diff --git a/requirements/docs.txt b/requirements/docs.txt
index 80ba7e740..9627ef6a7 100644
--- a/requirements/docs.txt
+++ b/requirements/docs.txt
@@ -18,7 +18,6 @@ sphinx-copybutton >= 0.5
 sphinx-gallery >= 0.12
 sphinx-hoverxref >= 1.1
 sphinx-issues >= 3.0
-sphinx.ext.viewcode
 sphinx_automodapi
 sphinx_codeautolink
 sphinx_copybutton