+++ b/container_b/requirements.txt
@@ -4,7 +4,7 @@ click==6.7
 Flask==0.12.2
 idna==2.5
 itsdangerous==0.24
-Jinja2==2.9.6
+Jinja2==2.11.3
 MarkupSafe==1.0
 requests==2.18.1
 urllib3==1.21.1
diff --git a/requirements.txt b/requirements.txt
index e6fbb3a..7e75065 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -10,7 +10,7 @@ ipython==6.1.0
 ipython-genutils==0.2.0
 itsdangerous==0.24
 jedi==0.10.2
-Jinja2==2.9.6
+Jinja2==2.11.3
 MarkupSafe==1.0
 pexpect==4.2.1
 pickleshare==0.7.4