diff --git a/src/Command/RaiseToInstalledCommand.php b/src/Command/RaiseToInstalledCommand.php
index 43ad3b8..775ce2f 100644
--- a/src/Command/RaiseToInstalledCommand.php
+++ b/src/Command/RaiseToInstalledCommand.php
@@ -5,7 +5,6 @@
 namespace Rector\Jack\Command;
 
 use Nette\Utils\FileSystem;
-use Nette\Utils\Json;
 use Rector\Jack\ComposerProcessor\RaiseToInstalledComposerProcessor;
 use Symfony\Component\Console\Command\Command;
 use Symfony\Component\Console\Input\InputInterface;
@@ -51,16 +50,16 @@ protected function execute(InputInterface $input, OutputInterface $output): int
         Assert::fileExists($composerJsonFilePath);
         $composerJsonContents = FileSystem::read($composerJsonFilePath);
 
-        $raiseToInstalledResult = $this->raiseToInstalledComposerProcessor->process($composerJsonContents);
+        $changedPackageVersionsResult = $this->raiseToInstalledComposerProcessor->process($composerJsonContents);
 
-        $changedPackages = $raiseToInstalledResult->getChangedPackageVersions();
+        $changedPackages = $changedPackageVersionsResult->getChangedPackageVersions();
         if ($changedPackages === []) {
             $symfonyStyle->success('No changes made to "composer.json"');
             return self::SUCCESS;
         }
 
         if ($isDryRun === false) {
-            $changedComposerJsonContents = $raiseToInstalledResult->getComposerJsonContents();
+            $changedComposerJsonContents = $changedPackageVersionsResult->getComposerJsonContents();
             FileSystem::write($composerJsonFilePath, $changedComposerJsonContents . PHP_EOL, null);
         }
 
diff --git a/src/ComposerProcessor/OpenVersionsComposerProcessor.php b/src/ComposerProcessor/OpenVersionsComposerProcessor.php
index 0135386..ba09441 100644
--- a/src/ComposerProcessor/OpenVersionsComposerProcessor.php
+++ b/src/ComposerProcessor/OpenVersionsComposerProcessor.php
@@ -13,7 +13,7 @@
 /**
  * @see \Rector\Jack\Tests\ComposerProcessor\OpenVersionsComposerProcessor\OpenVersionsComposerProcessorTest
  */
-final class OpenVersionsComposerProcessor
+final readonly class OpenVersionsComposerProcessor
 {
     public function __construct(
         private NextVersionResolver $nextVersionResolver
diff --git a/src/ComposerProcessor/RaiseToInstalledComposerProcessor.php b/src/ComposerProcessor/RaiseToInstalledComposerProcessor.php
index a7ddb00..4165f8d 100644
--- a/src/ComposerProcessor/RaiseToInstalledComposerProcessor.php
+++ b/src/ComposerProcessor/RaiseToInstalledComposerProcessor.php
@@ -16,11 +16,11 @@
 /**
  * @see \Rector\Jack\Tests\ComposerProcessor\RaiseToInstalledComposerProcessor\RaiseToInstalledComposerProcessorTest
  */
-final class RaiseToInstalledComposerProcessor
+final readonly class RaiseToInstalledComposerProcessor
 {
     public function __construct(
-        private readonly VersionParser $versionParser,
-        private readonly InstalledVersionResolver $installedVersionResolver,
+        private VersionParser $versionParser,
+        private InstalledVersionResolver $installedVersionResolver,
     ) {
     }
 
@@ -39,6 +39,10 @@ public function process(string $composerJsonContents): ChangedPackageVersionsRes
                 continue;
             }
 
+            if ($this->shouldSkipPackageVersion($packageVersion)) {
+                continue;
+            }
+
             $installedVersion = $installedPackagesToVersions[$packageName];
 
             // special case for unions
@@ -119,4 +123,9 @@ public function process(string $composerJsonContents): ChangedPackageVersionsRes
 
         return new ChangedPackageVersionsResult($composerJsonContents, $changedPackageVersions);
     }
+
+    private function shouldSkipPackageVersion(string $packageVersion): bool
+    {
+        return str_contains($packageVersion, 'dev-');
+    }
 }
diff --git a/src/ValueObject/ChangedPackageVersion.php b/src/ValueObject/ChangedPackageVersion.php
index 54dabee..7a83ef0 100644
--- a/src/ValueObject/ChangedPackageVersion.php
+++ b/src/ValueObject/ChangedPackageVersion.php
@@ -4,7 +4,7 @@
 
 namespace Rector\Jack\ValueObject;
 
