diff --git a/requirements.txt b/requirements.txt
index 2d98257cd..cd46838cc 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -27,7 +27,7 @@ sphinxcontrib-htmlhelp==2.1.0
 sphinxcontrib-jquery==4.1
 sphinxcontrib-jsmath==1.0.1
 sphinxcontrib-mermaid==1.0.0
-sphinxcontrib-phpdomain==0.12.0
+sphinxcontrib-phpdomain==0.13.0
 sphinxcontrib-qthelp==2.0.0
 sphinxcontrib-serializinghtml==2.0.0
 sphinx-toolbox==3.9.0