diff --git a/requirements_rtd.txt b/requirements_rtd.txt
index bb67c8e..c219b43 100644
--- a/requirements_rtd.txt
+++ b/requirements_rtd.txt
@@ -33,7 +33,7 @@ ptyprocess==0.5.2
 py==1.4.34
 pycodestyle==2.3.1
 pyflakes==1.5.0
-Pygments==2.2.0
+Pygments==2.7.4
 pyparsing==2.2.0
 python-dateutil==2.6.1
 python-monkey-business==1.0.0