diff --git a/doc/requirements.txt b/doc/requirements.txt
index 38d8f59..2ea8901 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -1,3 +1,3 @@
 # Documentation
-sphinx>=1.6.2
+sphinx>2.1.0
 sphinx_rtd_theme==0.2.4
diff --git a/tox.ini b/tox.ini
index 8293ca1..00f106c 100644
--- a/tox.ini
+++ b/tox.ini
@@ -31,7 +31,8 @@ commands =
 [testenv:pep8]
 basepython = python3
 deps =
-    pipenv
+  pipenv
+  safety
 commands =
   pipenv install --dev
   bash -c {toxinidir}/tools/gate/whitespace-linter.sh
@@ -39,15 +40,18 @@ commands =
   flake8 {toxinidir}/spyglass {toxinidir}/tests
   bandit -r spyglass -n 5
   pipenv check
+  safety check -r {toxinidir}/doc/requirements.txt --bare
 whitelist_externals =
   bash
 
 [testenv:safety]
 deps =
-    pipenv
+  pipenv
+  safety
 commands =
   pipenv install --dev
   pipenv check
+  safety check -r {toxinidir}/doc/requirements.txt --full-report
 
 [testenv:bandit]
 deps =