diff --git a/requirements-dev.txt b/requirements-dev.txt
index 6647d01..eb54af1 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -14,8 +14,8 @@ pep8>=1.7,<1.8
 pyflakes
 
 # Documentation
-Jinja2==2.9.6
-MarkupSafe==1.0
-Pygments==2.2.0
-Sphinx==1.6.3
-docutils==0.13.1
+Jinja2==2.11.1
+MarkupSafe==1.1.1
+Pygments==2.5.2
+Sphinx==2.4.0
+docutils==0.16
diff --git a/requirements.txt b/requirements.txt
index e85ba74..08fe557 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -3,5 +3,5 @@ argh>=0.24.1
 pathtools>=0.1.2
 PyYAML>=3.10
 tornado>=3.2
-port_for==0.3.1
+port-for==0.4
 livereload>=2.3.0