diff --git a/source_code/CNN_DDPG_implementation/requirements.txt b/source_code/CNN_DDPG_implementation/requirements.txt
index 74eb8ff..ebb7e1c 100644
--- a/source_code/CNN_DDPG_implementation/requirements.txt
+++ b/source_code/CNN_DDPG_implementation/requirements.txt
@@ -41,7 +41,7 @@ protobuf==3.7.1
 ptan==0.3
 ptyprocess==0.6.0
 pyglet==1.3.2
-Pygments==2.3.1
+Pygments==2.7.4
 PyOpenGL==3.1.0
 pyparsing==2.3.1
 python-dateutil==2.8.0