diff --git a/docker/v3.6/requirements.txt b/docker/v3.6/requirements.txt
index 55f119a68..4ba7f95ed 100644
--- a/docker/v3.6/requirements.txt
+++ b/docker/v3.6/requirements.txt
@@ -92,7 +92,7 @@ pyvirtualdisplay==2.2
 pyzmq==16.0.2
 raven[flask]==6.9.0
 remote-pdb==1.3.0
-reportlab==3.5.21         # via xhtml2pdf
+reportlab==3.5.55         # via xhtml2pdf
 requests-oauthlib==0.8.0  # via google-auth-oauthlib, social-auth-core
 requests==2.21.0
 rsa==4.0                  # via google-auth