diff --git a/Dockerfile b/Dockerfile
index 23f2b62..571609c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM goacme/lego:v4.16.1
+FROM goacme/lego:v4.17.3
 
 # Save certs and account to external volume
 VOLUME /.lego