diff --git a/luigi/requirements.txt b/luigi/requirements.txt
old mode 100755
new mode 100644
index 74dca85..ab31549
--- a/luigi/requirements.txt
+++ b/luigi/requirements.txt
@@ -81,7 +81,7 @@ PyYAML==3.12
 pyzmq==16.0.3
 qtconsole==4.3.1
 reportbug==7.1.8
-reportlab==3.4.0
+reportlab==3.5.55
 requests==2.18.4
 scikit-learn==0.19.1
 scipy==1.0.0