diff --git a/core/modules/update/src/ProjectSecurityData.php b/core/modules/update/src/ProjectSecurityData.php
index 6df3899a3af7060bc44af3c70386e565b2a82daa..6c927c5e0f3ff8e5baac7e3c46d90294766c6468 100644
--- a/core/modules/update/src/ProjectSecurityData.php
+++ b/core/modules/update/src/ProjectSecurityData.php
@@ -39,11 +39,13 @@ final class ProjectSecurityData {
    *
    * @see \Drupal\update\ProjectSecurityRequirement::getDateEndRequirement()
    */
-  const SECURITY_COVERAGE_END_DATE_8_8 = '2020-12-02';
+  const SECURITY_COVERAGE_END_DATE_9_4 = '2023-06-21';
 
-  const SECURITY_COVERAGE_ENDING_WARN_DATE_8_8 = '2020-06-02';
+  const SECURITY_COVERAGE_ENDING_WARN_DATE_9_4 = '2022-12-14';
 
-  const SECURITY_COVERAGE_END_DATE_8_9 = '2021-11';
+  const SECURITY_COVERAGE_END_DATE_9_5 = '2023-11';
+
+  const SECURITY_COVERAGE_ENDING_WARN_DATE_9_5 = '2023-05-14';
 
   /**
    * The existing (currently installed) version of the project.
diff --git a/core/modules/update/tests/fixtures/release-history/drupal.sec.10.5.0.xml b/core/modules/update/tests/fixtures/release-history/drupal.sec.10.5.0.xml
new file mode 100644
index 0000000000000000000000000000000000000000..511111f9513bce84d634fdd229708741ac1eddb5
--- /dev/null
+++ b/core/modules/update/tests/fixtures/release-history/drupal.sec.10.5.0.xml
@@ -0,0 +1,57 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+This fixture is used by Drupal\Tests\update\Functional\UpdateSemverCoreTest.
+
+It contains 2 releases:
+
+- 10.4.0: testSecurityCoverageMessage() checks EOL date warnings on the Status Report.
+- 10.5.0: testSecurityCoverageMessage() checks EOL date warnings on the Status Report.
+
+-->
+<project xmlns:dc="http://purl.org/dc/elements/1.1/">
+    <title>Drupal</title>
+    <short_name>drupal</short_name>
+    <dc:creator>Drupal</dc:creator>
+    <supported_branches>10.4.,10.5.</supported_branches>
+    <project_status>published</project_status>
+    <link>http://example.com/project/drupal</link>
+    <terms><term><name>Projects</name><value>Drupal project</value></term></terms>
+    <releases>
+        <release>
+            <name>Drupal 10.5.0</name>
+            <version>10.5.0</version>
+            <status>published</status>
+            <release_link>http://example.com/drupal-10-5-0-release</release_link>
+            <download_link>http://example.com/drupal-10-5-0.tar.gz</download_link>
+            <date>1750424641</date>
+            <terms>
+                <term>
+                    <name>Release type</name>
+                    <value>New features</value>
+                </term>
+                <term>
+                    <name>Release type</name>
+                    <value>Bug fixes</value>
+                </term>
+            </terms>
+        </release>
+        <release>
+          <name>Drupal 10.4.0</name>
+          <version>10.4.0</version>
+          <status>published</status>
+          <release_link>http://example.com/drupal-10-4-0-release</release_link>
+          <download_link>http://example.com/drupal-10-4-0.tar.gz</download_link>
+          <date>1730424641</date>
+          <terms>
+            <term>
+              <name>Release type</name>
+              <value>New features</value>
+            </term>
+            <term>
+              <name>Release type</name>
+              <value>Bug fixes</value>
+            </term>
+          </terms>
+        </release>
+    </releases>
+</project>
diff --git a/core/modules/update/tests/fixtures/release-history/drupal.sec.9.0.xml b/core/modules/update/tests/fixtures/release-history/drupal.sec.9.0.xml
deleted file mode 100644
index 03bb1c7af9b3ffdf1b5d6e082efea9b66bba4e6d..0000000000000000000000000000000000000000
--- a/core/modules/update/tests/fixtures/release-history/drupal.sec.9.0.xml
+++ /dev/null
@@ -1,102 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<project xmlns:dc="http://purl.org/dc/elements/1.1/">
-    <title>Drupal</title>
-    <short_name>drupal</short_name>
-    <dc:creator>Drupal</dc:creator>
-    <api_version>8.x</api_version>
-    <recommended_major>8</recommended_major>
-    <supported_majors>8,9</supported_majors>
-    <default_major>8</default_major>
-    <project_status>published</project_status>
-    <link>http://example.com/project/drupal</link>
