diff --git a/doc/requirements.rtd.txt b/doc/requirements.rtd.txt
index a7b0ba5832..54f1045c73 100644
--- a/doc/requirements.rtd.txt
+++ b/doc/requirements.rtd.txt
@@ -6,5 +6,4 @@ sphinxcontrib-images
 sphinxcontrib-jquery
 sphinxcontrib-spelling==8.*
 sphinxemoji
-pygments-markdown-lexer
 pyenchant==3.2.*
diff --git a/doc/requirements.txt b/doc/requirements.txt
index b1395408cf..5b39f516d3 100644
--- a/doc/requirements.txt
+++ b/doc/requirements.txt
@@ -7,5 +7,4 @@ sphinxcontrib-images
 sphinxcontrib-jquery
 sphinxcontrib-spelling==8.*
 sphinxemoji
-pygments-markdown-lexer
 pyenchant==3.2.*