diff --git a/web_application/heroku_deployment/requirements.txt b/web_application/heroku_deployment/requirements.txt
index 100463a..a495b00 100644
--- a/web_application/heroku_deployment/requirements.txt
+++ b/web_application/heroku_deployment/requirements.txt
@@ -16,7 +16,7 @@ pickleshare==0.7.4
 prompt-toolkit==1.0.15
 psycopg2==2.7.3.2
 ptyprocess==0.5.2
-Pygments==2.2.0
+Pygments==2.7.4
 simplegeneric==0.8.1
 six==1.11.0
 SQLAlchemy==1.1.15