-    <terms><term><name>Projects</name><value>Drupal project</value></term></terms>
-    <releases>
-        <release>
-            <name>Drupal 8.9.0</name>
-            <version>8.9.0</version>
-            <status>published</status>
-            <release_link>http://example.com/drupal-8-9-0-release</release_link>
-            <download_link>http://example.com/drupal-8-9-0.tar.gz</download_link>
-            <date>1250424641</date>
-            <terms>
-                <term>
-                    <name>Release type</name>
-                    <value>New features</value>
-                </term>
-                <term>
-                    <name>Release type</name>
-                    <value>Bug fixes</value>
-                </term>
-            </terms>
-        </release>
-        <release>
-            <name>drupal 8.9.0-beta2</name>
-            <version>8.9.0-beta2</version>
-            <status>published</status>
-            <release_link>http://example.com/drupal-8-9-0-beta2-release</release_link>
-            <download_link>http://example.com/drupal-8-9-0-beta2.tar.gz</download_link>
-            <date>1533298080</date>
-            <terms>
-                <term><name>Release type</name><value>Bug fixes</value></term>
-                <term><name>Release type</name><value>New features</value></term>
-            </terms>
-            <security>
-                Beta releases are not covered by Drupal security advisories.
-            </security>
-        </release>
-        <release>
-          <name>Drupal 8.8.0</name>
-          <version>8.8.0</version>
-          <status>published</status>
-          <release_link>http://example.com/drupal-8-8-0-release</release_link>
-          <download_link>http://example.com/drupal-8-8-0.tar.gz</download_link>
-          <date>1250424641</date>
-          <terms>
-            <term>
-              <name>Release type</name>
-              <value>New features</value>
-            </term>
-            <term>
-              <name>Release type</name>
-              <value>Bug fixes</value>
-            </term>
-          </terms>
-        </release>
-        <release>
-            <name>Drupal 8.1.0</name>
-            <version>8.1.0</version>
-            <status>published</status>
-            <release_link>http://example.com/drupal-8-1-0-release</release_link>
-            <download_link>http://example.com/drupal-8-1-0.tar.gz</download_link>
-            <date>1250424521</date>
-            <terms>
-                <term>
-                    <name>Release type</name>
-                    <value>New features</value>
-                </term>
-                <term>
-                    <name>Release type</name>
-                    <value>Bug fixes</value>
-                </term>
-            </terms>
-        </release>
-        <release>
-            <name>Drupal 8.0.0</name>
-            <version>8.0.0</version>
-            <status>published</status>
-            <release_link>http://example.com/drupal-8-0-0-release</release_link>
-            <download_link>http://example.com/drupal-8-0-0.tar.gz</download_link>
-            <date>1250424521</date>
-            <terms>
-                <term>
-                    <name>Release type</name>
-                    <value>New features</value>
-                </term>
-                <term>
-                    <name>Release type</name>
-                    <value>Bug fixes</value>
-                </term>
-            </terms>
-        </release>
-    </releases>
-</project>
diff --git a/core/modules/update/tests/fixtures/release-history/drupal.sec.9.5.0.xml b/core/modules/update/tests/fixtures/release-history/drupal.sec.9.5.0.xml
new file mode 100644
index 0000000000000000000000000000000000000000..282070c81c5ae10c8f9504190b583aaeeb20fb63
--- /dev/null
+++ b/core/modules/update/tests/fixtures/release-history/drupal.sec.9.5.0.xml
@@ -0,0 +1,57 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+This fixture is used by Drupal\Tests\update\Functional\UpdateSemverCoreTest.
+
+It contains 2 releases:
+
+- 9.4.0: testSecurityCoverageMessage() checks EOL date warnings on the Status Report.
+- 9.5.0: testSecurityCoverageMessage() checks EOL date warnings on the Status Report.
