diff --git a/readme-vars.yml b/readme-vars.yml
index f5ce7dbc..14c800fd 100644
--- a/readme-vars.yml
+++ b/readme-vars.yml
@@ -51,6 +51,8 @@ opt_param_env_vars:
   - { env_var: "SUBDOMAINS", env_value: "www,", desc: "Subdomains you'd like the cert to cover (comma separated, no spaces) ie. `www,ftp,cloud`. For a wildcard cert, set this *exactly* to `wildcard` (wildcard cert is available via `dns` validation only)" }
   - { env_var: "CERTPROVIDER", env_value: "", desc: "Optionally define the cert provider. Set to `zerossl` for ZeroSSL certs (requires existing [ZeroSSL account](https://app.zerossl.com/signup) and the e-mail address entered in `EMAIL` env var). Otherwise defaults to Let's Encrypt." }
   - { env_var: "DNSPLUGIN", env_value: "cloudflare", desc: "Required if `VALIDATION` is set to `dns`. Options are `acmedns`, `aliyun`, `azure`, `bunny`, `cloudflare`, `cpanel`, `desec`, `digitalocean`, `directadmin`, `dnsimple`, `dnsmadeeasy`, `dnspod`, `do`, `domeneshop`, `dreamhost`, `duckdns`, `freedns`, `gandi`, `gehirn`, `glesys`, `godaddy`, `google`, `google-domains`, `he`, `hetzner`, `infomaniak`, `inwx`, `ionos`, `linode`, `loopia`, `luadns`, `namecheap`, `netcup`, `njalla`, `nsone`, `ovh`, `porkbun`, `rfc2136`, `route53`, `sakuracloud`, `standalone`, `transip`, and `vultr`. Also need to enter the credentials into the corresponding ini (or json for some plugins) file under `/config/dns-conf`." }
+  - { env_var: "ACMESERVER", env_value: "", desc: "The URL of a custom ACME server to use." }
+  - { env_var: "ACMECABUNDLE", env_value: "", desc: "A base64-encoded PEM file containing a CA bundle to trust, for use with an internal ACME CA. Required for a custom ACME CA." }
   - { env_var: "PROPAGATION", env_value: "", desc: "Optionally override (in seconds) the default propagation time for the dns plugins." }
   - { env_var: "EMAIL", env_value: "", desc: "Optional e-mail address used for cert expiration notifications (Required for ZeroSSL)." }
   - { env_var: "ONLY_SUBDOMAINS", env_value: "false", desc: "If you wish to get certs only for certain subdomains, but not the main domain (main domain may be hosted on another machine and cannot be validated), set this to `true`" }
@@ -168,6 +170,7 @@ app_setup_block: |
 
 # changelog
 changelogs:
+<<<<<<< HEAD
   - { date: "23.01.24:", desc: "Rebase to Alpine 3.19 with php 8.3, add root periodic crontabs for logrotate." }
   - { date: "01.01.24:", desc: "Add GleSYS DNS plugin." }
   - { date: "11.12.23:", desc: "Deprecate certbot-dns-dynu to resolve dependency conflicts with other plugins." }
@@ -179,6 +182,9 @@ changelogs:
   - { date: "07.08.23:", desc: "Add Bunny DNS Configuration." }
   - { date: "27.07.23:", desc: "Added support for dreamhost validation." }
   - { date: "25.05.23:", desc: "Rebase to Alpine 3.18, deprecate armhf." }
+=======
+  - { date: "21.05.23:", desc: "Allow custom ACME servers. Supply URL and CA bundle" }
+>>>>>>> 4d46d70 (Implements custom ACME servers)
   - { date: "27.04.23:", desc: "[Existing users should update:](https://github.com/linuxserver/docker-swag/blob/master/README.md#updating-configs) authelia-location.conf, authelia-server.conf, authentik-location.conf, authentik-server.conf - Simplify auth configs and fix Set-Cookie header bug." }
   - { date: "13.04.23:", desc: "[Existing users should update:](https://github.com/linuxserver/docker-swag/blob/master/README.md#updating-configs) nginx.conf, authelia-location.conf, authentik-location.conf, and site-confs/default.conf - Move ssl.conf include to default.conf. Remove Authorization headers in authelia. Sort proxy_set_header in authelia and authentik." }
   - { date: "25.03.23:", desc: "Fix renewal post hook." }
diff --git a/root/app/le-renew.sh b/root/app/le-renew.sh
index 7f2137a2..fa9aef0f 100644
--- a/root/app/le-renew.sh
+++ b/root/app/le-renew.sh
@@ -1,6 +1,10 @@
 #!/usr/bin/with-contenv bash
 # shellcheck shell=bash
 
