diff --git a/doc/conf.py b/doc/conf.py
index 6f3fbc3d..2a66f2fe 100644
--- a/doc/conf.py
+++ b/doc/conf.py
@@ -40,7 +40,7 @@
 #
 # The full version, including alpha/beta/rc tags.
 with open("../src/sphinxcontrib/bibtex/__init__.py", "rt") as version_file:
-    release = re.search("'version': '(.+)'", version_file.read()).group(1)
+    release = re.search('"version": "(.+)"', version_file.read()).group(1)
 # The short X.Y version.
 version = ".".join(release.split(".")[:2])