diff --git a/Docker/sslip.io-dns-server/Dockerfile b/Docker/sslip.io-dns-server/Dockerfile
index 8a2f699..84d176d 100644
--- a/Docker/sslip.io-dns-server/Dockerfile
+++ b/Docker/sslip.io-dns-server/Dockerfile
@@ -26,7 +26,7 @@ LABEL org.opencontainers.image.authors="Brian Cunnie <brian.cunnie@gmail.com>"
 RUN dnf install -y bind-utils
 
 ARG TARGETARCH # amd64, arm64 (so I can run on AWS graviton2)
-RUN curl -f -L https://github.com/cunnie/sslip.io/releases/download/3.2.8/sslip.io-dns-server-linux-$TARGETARCH \
+RUN curl -f -L https://github.com/cunnie/sslip.io/releases/download/4.0.0/sslip.io-dns-server-linux-$TARGETARCH \
     -o /usr/sbin/sslip.io-dns-server; \
   chmod 755 /usr/sbin/sslip.io-dns-server
 
diff --git a/bin/make_all b/bin/make_all
index 60edd59..f1857b3 100755
--- a/bin/make_all
+++ b/bin/make_all
@@ -4,7 +4,7 @@
 #
 DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null 2>&1 && pwd )"
 cd $DIR/..
-ldflags="-X xip/xip.VersionSemantic=3.2.8 \
+ldflags="-X xip/xip.VersionSemantic=4.0.0 \
          -X xip/xip.VersionDate=$(date +%Y/%m/%d-%H:%M:%S%z) \
          -X xip/xip.VersionGitHash=$(git rev-parse --short HEAD)"
 export GOOS GOARCH
diff --git a/docs/DEVELOPER.md b/docs/DEVELOPER.md
index 42f6f41..954db87 100644
--- a/docs/DEVELOPER.md
+++ b/docs/DEVELOPER.md
@@ -4,8 +4,8 @@ These instructions are meant primarily for me when deploying a new release;
 they might not make sense unless you're on my workstation.
 
 ```bash
-export OLD_VERSION=3.2.7
-export VERSION=3.2.8
+export OLD_VERSION=3.2.8
+export VERSION=4.0.0
 cd ~/workspace/sslip.io
 git pull -r --autostash
 # update the version number for the TXT record for version.status.sslip.io
@@ -41,7 +41,7 @@ Test from another window:
 
 ```bash
 export DNS_SERVER_IP=127.0.0.1
-export VERSION=3.2.8
+export VERSION=4.0.0
 # quick sanity test
 dig +short 127.0.0.1.example.com @$DNS_SERVER_IP
 echo 127.0.0.1
@@ -54,6 +54,8 @@ dig +short mx sslip.io @$DNS_SERVER_IP
 printf "10 mail.protonmail.ch.\n20 mailsec.protonmail.ch.\n"
 dig +short txt sslip.io @$DNS_SERVER_IP
 printf "\"protonmail-verification=ce0ca3f5010aa7a2cf8bcc693778338ffde73e26\"\n\"v=spf1 include:_spf.protonmail.ch mx ~all\"\n"
+dig +short txt nip.io @$DNS_SERVER_IP
+printf "\"protonmail-verification=19b0837cc4d9daa1f49980071da231b00e90b313\"\n\"v=spf1 include:_spf.protonmail.ch mx ~all\"\n"
 dig +short txt 127.0.0.1.sslip.io @$DNS_SERVER_IP # no records
 dig +short cname sslip.io @$DNS_SERVER_IP # no records
 dig +short cname protonmail._domainkey.sslip.io @$DNS_SERVER_IP
diff --git a/spec/check-dns_spec.rb b/spec/check-dns_spec.rb
index 81c2fe9..f328915 100644
--- a/spec/check-dns_spec.rb
+++ b/spec/check-dns_spec.rb
@@ -18,7 +18,7 @@ def get_whois_nameservers(domain)
 end
 
 domain = ENV['DOMAIN'] || 'example.com'
-sslip_version = '3.2.8'
+sslip_version = '4.0.0'
 whois_nameservers = get_whois_nameservers(domain)
 
 describe domain do