diff --git a/bin/update-release-version.php b/bin/update-release-version.php
index 9731cdd13..d9187f614 100755
--- a/bin/update-release-version.php
+++ b/bin/update-release-version.php
@@ -17,6 +17,7 @@ function usage()
     to-stable:          Mark the current version as stable
     to-next-patch-dev:  Update to the next patch development version
     to-next-minor-dev:  Update to the next minor development version
+    to-next-major-dev:  Update to the next major development version
     get-version:        Print the current version number
 
 EOT;
@@ -167,6 +168,23 @@ function get_next_minor_version(array $versions): array
     ];
 }
 
+function get_next_major_version(array $versions): array
+{
+    $versionComponents = $versions['versionComponents'];
+
+    // Increase major version, set other components to 0
+    $versionComponents[0] += 1;
+    $versionComponents[1] = 0;
+    $versionComponents[2] = 0;
+    $versionComponents[3] = 0;
+
+    return [
+        'version' => get_version_string_from_components($versionComponents) . 'dev',
+        'stability' => 'devel',
+        'versionComponents' => $versionComponents,
+    ];
+}
+
 function get_next_release_version(array $versions, string $releaseVersion): array
 {
     $releaseVersion = parse_release_version($releaseVersion);
@@ -244,6 +262,10 @@ function get_next_dev_version(array $versions): array
         $newVersion = get_next_minor_version($currentVersion);
         break;
 
+    case 'to-next-major-dev':
+        $newVersion = get_next_major_version($currentVersion);
+        break;
+
     default:
         usage();
 }
diff --git a/phongo_version.h b/phongo_version.h
index 38727ac5f..a0cd3a0cc 100644
--- a/phongo_version.h
+++ b/phongo_version.h
@@ -22,9 +22,9 @@
  * publishing a release. */
 
 /* clang-format off */
-#define PHP_MONGODB_VERSION "1.21.0dev"
+#define PHP_MONGODB_VERSION "2.0.0dev"
 #define PHP_MONGODB_STABILITY "devel"
-#define PHP_MONGODB_VERSION_DESC 1,21,0,0
+#define PHP_MONGODB_VERSION_DESC 2,0,0,0
 /* clang-format on */
 
 #endif /* PHONGO_VERSION_H */
diff --git a/tests/manager/manager-debug-001.phpt b/tests/manager/manager-debug-001.phpt
index cc4a81841..fa4789740 100644
--- a/tests/manager/manager-debug-001.phpt
+++ b/tests/manager/manager-debug-001.phpt
@@ -22,5 +22,5 @@ rmdir($name);
 <?php exit(0); ?>
 --EXPECTF--
 %A[%s]     PHONGO: DEBUG   > Connection string: '%s'
-[%s]     PHONGO: DEBUG   > Creating Manager, phongo-1.%d.%d%S[%s] - mongoc-1.%s(%s), libbson-1.%s(%s), php-%s
+[%s]     PHONGO: DEBUG   > Creating Manager, phongo-%d.%d.%d%S[%s] - mongoc-1.%s(%s), libbson-1.%s(%s), php-%s
 %A===DONE===%A
diff --git a/tests/manager/manager-debug-002.phpt b/tests/manager/manager-debug-002.phpt
index 470c3a540..89e882da2 100644
--- a/tests/manager/manager-debug-002.phpt
+++ b/tests/manager/manager-debug-002.phpt
@@ -12,5 +12,5 @@ $manager = new MongoDB\Driver\Manager;
 <?php exit(0); ?>
 --EXPECTF--
 %A[%s]     PHONGO: DEBUG   > Connection string: '%s'
-[%s]     PHONGO: DEBUG   > Creating Manager, phongo-1.%d.%d%S[%s] - mongoc-1.%s(%s), libbson-1.%s(%s), php-%s
+[%s]     PHONGO: DEBUG   > Creating Manager, phongo-%d.%d.%d%S[%s] - mongoc-1.%s(%s), libbson-1.%s(%s), php-%s
 %A===DONE===%A