diff --git a/docs/requirements-docs.txt b/docs/requirements-docs.txt
index 3b3441a..e992682 100644
--- a/docs/requirements-docs.txt
+++ b/docs/requirements-docs.txt
@@ -1,3 +1,8 @@
-lfdocs-conf
 sphinx>=4.2.0  # BSD
 sphinx-rtd-theme>=1.0.0  # MIT
+sphinxcontrib-blockdiag  # BSD
+sphinxcontrib-seqdiag # BSD
+sphinxcontrib-swaggerdoc
+sphinxcontrib-spelling
+sphinxcontrib-plantuml
+sphinx-tabs