diff --git a/requirements.txt b/requirements.txt
index 1109c726088..4d3555eef76 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -28,7 +28,7 @@ sphinxcontrib-jquery==4.1
 sphinxcontrib-jsmath==1.0.1
 sphinxcontrib-mermaid==2.0.0
 sphinx-notfound-page==1.1.0
-sphinxcontrib-phpdomain==0.13.2
+sphinxcontrib-phpdomain==0.15.1
 sphinxcontrib-qthelp==2.0.0
 sphinxcontrib-serializinghtml==2.0.0
 sphinx-toolbox==4.1.2