diff --git a/setup.cfg b/setup.cfg
index ad6db80..dd9aebf 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -60,7 +60,7 @@ doc =
     m2r2~=0.3.1
     pydata-sphinx-theme>=0.7.2,<0.9.0
     sphinx-panels~=0.6.0
-    sphinxcontrib-bibtex~=2.3.0
+    sphinxcontrib-bibtex>=2.3,<2.6
     pandoc>=2.0.1,<2.2.0
     nbsphinx~=0.8.7
     nbsphinx-link~=1.3.0