diff --git a/docker-squid/Dockerfile b/docker-squid/Dockerfile
index 61e798d..7da9bce 100644
--- a/docker-squid/Dockerfile
+++ b/docker-squid/Dockerfile
@@ -1,6 +1,6 @@
 ARG DOCKER_PREFIX=
 
-FROM ${DOCKER_PREFIX}ubuntu:artful
+FROM ${DOCKER_PREFIX}ubuntu:focal
 
 ARG TRUST_CERT=
 
@@ -19,7 +19,7 @@ RUN apt-get update && \
     DEBIAN_FRONTEND=noninteractive apt-get build-dep -y squid && \
     DEBIAN_FRONTEND=noninteractive apt-get install -y wget tar xz-utils libssl-dev
 
-ARG SQUID_VERSION=4.0.21
+ARG SQUID_VERSION=4.12
 
 # TODO: verify the squid download with the signing key
 RUN mkdir /src \
diff --git a/docker-squid/squid.bsh b/docker-squid/squid.bsh
index 8fedf30..e7f2db3 100755
--- a/docker-squid/squid.bsh
+++ b/docker-squid/squid.bsh
@@ -38,7 +38,7 @@ chown proxy: /dev/stdout
 chown proxy: /dev/stderr
 
 # Initialize the certificates database
-/usr/libexec/security_file_certgen -c -s /var/spool/squid4/ssl_db
+/usr/libexec/security_file_certgen -c -s /var/spool/squid4/ssl_db -M 100MB
 chown -R proxy: /var/spool/squid4/ssl_db
 
 #ssl_crtd -c -s