diff --git a/requirements.txt b/requirements.txt
index 2492ea7..be93528 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,19 +1,17 @@
-certifi==2018.4.16
+certifi==2021.5.30
 chardet==3.0.4
-click==6.7
+click==8.0.1
 Flask==1.0.2
-gevent==1.3.4
-greenlet==0.4.13
+gevent==21.1.2
+greenlet==1.1.0
 gunicorn==19.8.1
 idna==2.7
 itsdangerous==0.24
 Jinja2==2.10
 MarkupSafe==1.1.1
 pyasn1==0.4.3
-pyasn1-modules==0.2.2
-pytz==2018.4
 requests==2.19.1
-rsa==3.4.2
-six==1.11.0
 urllib3==1.23
 Werkzeug==0.14.1
+zope.event==4.5.0
+zope.interface==5.4.0