diff --git a/docs/requirements.txt b/docs/requirements.txt
index a5a16995..0ac09448 100644
--- a/docs/requirements.txt
+++ b/docs/requirements.txt
@@ -54,7 +54,7 @@ pyparsing==2.2.0
 python-dateutil==2.7.2
 pytz==2017.3
 PyYAML==5.1
-reportlab==3.4.0
+reportlab==3.5.55
 requests==2.21.0
 ruamel.ordereddict==0.4.13
 ruamel.yaml==0.15.60