diff --git a/requirements.txt b/requirements.txt
index 9cdedc3..e4f0c97 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,7 +1,12 @@
+cffi==1.13.2
 Click==7.0
+cryptography==2.8
 Flask==1.1.1
 itsdangerous==1.1.0
 Jinja2==2.10.3
 MarkupSafe==1.1.1
+pycparser==2.19
 pycurl==7.43.0.4
+pyOpenSSL==19.1.0
+six==1.14.0
 Werkzeug==0.16.0