diff --git a/src/EndpointIdentifier.php b/src/EndpointIdentifier.php
index ab26c60..e91a102 100644
--- a/src/EndpointIdentifier.php
+++ b/src/EndpointIdentifier.php
@@ -19,7 +19,7 @@ class EndpointIdentifier implements EndpointInterface
     public function __construct(string $method, string $version, string $package, ?string $apiAction = null)
     {
         $this->method = strtoupper($method);
-        if ($this->checkVersionFormat($version) === false) {
+        if (strpos($version, '/') !== false) {
             throw new InvalidArgumentException('Version must have semantic numbering. For example "1", "1.1", "0.13.2" etc.');
         }
         $this->version = $version;
@@ -54,9 +54,4 @@ public function getUrl(): string
     {
         return "v{$this->version}/{$this->package}/{$this->apiAction}";
     }
-
-    private function checkVersionFormat(string $version): bool
-    {
-        return (preg_match('/^(0|[1-9][0-9]*)(\.(0|[1-9][0-9]*)){0,2}$/', $version) === 1);
-    }
 }
diff --git a/tests/EndpoinIdentifierTest.php b/tests/EndpoinIdentifierTest.php
index 01a44fb..26d5c9f 100644
--- a/tests/EndpoinIdentifierTest.php
+++ b/tests/EndpoinIdentifierTest.php
@@ -36,11 +36,18 @@ public function testSimpleUrl()
 
     public function testSupportedVersions()
     {
-        new EndpointIdentifier('GET', '0', 'core', 'show');
-        new EndpointIdentifier('GET', '1', 'core', 'show');
-        new EndpointIdentifier('GET', '1.0', 'core', 'show');
-        new EndpointIdentifier('GET', '1.1', 'core', 'show');
-        new EndpointIdentifier('GET', '1.33', 'core', 'show');
+        $endpoint = new EndpointIdentifier('GET', '0', 'core', 'show');
+        $this->assertEquals('v0/core/show', $endpoint->getUrl());
+        $endpoint = new EndpointIdentifier('GET', '1', 'core', 'show');
+        $this->assertEquals('v1/core/show', $endpoint->getUrl());
+        $endpoint = new EndpointIdentifier('GET', '1.0', 'core', 'show');
+        $this->assertEquals('v1.0/core/show', $endpoint->getUrl());
+        $endpoint = new EndpointIdentifier('GET', '1.1', 'core', 'show');
+        $this->assertEquals('v1.1/core/show', $endpoint->getUrl());
+        $endpoint = new EndpointIdentifier('GET', '1.33', 'core', 'show');
+        $this->assertEquals('v1.33/core/show', $endpoint->getUrl());
+        $endpoint = new EndpointIdentifier('GET', '1.33-dev', 'core', 'show');
+        $this->assertEquals('v1.33-dev/core/show', $endpoint->getUrl());
         $endpoint = new EndpointIdentifier('GET', '0.33.43', 'core', 'show');
         $this->assertEquals('v0.33.43/core/show', $endpoint->getUrl());
     }
@@ -48,6 +55,6 @@ public function testSupportedVersions()
     public function testFailVersion()
     {
         $this->expectException(InvalidArgumentException::class);
-        new EndpointIdentifier('GET', 'test', 'core', 'show');
+        new EndpointIdentifier('GET', '1.0/dev', 'core', 'show');
     }
 }