diff --git a/Dockerfile b/Dockerfile
index 0830ab4..f77c87c 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,8 +1,10 @@
-FROM ubuntu:xenial
+FROM ubuntu:focal
 
 RUN apt-get update && \
     apt-get install -y python3-pip cron && \
-    pip3 install simp_le-client && \
+    pip3 install simp_le-client==0.18.0 && \
+    apt-get clean && \
+    rm -rf /var/lib/apt/lists/* && \
     find /etc/cron* -type f -delete && \
     useradd simplecert && \
     touch /etc/crontab
diff --git a/simplewrapper.py b/simplewrapper.py
index f355ce7..acada8c 100644
--- a/simplewrapper.py
+++ b/simplewrapper.py
@@ -30,7 +30,8 @@ def call_le(email, domain_names):
                "--email", email,
                "-f", "account_key.json",
                "-f", "fullchain.pem",
-               "-f", "key.pem"]
+               "-f", "key.pem",
+               "-f", "account_reg.json"]
 
     for domain in domain_names:
         le_call += ["-d", domain]