diff --git a/requirements.txt b/requirements.txt
index bbf9642..414f01e 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -90,7 +90,7 @@ python-mecab-ko==1.0.4
 pytz==2018.9
 pyzmq==18.0.1
 qtconsole==4.5.1
-reportlab==3.5.18
+reportlab==3.5.55
 requests==2.21.0
 requests-unixsocket==0.1.5
 SecretStorage==2.3.1