+if [[ -f "/config/cabundle.pem" ]]; then
+	export REQUESTS_CA_BUNDLE="/config/cabundle.pem"
+fi
+
 echo "<------------------------------------------------->"
 echo
 echo "<------------------------------------------------->"
diff --git a/root/etc/s6-overlay/s6-rc.d/init-certbot-config/run b/root/etc/s6-overlay/s6-rc.d/init-certbot-config/run
index 800a806a..a67c565b 100755
--- a/root/etc/s6-overlay/s6-rc.d/init-certbot-config/run
+++ b/root/etc/s6-overlay/s6-rc.d/init-certbot-config/run
@@ -12,6 +12,8 @@ EXTRA_DOMAINS=${EXTRA_DOMAINS}\\n\
 ONLY_SUBDOMAINS=${ONLY_SUBDOMAINS}\\n\
 VALIDATION=${VALIDATION}\\n\
 CERTPROVIDER=${CERTPROVIDER}\\n\
+ACMESERVER=${ACMESERVER}\\n\
+ACMECABUNDLE=${ACMECABUNDLE}\\n\
 DNSPLUGIN=${DNSPLUGIN}\\n\
 EMAIL=${EMAIL}\\n\
 STAGING=${STAGING}\\n"
@@ -74,7 +76,7 @@ if [[ -f "/config/donoteditthisfile.conf" ]]; then
     mv /config/donoteditthisfile.conf /config/.donoteditthisfile.conf
 fi
 if [[ ! -f "/config/.donoteditthisfile.conf" ]]; then
-    echo -e "ORIGURL=\"${URL}\" ORIGSUBDOMAINS=\"${SUBDOMAINS}\" ORIGONLY_SUBDOMAINS=\"${ONLY_SUBDOMAINS}\" ORIGEXTRA_DOMAINS=\"${EXTRA_DOMAINS}\" ORIGVALIDATION=\"${VALIDATION}\" ORIGDNSPLUGIN=\"${DNSPLUGIN}\" ORIGPROPAGATION=\"${PROPAGATION}\" ORIGSTAGING=\"${STAGING}\" ORIGCERTPROVIDER=\"${CERTPROVIDER}\" ORIGEMAIL=\"${EMAIL}\"" >/config/.donoteditthisfile.conf
+    echo -e "ORIGURL=\"${URL}\" ORIGSUBDOMAINS=\"${SUBDOMAINS}\" ORIGONLY_SUBDOMAINS=\"${ONLY_SUBDOMAINS}\" ORIGEXTRA_DOMAINS=\"${EXTRA_DOMAINS}\" ORIGVALIDATION=\"${VALIDATION}\" ORIGDNSPLUGIN=\"${DNSPLUGIN}\" ORIGPROPAGATION=\"${PROPAGATION}\" ORIGSTAGING=\"${STAGING}\" ORIGCERTPROVIDER=\"${CERTPROVIDER}\"  ORIGACMESERVER=\"$ACMESERVER\" ORIGACMECABUNDLE=\"$ACMECABUNDLE\" ORIGEMAIL=\"${EMAIL}\"" >/config/.donoteditthisfile.conf
     echo "Created .donoteditthisfile.conf"
 fi
 
