diff --git a/py3_requirements.txt b/py3_requirements.txt
index 9161a23..37b5a36 100644
--- a/py3_requirements.txt
+++ b/py3_requirements.txt
@@ -63,6 +63,6 @@ terminado==0.6
 tornado==4.3
 traitlets==4.2.1
 tweepy==3.5.0
-urllib3==1.15.1
+urllib3==1.26.5
 widgetsnbextension==1.2.2
 xlrd==0.9.4
diff --git a/py3_server_requirements.txt b/py3_server_requirements.txt
index c870d1e..973c978 100644
--- a/py3_server_requirements.txt
+++ b/py3_server_requirements.txt
@@ -84,6 +84,6 @@ terminado==0.6
 tornado==4.3
 traitlets==4.2.1
 tweepy==3.5.0
-urllib3==1.15.1
+urllib3==1.26.5
 widgetsnbextension==1.2.2
 xlrd==0.9.4
diff --git a/requirements.txt b/requirements.txt
index ec17770..a22039c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -65,6 +65,6 @@ terminado==0.6
 tornado==4.3
 traitlets==4.2.1
 tweepy==3.5.0
-urllib3==1.15.1
+urllib3==1.26.5
 widgetsnbextension==1.2.2
 xlrd==0.9.4