+
+-->
+<project xmlns:dc="http://purl.org/dc/elements/1.1/">
+    <title>Drupal</title>
+    <short_name>drupal</short_name>
+    <dc:creator>Drupal</dc:creator>
+    <supported_branches>9.4.,9.5.</supported_branches>
+    <project_status>published</project_status>
+    <link>http://example.com/project/drupal</link>
+    <terms><term><name>Projects</name><value>Drupal project</value></term></terms>
+    <releases>
+        <release>
+            <name>Drupal 9.5.0</name>
+            <version>9.5.0</version>
+            <status>published</status>
+            <release_link>http://example.com/drupal-9-5-0-release</release_link>
+            <download_link>http://example.com/drupal-9-5-0.tar.gz</download_link>
+            <date>1670972400</date>
+            <terms>
+                <term>
+                    <name>Release type</name>
+                    <value>New features</value>
+                </term>
+                <term>
+                    <name>Release type</name>
+                    <value>Bug fixes</value>
+                </term>
+            </terms>
+        </release>
+        <release>
+          <name>Drupal 9.4.0</name>
+          <version>9.4.0</version>
+          <status>published</status>
+          <release_link>http://example.com/drupal-9-4-0-release</release_link>
+          <download_link>http://example.com/drupal-9-4-0.tar.gz</download_link>
+          <date>1655244000</date>
+          <terms>
+            <term>
+              <name>Release type</name>
+              <value>New features</value>
+            </term>
+            <term>
+              <name>Release type</name>
+              <value>Bug fixes</value>
+            </term>
+          </terms>
+        </release>
+    </releases>
+</project>
diff --git a/core/modules/update/tests/fixtures/release-history/drupal.sec.9.9.0.xml b/core/modules/update/tests/fixtures/release-history/drupal.sec.9.9.0.xml
deleted file mode 100644
index 84aee5093c4c59da05ccc8f0f03a8305ffc4124b..0000000000000000000000000000000000000000
--- a/core/modules/update/tests/fixtures/release-history/drupal.sec.9.9.0.xml
+++ /dev/null
@@ -1,102 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<project xmlns:dc="http://purl.org/dc/elements/1.1/">
-    <title>Drupal</title>
-    <short_name>drupal</short_name>
-    <dc:creator>Drupal</dc:creator>
-    <api_version>9.x</api_version>
-    <recommended_major>8</recommended_major>
-    <supported_majors>8,9</supported_majors>
-    <default_major>9</default_major>
-    <project_status>published</project_status>
-    <link>http://example.com/project/drupal</link>
-    <terms><term><name>Projects</name><value>Drupal project</value></term></terms>
-    <releases>
-        <release>
-            <name>Drupal 9.9.0</name>
-            <version>9.9.0</version>
-            <status>published</status>
-            <release_link>http://example.com/drupal-9-9-0-release</release_link>
-            <download_link>http://example.com/drupal-9-9-0.tar.gz</download_link>
-            <date>1250424641</date>
-            <terms>
-                <term>
-                    <name>Release type</name>
-                    <value>New features</value>
-                </term>
-                <term>
-                    <name>Release type</name>
-                    <value>Bug fixes</value>
-                </term>
-            </terms>
-        </release>
-        <release>
-            <name>drupal 9.9.0-beta2</name>
-            <version>9.9.0-beta2</version>
-            <status>published</status>
-            <release_link>http://example.com/drupal-9-9-0-beta2-release</release_link>
-            <download_link>http://example.com/drupal-9-9-0-beta2.tar.gz</download_link>
-            <date>1533298080</date>
-            <terms>
-                <term><name>Release type</name><value>Bug fixes</value></term>
-                <term><name>Release type</name><value>New features</value></term>
-            </terms>
-            <security>
-                Beta releases are not covered by Drupal security advisories.
