diff --git a/docs/requirements.txt b/docs/requirements.txt
index 4b1565b3..0407da5e 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -1,4 +1,4 @@
 Sphinx==1.8.5
-Pygments==2.2.0
+Pygments==2.7.4
 sphinx-autobuild
 sphinx_rtd_theme==0.2.5b1