diff --git a/docs/requirements.txt b/docs/requirements.txt
index 4fd8f212..fdd3319f 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,2 +1,2 @@
-Pygments==2.2
+Pygments==2.7.4
 pygments-mathematica==0.3.3
\ No newline at end of file