diff --git a/README.md b/README.md
index 709585d9..5c9232ad 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,7 @@ This Java client helps connecting to an ACME server, and performing all necessar
 * Supports [RFC 8739](https://tools.ietf.org/html/rfc8739) short-term automatic certificate renewal (experimental)
 * Supports [RFC 8823](https://tools.ietf.org/html/rfc8823) for S/MIME certificates (experimental)
 * Supports [RFC 9444](https://tools.ietf.org/html/rfc9444) for subdomain validation
-* Supports [draft-ietf-acme-ari-03](https://www.ietf.org/archive/id/draft-ietf-acme-ari-03.html) for renewal information (experimental)
+* Supports [draft-ietf-acme-ari-04](https://www.ietf.org/archive/id/draft-ietf-acme-ari-04.html) for renewal information (experimental)
 * Easy to use Java API
 * Requires JRE 11 or higher
 * Supports [Let's Encrypt](https://letsencrypt.org/), [SSL.com](https://www.ssl.com/), [ZeroSSL](https://zerossl.com), and all other CAs that comply with the ACME protocol (RFC 8555). Note that _acme4j_ is an independent project that is not supported or endorsed by any of the CAs.
diff --git a/acme4j-client/src/main/java/org/shredzone/acme4j/toolbox/AcmeUtils.java b/acme4j-client/src/main/java/org/shredzone/acme4j/toolbox/AcmeUtils.java
index ce523c13..fd26a94a 100644
--- a/acme4j-client/src/main/java/org/shredzone/acme4j/toolbox/AcmeUtils.java
+++ b/acme4j-client/src/main/java/org/shredzone/acme4j/toolbox/AcmeUtils.java
@@ -332,8 +332,7 @@ public static void validateContact(URI contact) {
     }
 
     /**
-     * Returns the certificate's unique identifier for renewal according to
-     * draft-ietf-acme-ari-03.
+     * Returns the certificate's unique identifier for renewal.
      *
      * @param certificate
      *         Certificate to get the unique identifier for.
diff --git a/acme4j-client/src/test/java/org/shredzone/acme4j/CertificateTest.java b/acme4j-client/src/test/java/org/shredzone/acme4j/CertificateTest.java
index 23df6e93..d3281a9c 100644
--- a/acme4j-client/src/test/java/org/shredzone/acme4j/CertificateTest.java
+++ b/acme4j-client/src/test/java/org/shredzone/acme4j/CertificateTest.java
@@ -284,7 +284,7 @@ public int sendSignedRequest(URL url, JSONBuilder claims, Session session, KeyPa
      */
     @Test
     public void testRenewalInfo() throws AcmeException, IOException {
-        // certid-cert.pem and certId provided by draft-ietf-acme-ari-03 and known good
+        // certid-cert.pem and certId provided by ACME ARI specs and known good
         var certId = "aYhba4dGQEHhs3uEe6CuLN4ByNQ.AIdlQyE";
         var certIdCert = TestUtils.createCertificate("/certid-cert.pem");
         var certResourceUrl = new URL(resourceUrl.toExternalForm() + "/" + certId);
@@ -364,7 +364,7 @@ public Optional<Instant> getRetryAfter() {
      */
     @Test
     public void testMarkedAsReplaced() throws AcmeException, IOException {
-        // certid-cert.pem and certId provided by draft-ietf-acme-ari-03 and known good
+        // certid-cert.pem and certId provided by ACME ARI specs and known good
         var certId = "aYhba4dGQEHhs3uEe6CuLN4ByNQ.AIdlQyE";
         var certIdCert = TestUtils.createCertificate("/certid-cert.pem");
         var certResourceUrl = new URL(resourceUrl.toExternalForm() + "/" + certId);
diff --git a/src/doc/docs/index.md b/src/doc/docs/index.md
index 40925c5f..1223728e 100644
--- a/src/doc/docs/index.md
+++ b/src/doc/docs/index.md
@@ -19,7 +19,7 @@ Latest version: ![maven central](https://shredzone.org/maven-central/org.shredzo
 * Supports [RFC 8739](https://tools.ietf.org/html/rfc8739) short-term automatic certificate renewal (experimental)
 * Supports [RFC 8823](https://tools.ietf.org/html/rfc8823) for S/MIME certificates (experimental)
 * Supports [RFC 9444](https://tools.ietf.org/html/rfc9444) for subdomain validation
-* Supports [draft-ietf-acme-ari-03](https://www.ietf.org/archive/id/draft-ietf-acme-ari-03.html) for renewal information (experimental)
+* Supports [draft-ietf-acme-ari-04](https://www.ietf.org/archive/id/draft-ietf-acme-ari-04.html) for renewal information (experimental)
 * Easy to use Java API
 * Requires JRE 11 or higher
 * Supports [Let's Encrypt](https://letsencrypt.org/), [SSL.com](https://www.ssl.com/), [ZeroSSL](https://zerossl.com), and all other CAs that comply with the ACME protocol (RFC 8555). Note that _acme4j_ is an independent project that is not supported or endorsed by any of the CAs.
diff --git a/src/doc/docs/usage/renewal.md b/src/doc/docs/usage/renewal.md
index 558362db..0464de93 100644
--- a/src/doc/docs/usage/renewal.md
+++ b/src/doc/docs/usage/renewal.md
@@ -13,7 +13,7 @@ There is no special path for renewing a certificate. To renew it, just [order](o
 
 ## Renewal Information
 
-_acme4j_ supports the [draft-ietf-acme-ari-03](https://www.ietf.org/archive/id/draft-ietf-acme-ari-03.html) draft.
+_acme4j_ supports the [draft-ietf-acme-ari-04](https://www.ietf.org/archive/id/draft-ietf-acme-ari-04.html) draft.
 
 You can check if the CA offers renewal information by invoking `Certificate.hasRenewalInfo()`. If it does, you can get a suggested time window for certificate nenewal by invoking `Certificate.getRenewalInfo()`.