diff --git a/container_a/requirements.txt b/container_a/requirements.txt
index 04dc0d8..71e1dbf 100644
--- a/container_a/requirements.txt
+++ b/container_a/requirements.txt
@@ -7,5 +7,5 @@ itsdangerous==0.24
 Jinja2==2.9.6
 MarkupSafe==1.0
 requests==2.18.1
-urllib3==1.21.1
+urllib3==1.26.5
 Werkzeug==0.12.2
diff --git a/container_b/requirements.txt b/container_b/requirements.txt
index 04dc0d8..71e1dbf 100644
--- a/container_b/requirements.txt
+++ b/container_b/requirements.txt
@@ -7,5 +7,5 @@ itsdangerous==0.24
 Jinja2==2.9.6
 MarkupSafe==1.0
 requests==2.18.1
-urllib3==1.21.1
+urllib3==1.26.5
 Werkzeug==0.12.2
diff --git a/requirements.txt b/requirements.txt
index e6fbb3a..14747b7 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -21,7 +21,7 @@ requests==2.18.1
 simplegeneric==0.8.1
 six==1.10.0
 traitlets==4.3.2
-urllib3==1.21.1
+urllib3==1.26.5
 wcwidth==0.1.7
 websocket-client==0.44.0
 Werkzeug==0.12.2