@@ -207,10 +209,10 @@ if [[ ! "${URL}" = "${ORIGURL}" ]] ||
 fi
 
 # saving new variables
-echo -e "ORIGURL=\"${URL}\" ORIGSUBDOMAINS=\"${SUBDOMAINS}\" ORIGONLY_SUBDOMAINS=\"${ONLY_SUBDOMAINS}\" ORIGEXTRA_DOMAINS=\"${EXTRA_DOMAINS}\" ORIGVALIDATION=\"${VALIDATION}\" ORIGDNSPLUGIN=\"${DNSPLUGIN}\" ORIGPROPAGATION=\"${PROPAGATION}\" ORIGSTAGING=\"${STAGING}\" ORIGCERTPROVIDER=\"${CERTPROVIDER}\" ORIGEMAIL=\"${EMAIL}\"" >/config/.donoteditthisfile.conf
+echo -e "ORIGURL=\"${URL}\" ORIGSUBDOMAINS=\"${SUBDOMAINS}\" ORIGONLY_SUBDOMAINS=\"${ONLY_SUBDOMAINS}\" ORIGEXTRA_DOMAINS=\"${EXTRA_DOMAINS}\" ORIGVALIDATION=\"${VALIDATION}\" ORIGDNSPLUGIN=\"${DNSPLUGIN}\" ORIGPROPAGATION=\"${PROPAGATION}\" ORIGSTAGING=\"${STAGING}\" ORIGCERTPROVIDER=\"${CERTPROVIDER}\" ORIGACMESERVER=\"$ACMESERVER\" ORIGACMECABUNDLE=\"$ACMECABUNDLE\" ORIGEMAIL=\"${EMAIL}\"" >/config/.donoteditthisfile.conf
 
 # Check if the cert is using the old LE root cert, revoke and regen if necessary
-if [[ -f "/config/keys/letsencrypt/chain.pem" ]] && { [[ "${CERTPROVIDER}" == "letsencrypt" ]] || [[ "${CERTPROVIDER}" == "" ]]; } && [[ "${STAGING}" != "true" ]] && ! openssl x509 -in /config/keys/letsencrypt/chain.pem -noout -issuer | grep -q "ISRG Root X"; then
+if [[ -f "/config/keys/letsencrypt/chain.pem" ]] && { [[ "${CERTPROVIDER}" == "letsencrypt" ]] || ([[ "${CERTPROVIDER}" == "" ]] && [[ -z "$ACMECABUNDLE" ]]); } && [[ "${STAGING}" != "true" ]] && ! openssl x509 -in /config/keys/letsencrypt/chain.pem -noout -issuer | grep -q "ISRG Root X"; then
     echo "The cert seems to be using the old LE root cert, which is no longer valid. Deleting and revoking."
     REV_ACMESERVER=("https://acme-v02.api.letsencrypt.org/directory")
     if [[ -f /config/etc/letsencrypt/live/"${ORIGDOMAIN}"/fullchain.pem ]]; then
@@ -225,12 +227,24 @@ fi
 if [[ "${CERTPROVIDER}" = "zerossl" ]] && [[ "${STAGING}" = "true" ]]; then
     echo "ZeroSSL does not support staging mode, ignoring STAGING variable"
 fi
+if [[ "${CERTPROVIDER}" = "custom" ]] && [[ "${STAGING}" = "true" ]]; then
+    echo "Custom ACME does not support staging mode, ignoring STAGING variable"
+fi
 if [[ "${CERTPROVIDER}" = "zerossl" ]] && [[ -n "${EMAIL}" ]]; then
     echo "ZeroSSL is selected as the cert provider, registering cert with ${EMAIL}"
     ACMESERVER="https://acme.zerossl.com/v2/DV90"
 elif [[ "${CERTPROVIDER}" = "zerossl" ]] && [[ -z "${EMAIL}" ]]; then
     echo "ZeroSSL is selected as the cert provider, but the e-mail address has not been entered. Please visit https://zerossl.com, register a new account and set the account e-mail address in the EMAIL environment variable"
     sleep infinity
+elif [[ "${CERTPROVIDER}" = "custom" ]] && [[ -n "${EMAIL}" ]]; then
+    echo "Using $ACMESERVER as the cert provider; registering cert with $EMAIL"
+    if [ -n "$ACMECABUNDLE" ]; then
+        echo "$ACMECABUNDLE" | base64 -d - > /config/cabundle.pem
+        export REQUESTS_CA_BUNDLE="/config/cabundle.pem"
+    fi
+elif [[ "${CERTPROVIDER}" = "custom" ]] && [[ -z "${EMAIL}" ]]; then
+    echo "A custom ACME server is selected as the cert provider, but the e-email address has not been entered."
+    sleep infinity
 elif [[ "${STAGING}" = "true" ]]; then
     echo "NOTICE: Staging is active"
     echo "Using Let's Encrypt as the cert provider"