diff --git a/docs/requirements.yaml b/docs/requirements.yaml
index b761006..5f751a9 100644
--- a/docs/requirements.yaml
+++ b/docs/requirements.yaml
@@ -7,7 +7,7 @@ dependencies:
     - python
     - pip
 
-    - sphinxcontrib-bibtex
+    - sphinxcontrib-bibtex=2.5.0
 
     - numpy
     - scipy