diff -up ./src/ProxyManager/Generator/Util/IdentifierSuffixer.php.rpm ./src/ProxyManager/Generator/Util/IdentifierSuffixer.php
--- ./src/ProxyManager/Generator/Util/IdentifierSuffixer.php.rpm	2017-11-17 13:44:40.268314310 +0100
+++ ./src/ProxyManager/Generator/Util/IdentifierSuffixer.php	2017-11-17 13:47:14.351074468 +0100
@@ -4,8 +4,6 @@ declare(strict_types=1);
 
 namespace ProxyManager\Generator\Util;
 
-use PackageVersions\Versions;
-
 /**
  * Utility class capable of generating
  * valid class/property/method identifiers
@@ -45,6 +43,6 @@ abstract class IdentifierSuffixer
 
     private static function loadBaseHashSalt() : string
     {
-        return \sha1(\serialize(Versions::VERSIONS));
+        return \sha1_file(__FILE__);
     }
 }
diff -up ./src/ProxyManager/Version.php.rpm ./src/ProxyManager/Version.php
--- ./src/ProxyManager/Version.php.rpm	2017-11-17 13:11:06.000000000 +0100
+++ ./src/ProxyManager/Version.php	2017-11-17 13:43:57.787104733 +0100
@@ -4,8 +4,6 @@ declare(strict_types=1);
 
 namespace ProxyManager;
 
-use PackageVersions\Versions;
-
 /**
  * Version class - to be adjusted when a new release is created.
  *
@@ -33,6 +31,6 @@ final class Version
      */
     public static function getVersion() : string
     {
-        return Versions::getVersion('ocramius/proxy-manager');
+        return '@VERSION@@@COMMIT@';
     }
 }
diff -up ./tests/ProxyManagerTest/Generator/Util/IdentifierSuffixerTest.php.rpm ./tests/ProxyManagerTest/Generator/Util/IdentifierSuffixerTest.php
--- ./tests/ProxyManagerTest/Generator/Util/IdentifierSuffixerTest.php.rpm	2017-11-17 13:44:45.583340528 +0100
+++ ./tests/ProxyManagerTest/Generator/Util/IdentifierSuffixerTest.php	2017-11-17 13:47:06.259034546 +0100
@@ -4,7 +4,6 @@ declare(strict_types=1);
 
 namespace ProxyManagerTest\Generator\Util;
 
-use PackageVersions\Versions;
 use PHPUnit\Framework\TestCase;
 use ProxyManager\Generator\Util\IdentifierSuffixer;
 
@@ -36,7 +35,7 @@ class IdentifierSuffixerTest extends Tes
     public function testGeneratedSuffixDependsOnPackageInstalledVersions(string $name) : void
     {
         self::assertStringEndsWith(
-            \substr(sha1($name . sha1(serialize(Versions::VERSIONS))), 0, 5),
+            \substr(sha1($name . sha1_file(__DIR__ . '/../../../../src/ProxyManager/Generator/Util/IdentifierSuffixer.php')), 0, 5),
             IdentifierSuffixer::getIdentifier($name)
         );
     }