-final class ChangedPackageVersion
+final readonly class ChangedPackageVersion
 {
     public function __construct(
         private string $packageName,
diff --git a/src/ValueObject/ComposerProcessorResult/ChangedPackageVersionsResult.php b/src/ValueObject/ComposerProcessorResult/ChangedPackageVersionsResult.php
index 32de90e..dd493bb 100644
--- a/src/ValueObject/ComposerProcessorResult/ChangedPackageVersionsResult.php
+++ b/src/ValueObject/ComposerProcessorResult/ChangedPackageVersionsResult.php
@@ -7,7 +7,7 @@
 use Rector\Jack\ValueObject\ChangedPackageVersion;
 use Webmozart\Assert\Assert;
 
-final class ChangedPackageVersionsResult
+final readonly class ChangedPackageVersionsResult
 {
     /**
      * @param ChangedPackageVersion[] $changedPackageVersions
diff --git a/tests/ComposerProcessor/RaiseToInstalledComposerProcessor/Fixture/skip-dev.json b/tests/ComposerProcessor/RaiseToInstalledComposerProcessor/Fixture/skip-dev.json
new file mode 100644
index 0000000..9d2e743
--- /dev/null
+++ b/tests/ComposerProcessor/RaiseToInstalledComposerProcessor/Fixture/skip-dev.json
@@ -0,0 +1,5 @@
+{
+    "require": {
+        "illuminate/container": "dev-master"
+    }
+}
diff --git a/tests/ComposerProcessor/RaiseToInstalledComposerProcessor/RaiseToInstalledComposerProcessorTest.php b/tests/ComposerProcessor/RaiseToInstalledComposerProcessor/RaiseToInstalledComposerProcessorTest.php
index f987704..2eb0c5b 100644
--- a/tests/ComposerProcessor/RaiseToInstalledComposerProcessor/RaiseToInstalledComposerProcessorTest.php
+++ b/tests/ComposerProcessor/RaiseToInstalledComposerProcessor/RaiseToInstalledComposerProcessorTest.php
@@ -24,20 +24,28 @@ public function test(): void
     {
         $composerJsonContents = FileSystem::read(__DIR__ . '/Fixture/some-outdated-composer.json');
 
-        $raiseToInstalledResult = $this->raiseToInstalledComposerProcessor->process($composerJsonContents);
+        $changedPackageVersionsResult = $this->raiseToInstalledComposerProcessor->process($composerJsonContents);
 
-        $this->assertCount(1, $raiseToInstalledResult->getChangedPackageVersions());
+        $this->assertCount(1, $changedPackageVersionsResult->getChangedPackageVersions());
         $this->assertContainsOnlyInstancesOf(
             ChangedPackageVersion::class,
-            $raiseToInstalledResult->getChangedPackageVersions()
+            $changedPackageVersionsResult->getChangedPackageVersions()
         );
 
-        $changedPackageVersion = $raiseToInstalledResult->getChangedPackageVersions()[0];
+        $changedPackageVersion = $changedPackageVersionsResult->getChangedPackageVersions()[0];
 
         $this->assertSame('illuminate/container', $changedPackageVersion->getPackageName());
         $this->assertSame('^9.0', $changedPackageVersion->getOldVersion());
 
         // note: this might change in near future; improve to dynamic soon
-        $this->assertSame('^12.14', $changedPackageVersion->getNewVersion());
+        $this->assertStringStartsWith('^12.1', $changedPackageVersion->getNewVersion());
+    }
+
+    public function testSkipDev(): void
+    {
+        $composerJsonContents = FileSystem::read(__DIR__ . '/Fixture/skip-dev.json');
+        $changedPackageVersionsResult = $this->raiseToInstalledComposerProcessor->process($composerJsonContents);
+
+        $this->assertEmpty($changedPackageVersionsResult->getChangedPackageVersions());
     }
 }