diff --git a/requirements.txt b/requirements.txt
index 4ee743f..89ade4e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,11 +5,11 @@ arrow
 bleach
 blinker
 chardet
-cryptography
 docutils
 enum34
 flask
 flask-wtf
+html5lib  # required by bleach
 kitchen
 markdown
 munch
@@ -17,7 +17,6 @@ Pillow
 psutil
 pygit2 >= 0.20.1
 pygments
-python-fedora
 python-openid
 python-openid-cla
 python-openid-teams
@@ -27,5 +26,11 @@ sqlalchemy >= 0.8
 straight.plugin==1.4.0-post-1
 trollius-redis
 wtforms
+
+
+# Required only for the `fas` and `openid` authentication backends
+python-fedora
+
+# Required only for the `local` authentication backend
+cryptography
 py-bcrypt
-html5lib # required by bleach