diff --git a/docs/source/conf.py b/docs/source/conf.py
index 15623ce9..2d9a7214 100644
--- a/docs/source/conf.py
+++ b/docs/source/conf.py
@@ -28,7 +28,7 @@
 
 # Add any Sphinx extension module names here, as strings. They can be extensions
 # coming with Sphinx (named 'sphinx.ext.*') or your custom ones.
-extensions = ["sphinx.ext.autodoc", "sphinx.ext.pngmath", "sphinx.ext.viewcode"]
+extensions = ["sphinx.ext.autodoc", "sphinx.ext.imgmath", "sphinx.ext.viewcode"]
 
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ["_templates"]