diff --git a/doc/source/conf.py b/doc/source/conf.py
index 1b4e0911fb..75a3d3bf4c 100644
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -47,7 +47,6 @@
     "sphinxcontrib.jquery",
     "sphinx.ext.autosummary",
     "sphinx.ext.viewcode",
-    "sphinxcontrib.bibtex",
 ]
 
 # Mapping for linking between RTD subprojects.