diff --git a/requirements.txt b/requirements.txt
index 54844286..1c627715 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,18 +1,18 @@
 appdirs==1.4.0
 click==6.7
-Jinja2==2.9.6
+Jinja2==2.11.3
 livereload==2.5.1
 Markdown==2.6.8
 markdown-include==0.5.1
 MarkupSafe==1.0
-mkdocs==0.16.3
+mkdocs==1.3.0
 mkdocs-bootstrap==0.1.1
 mkdocs-bootswatch==0.4.0
 mkdocs-material==1.8.0
 packaging==16.8
-Pygments==2.2.0
+Pygments==2.7.4
 pymdown-extensions==3.5
 pyparsing==2.1.10
-PyYAML==3.12
+PyYAML==5.4
 six==1.10.0
-tornado==4.5.1
+tornado==5.1