-            </security>
-        </release>
-        <release>
-          <name>Drupal 9.8.0</name>
-          <version>9.8.0</version>
-          <status>published</status>
-          <release_link>http://example.com/drupal-9-8-0-release</release_link>
-          <download_link>http://example.com/drupal-9-8-0.tar.gz</download_link>
-          <date>1250424641</date>
-          <terms>
-            <term>
-              <name>Release type</name>
-              <value>New features</value>
-            </term>
-            <term>
-              <name>Release type</name>
-              <value>Bug fixes</value>
-            </term>
-          </terms>
-        </release>
-        <release>
-            <name>Drupal 9.1.0</name>
-            <version>9.1.0</version>
-            <status>published</status>
-            <release_link>http://example.com/drupal-9-1-0-release</release_link>
-            <download_link>http://example.com/drupal-9-1-0.tar.gz</download_link>
-            <date>1250424521</date>
-            <terms>
-                <term>
-                    <name>Release type</name>
-                    <value>New features</value>
-                </term>
-                <term>
-                    <name>Release type</name>
-                    <value>Bug fixes</value>
-                </term>
-            </terms>
-        </release>
-        <release>
-            <name>Drupal 9.0.0</name>
-            <version>9.0.0</version>
-            <status>published</status>
-            <release_link>http://example.com/drupal-9-0-0-release</release_link>
-            <download_link>http://example.com/drupal-9-0-0.tar.gz</download_link>
-            <date>1250424521</date>
-            <terms>
-                <term>
-                    <name>Release type</name>
-                    <value>New features</value>
-                </term>
-                <term>
-                    <name>Release type</name>
-                    <value>Bug fixes</value>
-                </term>
-            </terms>
-        </release>
-    </releases>
-</project>
diff --git a/core/modules/update/tests/src/Functional/UpdateSemverCoreTest.php b/core/modules/update/tests/src/Functional/UpdateSemverCoreTest.php
index a8886d4a82ae378aa78f25034a7d24d1ba84c523..d740425fbd602f997e355cd156e749b968f90902 100644
--- a/core/modules/update/tests/src/Functional/UpdateSemverCoreTest.php
+++ b/core/modules/update/tests/src/Functional/UpdateSemverCoreTest.php
@@ -99,10 +99,12 @@ public function testSecurityCoverageMessage($installed_version, $fixture, $requi
    * - drupal.sec.2.0_9.0.0.xml
    *   - 8.2.0
    *   - 9.0.0
-   * - drupal.sec.9.0.xml
-   *   - 8.9.0
-   * - drupal.sec.9.9.0.xml
-   *   - 9.9.0
+   * - drupal.sec.9.5.0.xml
+   *   - 9.4.0
+   *   - 9.5.0
+   * - drupal.sec.10.5.0.xml
+   *   - 10.4.0
+   *   - 10.5.0
    */
   public function securityCoverageMessageProvider() {
     $release_coverage_message = 'Visit the release cycle overview for more information on supported releases.';
@@ -182,78 +184,88 @@ public function securityCoverageMessageProvider() {
       ],
     ];
 
-    // Drupal 8.8.x test cases.
+    // Drupal 9.4.x test cases.
     $test_cases += [
-      // Ensure that a message is displayed during 8.8's active support.
-      '8.8.0, supported' => [
-        'installed_version' => '8.8.0',
-        'fixture' => 'sec.9.0',
+      // Ensure that a message is displayed during 9.4's active support.
+      '9.4.0, supported' => [
+        'installed_version' => '9.4.0',
+        'fixture' => 'sec.9.5.0',
         'requirements_section_heading' => 'Checked',
-        'message' => "Covered until 2020-Dec-02 $release_coverage_message",
-        'mock_date' => '2020-06-01',
+        'message' => "Covered until 2023-Jun-21 $release_coverage_message",
+        'mock_date' => '2022-12-13',
       ],
       // Ensure a warning is displayed if less than six months remain until the
-      // end of 8.8's security coverage.
-      '8.8.0, supported, 6 months warn' => [
-        'installed_version' => '8.8.0',
-        'fixture' => 'sec.9.0',
+      // end of 9.4's security coverage.
+      '9.4.0, supported, 6 months warn' => [
+        'installed_version' => '9.4.0',
+        'fixture' => 'sec.9.5.0',
         'requirements_section_heading' => 'Warnings found',
-        'message' => "Covered until 2020-Dec-02 $update_soon_message $release_coverage_message",
-        'mock_date' => '2020-06-02',
+        'message' => "Covered until 2023-Jun-21 $update_soon_message $release_coverage_message",
+        'mock_date' => '2022-12-14',
       ],
     ];
     // Ensure that the message does not change, including on the last day of
     // security coverage.
-    $test_cases['8.8.0, supported, last day warn'] = $test_cases['8.8.0, supported, 6 months warn'];
-    $test_cases['8.8.0, supported, last day warn']['mock_date'] = '2020-12-01';
+    $test_cases['9.4.0, supported, last day warn'] = $test_cases['9.4.0, supported, 6 months warn'];
+    $test_cases['9.4.0, supported, last day warn']['mock_date'] = '2023-06-20';
 
-    // Ensure that if the 8.8 support window is finished a message is
+    // Ensure that if the 9.4 support window is finished a message is
     // displayed.
