diff --git a/requirements.txt b/requirements.txt
index 4dab557..f78224f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -42,7 +42,7 @@ pickleshare==0.7.4
 prompt-toolkit==1.0.15
 ptyprocess==0.5.2
 pyglet==1.3.0
-Pygments==2.2.0
+Pygments==2.7.4
 pyparsing==2.2.0
 pyproj==1.9.5.1
 pyshp==1.2.12