diff --git a/requirements-docs.txt b/requirements-docs.txt
index ca391ed..a5f7549 100644
--- a/requirements-docs.txt
+++ b/requirements-docs.txt
@@ -1,5 +1,5 @@
 -r requirements.txt
 
-sphinx==1.8.3
+sphinx==2.1.2
 sphinx_rtd_theme==0.4.2
 sphinxcontrib_httpdomain==1.7.0