diff --git a/acme4j-client/src/main/java/org/shredzone/acme4j/Certificate.java b/acme4j-client/src/main/java/org/shredzone/acme4j/Certificate.java
index 827f1c8f..6408db0f 100644
--- a/acme4j-client/src/main/java/org/shredzone/acme4j/Certificate.java
+++ b/acme4j-client/src/main/java/org/shredzone/acme4j/Certificate.java
@@ -268,6 +268,28 @@ public class Certificate extends AcmeResource {
         return renewalInfo;
     }
 
+    /**
+     * Signals to the CA that this certificate has been successfully replaced by a newer
+     * one. A revocation of this certificate would not disrupt any ongoing services.
+     * <p>
+     * This method is only supported by CAs that are providing renewal information
+     * (see {@link #hasRenewalInfo()}. An {@link AcmeNotSupportedException} is thrown
+     * otherwise.
+     *
+     * @since 3.1.0
+     */
+    public void markAsReplaced() throws AcmeException {
+        LOG.debug("mark as replaced");
+        var session = getSession();
+        var renewalInfoUrl = session.resourceUrl(Resource.RENEWAL_INFO);
+        try (var conn = session.connect()) {
+            var claims = new JSONBuilder();
+            claims.put("certID", getCertID());
+            claims.put("replaced", true);
+            conn.sendSignedRequest(renewalInfoUrl, claims, getLogin());
+        }
+    }
+
     /**
      * Revokes this certificate.
      */
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 02ff0c80..062f89dc 100644
--- a/acme4j-client/src/test/java/org/shredzone/acme4j/CertificateTest.java
+++ b/acme4j-client/src/test/java/org/shredzone/acme4j/CertificateTest.java
@@ -15,6 +15,7 @@ package org.shredzone.acme4j;
 
 import static net.javacrumbs.jsonunit.assertj.JsonAssertions.assertThatJson;
 import static org.assertj.core.api.Assertions.assertThat;
+import static org.assertj.core.api.Assertions.assertThatExceptionOfType;
 import static org.shredzone.acme4j.toolbox.TestUtils.*;
 
 import java.io.ByteArrayOutputStream;
@@ -36,6 +37,7 @@ import java.util.Optional;
 import org.junit.jupiter.api.Test;
 import org.shredzone.acme4j.connector.Resource;
 import org.shredzone.acme4j.exception.AcmeException;
+import org.shredzone.acme4j.exception.AcmeNotSupportedException;
 import org.shredzone.acme4j.provider.TestableConnectionProvider;
 import org.shredzone.acme4j.toolbox.JSON;
 import org.shredzone.acme4j.toolbox.JSONBuilder;
@@ -358,4 +360,101 @@ public class CertificateTest {
         provider.close();
     }
 
+    /**
+     * Test that a certificate is marked as replaced.
+     */
+    @Test
+    public void testMarkedAsReplaced() throws AcmeException, IOException {
+        // certid-cert.pem and certId provided by draft-ietf-acme-ari-01 and known good
+        var certId = "MFswCwYJYIZIAWUDBAIBBCCeWLRusNLb--vmWOkxm34qDjTMWkc3utIhOMoMwKDqbgQg2iiKWySZrD-6c88HMZ6vhIHZPamChLlzGHeZ7pTS8jYCCD6jRWhlRB8c";
+        var certIdCert = TestUtils.createCertificate("/certid-cert.pem");
+        var certResourceUrl = new URL(resourceUrl.toExternalForm() + "/" + certId);
+
+        var provider = new TestableConnectionProvider() {
+            private boolean certRequested = false;
+
+            @Override
+            public int sendCertificateRequest(URL url, Login login) {
+                assertThat(url).isEqualTo(locationUrl);
+                assertThat(login).isNotNull();
+                certRequested = true;
+                return HttpURLConnection.HTTP_OK;
+            }
+
+            @Override
+            public int sendSignedRequest(URL url, JSONBuilder claims, Login login) {
+                assertThat(certRequested).isTrue();
+                assertThat(url).isEqualTo(resourceUrl);
+                assertThatJson(claims.toString()).isEqualTo(getJSON("replacedCertificateRequest").toString());
+                assertThat(login).isNotNull();
+                return HttpURLConnection.HTTP_OK;
+            }
+
+            @Override
+            public List<X509Certificate> readCertificates() {
+                assertThat(certRequested).isTrue();
+                return certIdCert;
+            }
+
+            @Override
+            public Collection<URL> getLinks(String relation) {
+                return Collections.emptyList();
+            }
+        };
+
+        provider.putTestResource(Resource.RENEWAL_INFO, resourceUrl);
+
+        var cert = new Certificate(provider.createLogin(), locationUrl);
+        assertThat(cert.getCertID()).isEqualTo(certId);
+        assertThat(cert.hasRenewalInfo()).isTrue();
+        assertThat(cert.getRenewalInfoLocation())
+                .isNotEmpty()
+                .contains(certResourceUrl);
+
+        cert.markAsReplaced();
+
+        provider.close();
+    }
+
+    /**
+     * Test that markAsReplaced() throws an exception if not supported.
+     */
+    @Test
+    public void testMarkedAsReplacedThrowsIfNotSupported() throws AcmeException, IOException {
+        var certIdCert = TestUtils.createCertificate("/certid-cert.pem");
+
+        var provider = new TestableConnectionProvider() {
+            private boolean certRequested = false;
+
+            @Override
+            public int sendCertificateRequest(URL url, Login login) {
+                assertThat(url).isEqualTo(locationUrl);
+                assertThat(login).isNotNull();
+                certRequested = true;
+                return HttpURLConnection.HTTP_OK;
+            }
+
+            @Override
+            public List<X509Certificate> readCertificates() {
+                assertThat(certRequested).isTrue();
+                return certIdCert;
+            }
+
+            @Override
+            public Collection<URL> getLinks(String relation) {
+                return Collections.emptyList();
+            }
+        };
+
+        // We just need a dummy resource to create a directory
+        provider.putTestResource(Resource.NEW_ORDER, resourceUrl);
+
+        assertThatExceptionOfType(AcmeNotSupportedException.class).isThrownBy(() -> {
+            var cert = new Certificate(provider.createLogin(), locationUrl);
+            cert.markAsReplaced();
+        });
+
+        provider.close();
+    }
+
 }
diff --git a/acme4j-client/src/test/resources/json/replacedCertificateRequest.json b/acme4j-client/src/test/resources/json/replacedCertificateRequest.json
new file mode 100644
index 00000000..fbe0a0e3
--- /dev/null
+++ b/acme4j-client/src/test/resources/json/replacedCertificateRequest.json
@@ -0,0 +1,4 @@
+{
+  "certID": "MFswCwYJYIZIAWUDBAIBBCCeWLRusNLb--vmWOkxm34qDjTMWkc3utIhOMoMwKDqbgQg2iiKWySZrD-6c88HMZ6vhIHZPamChLlzGHeZ7pTS8jYCCD6jRWhlRB8c",
+  "replaced": true
+}
\ No newline at end of file