diff --git a/requirements.txt b/requirements.txt
index a113497..266cf98 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,5 +1,6 @@
-sphinx==1.8.0
+sphinx==2.4.5
 sphinx-rtd-theme==0.4.3
 sphinxcontrib-plantuml==0.15
 sphinxcontrib-httpdomain==1.7.0
-docutils==0.14
\ No newline at end of file
+docutils==0.14
+sphinx-tabs==3.3.1
\ No newline at end of file