-    $test_cases['8.8.0, support over'] = [
-      'installed_version' => '8.8.0',
-      'fixture' => 'sec.9.0',
+    $test_cases['9.4.0, support over'] = [
+      'installed_version' => '9.4.0',
+      'fixture' => 'sec.9.5.0',
       'requirements_section_heading' => 'Errors found',
       'message' => "$coverage_ended_message $update_asap_message $release_coverage_message",
-      'mock_date' => '2020-12-02',
+      'mock_date' => '2023-06-22',
     ];
 
-    // Drupal 8.9 LTS test cases.
-    $test_cases['8.9.0, lts supported'] = [
-      'installed_version' => '8.9.0',
-      'fixture' => 'sec.9.0',
+    // Drupal 9.5 test cases.
+    $test_cases['9.5.0, supported'] = [
+      'installed_version' => '9.5.0',
+      'fixture' => 'sec.9.5.0',
       'requirements_section_heading' => 'Checked',
-      'message' => "Covered until 2021-Nov $release_coverage_message",
-      'mock_date' => '2021-01-01',
+      'message' => "Covered until 2023-Nov $release_coverage_message",
+      'mock_date' => '2023-01-01',
     ];
+    // Ensure a warning is displayed if less than six months remain until the
+    // end of 9.5's security coverage.
+    $test_cases['9.5.0, supported, 6 months warn'] = [
+      'installed_version' => '9.5.0',
+      'fixture' => 'sec.9.5.0',
+      'requirements_section_heading' => 'Warnings found',
+      'message' => "Covered until 2023-Nov $update_soon_message $release_coverage_message",
+      'mock_date' => '2023-05-15',
+    ];
+
     // Ensure that the message does not change, including on the last day of
     // security coverage.
-    $test_cases['8.9.0, lts supported, last day'] = $test_cases['8.9.0, lts supported'];
-    $test_cases['8.9.0, lts supported, last day']['mock_date'] = '2021-10-31';
+    $test_cases['9.5.0, supported, last day warn'] = $test_cases['9.5.0, supported, 6 months warn'];
+    $test_cases['9.5.0, supported, last day warn']['mock_date'] = '2023-10-31';
 
-    // Ensure that if LTS support window is finished a message is displayed.
-    $test_cases['8.9.0, lts support over'] = [
-      'installed_version' => '8.9.0',
-      'fixture' => 'sec.9.0',
+    // Ensure that if the support window is finished a message is displayed.
+    $test_cases['9.5.0, support over'] = [
+      'installed_version' => '9.5.0',
+      'fixture' => 'sec.9.5.0',
       'requirements_section_heading' => 'Errors found',
       'message' => "$coverage_ended_message $update_asap_message $release_coverage_message",
-      'mock_date' => '2021-11-01',
+      'mock_date' => '2023-11-01',
     ];
 
     // Drupal 9 test cases.
     $test_cases += [
-      // Ensure the end dates for 8.8 and 8.9 only apply to major version 8.
-      '9.9.0' => [
-        'installed_version' => '9.9.0',
-        'fixture' => 'sec.9.9.0',
+      // Ensure the end dates for 9.4 and 9.5 only apply to major version 9.
+      '10.5.0' => [
+        'installed_version' => '10.5.0',
+        'fixture' => 'sec.10.5.0',
         'requirements_section_heading' => 'Checked',
-        'message' => "Covered until 9.11.0 $release_coverage_message",
+        'message' => "Covered until 10.7.0 $release_coverage_message",
         'mock_date' => '',
       ],
-      '9.8.0' => [
-        'installed_version' => '9.8.0',
-        'fixture' => 'sec.9.9.0',
+      '10.4.0' => [
+        'installed_version' => '10.4.0',
+        'fixture' => 'sec.10.5.0',
         'requirements_section_heading' => 'Warnings found',
-        'message' => "Covered until 9.10.0 Update to 9.9 or higher soon to continue receiving security updates. $release_coverage_message",
+        'message' => "Covered until 10.6.0 Update to 10.5 or higher soon to continue receiving security updates. $release_coverage_message",
         'mock_date' => '',
       ],
     ];