diff --git a/Dockerfile b/Dockerfile
index 37d4ae6..69869a3 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:3.7
+FROM python:3.7@sha256:eedf63967cdb57d8214db38ce21f105003ed4e4d0358f02bedc057341bcf92a0
 
 MAINTAINER Rémi Jouannet "remi.jouannet@outscale.com"