diff --git a/docs/requirements.txt b/docs/requirements.txt
index eb96d48..51610e4 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -19,4 +19,5 @@ sphinxcontrib-htmlhelp==2.0.1
 sphinxcontrib-jsmath==1.0.1
 sphinxcontrib-qthelp==1.0.3
 sphinxcontrib-serializinghtml==1.1.5
-uc-micro-py==1.0.3
\ No newline at end of file
+uc-micro-py==1.0.3
+pygments>=2.7
\ No newline at end of file