diff --git a/releasenotes/source/conf.py b/releasenotes/source/conf.py
index 51f88ee..4eef1f9 100644
--- a/releasenotes/source/conf.py
+++ b/releasenotes/source/conf.py
@@ -38,7 +38,7 @@
 # extensions coming with Sphinx (named 'sphinx.ext.*') or your custom
 # ones.
 extensions = [
-    'oslosphinx',
+    'openstackdocstheme',
     'reno.sphinxext',
 ]