diff --git a/job_creator.php b/job_creator.php
index c49dc81..9951218 100644
--- a/job_creator.php
+++ b/job_creator.php
@@ -52,7 +52,9 @@ public function getInstallerVersion(
             }
         }
         // hardcoded installer version for repo version
-        foreach (array_keys(INSTALLER_TO_REPO_MINOR_VERSIONS) as $installerVersion) {
+        $keys = array_keys(INSTALLER_TO_REPO_MINOR_VERSIONS);
+        $keys = array_reverse($keys);
+        foreach ($keys as $installerVersion) {
             foreach (INSTALLER_TO_REPO_MINOR_VERSIONS[$installerVersion] as $_repo => $_repoVersions) {
                 $repoVersions = is_array($_repoVersions) ? $_repoVersions : [$_repoVersions];
                 foreach ($repoVersions as $repoVersion) {
@@ -375,7 +377,7 @@ private function getListOfPhpVersionsByBranchName(): array
         $json = $this->getComposerJsonContent();
         if ($json) {
             $php = $json->require->php ?? null;
-            $php = str_replace('^', '', $php);
+            $php = str_replace('^', '', $php ?? '');
             $cmsMajors = array_keys(MetaData::PHP_VERSIONS_FOR_CMS_RELEASES);
             $cmsMajors = array_filter($cmsMajors, fn($v) => !str_contains($v, '.'));
             $cmsMajors = array_reverse($cmsMajors);
diff --git a/tests/JobCreatorTest.php b/tests/JobCreatorTest.php
index 570db2b..9a439ee 100644
--- a/tests/JobCreatorTest.php
+++ b/tests/JobCreatorTest.php
@@ -184,7 +184,7 @@ public function provideGetInstallerVersion(): array
             'html5-1' => ['myaccount/silverstripe-html5', '2', $nextMinorCms4],
             'html5-2' => ['myaccount/silverstripe-html5', '2.2', '4.10.x-dev'],
             'html5-3' => ['myaccount/silverstripe-html5', '2.3', '4.10.x-dev'],
-            'html5-4' => ['myaccount/silverstripe-html5', '2.4', '4.11.x-dev'],
+            'html5-4' => ['myaccount/silverstripe-html5', '2.4', '4.13.x-dev'],
             'html5-5' => ['myaccount/silverstripe-html5', 'burger', $currentMinorCms4],
             // force installer unlockedstepped repo
             'serve1' => ['myaccount/silverstripe-serve', '2', $nextMinorCms4],
@@ -1144,6 +1144,103 @@ public function provideCreateJson(): array
                     ],
                 ]
             ],
+            // test for graphql 5.2 which is used in both installer 5.3 and installer 5.2
+            // it should use installer 5.3.x-dev
+            [
+                implode("\n", [
+                    $this->getGenericYml(),
+                    <<<EOT
+                    github_repository: 'myaccount/silverstripe-graphql'
+                    github_my_ref: '5.2'
+                    parent_branch: ''
+                    EOT
+                ]),
+                false,
+                false,
+                false,
+                [
+                    [
+                        'installer_version' => '5.3.x-dev',
+                        'php' => '8.1',
+                        'db' => DB_MYSQL_57,
+                        'composer_require_extra' => '',
+                        'composer_args' => '--prefer-lowest',
+                        'name_suffix' => '',
+                        'phpunit' => 'true',
+                        'phpunit_suite' => 'all',
+                        'phplinting' => 'false',
+                        'phpcoverage' => 'false',
+                        'endtoend' => 'false',
+                        'endtoend_suite' => 'root',
+                        'endtoend_config' => '',
+                        'endtoend_tags' => '',
+                        'js' => 'false',
+                        'doclinting' => 'false',
+                        'needs_full_setup' => 'true',
+                        'name' => '8.1 prf-low mysql57 phpunit all',
+                    ],
+                    [
+                        'installer_version' => '5.3.x-dev',
+                        'php' => '8.2',
+                        'db' => DB_MARIADB,
+                        'composer_require_extra' => '',
+                        'composer_args' => '',
+                        'name_suffix' => '',
+                        'phpunit' => 'true',
+                        'phpunit_suite' => 'all',
+                        'phplinting' => 'false',
+                        'phpcoverage' => 'false',
+                        'endtoend' => 'false',
+                        'endtoend_suite' => 'root',
+                        'endtoend_config' => '',
+                        'endtoend_tags' => '',
+                        'js' => 'false',
+                        'doclinting' => 'false',
+                        'needs_full_setup' => 'true',
+                        'name' => '8.2 mariadb phpunit all',
+                    ],
+                    [
+                        'installer_version' => '5.3.x-dev',
+                        'php' => '8.3',
+                        'db' => DB_MYSQL_80,
+                        'composer_require_extra' => '',
+                        'composer_args' => '',
+                        'name_suffix' => '',
+                        'phpunit' => 'true',
+                        'phpunit_suite' => 'all',
+                        'phplinting' => 'false',
+                        'phpcoverage' => 'false',
+                        'endtoend' => 'false',
+                        'endtoend_suite' => 'root',
+                        'endtoend_config' => '',
+                        'endtoend_tags' => '',
+                        'js' => 'false',
+                        'doclinting' => 'false',
+                        'needs_full_setup' => 'true',
+                        'name' => '8.3 mysql80 phpunit all',
+                    ],
+                    [
+                        'installer_version' => '5.3.x-dev',
+                        'php' => '8.3',
+                        'db' => DB_MYSQL_84,
+                        'composer_require_extra' => '',
+                        'composer_args' => '',
+                        'name_suffix' => '',
+                        'phpunit' => 'true',
+                        'phpunit_suite' => 'all',
+                        'phplinting' => 'false',
+                        'phpcoverage' => 'false',
+                        'endtoend' => 'false',
+                        'endtoend_suite' => 'root',
+                        'endtoend_config' => '',
+                        'endtoend_tags' => '',
+                        'js' => 'false',
+                        'doclinting' => 'false',
+                        'needs_full_setup' => 'true',
+                        'name' => '8.3 mysql84 phpunit all',
+                    ],
+                ]
+            ],
         ];
     }