diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 1a52013..1a1358a 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -10,14 +10,14 @@ jobs:
       matrix:
         os: [ ubuntu-latest, windows-latest ]
         php: [ 7.2.5, 8.0 ]
-        laravel: [ 6.*, 8.*, 9.0 ]
+        laravel: [ 6.*, 8.*, ^9.33 ]
         testbench: [ ^4.0, ^6.6, ^7.0 ]
         stability: [ prefer-lowest, prefer-stable ]
         exclude:
           - php: 7.2.5
             laravel: 8.*
           - php: 7.2.5
-            laravel: 9.0
+            laravel: ^9.33
           - php: 7.2.5
             testbench: ^6.6
           - php: 7.2.5
@@ -30,9 +30,9 @@ jobs:
             testbench: ^4.0
           - laravel: 8.*
             testbench: ^7.0
-          - laravel: 9.0
+          - laravel: ^9.33
             testbench: ^4.0
-          - laravel: 9.0
+          - laravel: ^9.33
             testbench: ^6.6
 
     name: php-${{ matrix.php }} - laravel-${{ matrix.laravel }} - testbench-${{ matrix.testbench }} - ${{ matrix.stability }} - ${{ matrix.os }}
diff --git a/README.md b/README.md
index 30330d6..995ee81 100644
--- a/README.md
+++ b/README.md
@@ -142,6 +142,13 @@ In this case translation strings will be generated for the language specified in
 
 > Note: Strings you have already translated will not be overwritten.
 
+### Remove Missing Keys
+
+By default, the strings inside the locale files will be preserved even if they are not present the next time you run the localize command.
+If you want to remove those keys that are not present in your files anymore you can append the --remove-missing option to the localize command.
+``` bash
+php artisan localize --remove-missing
+```
 ### Key Sorting
 
 By default, the strings generated inside those JSON files will be sorted alphabetically by their keys.
diff --git a/src/Collections/DefaultKeyCollection.php b/src/Collections/DefaultKeyCollection.php
index 4cebbd0..8040745 100644
--- a/src/Collections/DefaultKeyCollection.php
+++ b/src/Collections/DefaultKeyCollection.php
@@ -24,4 +24,13 @@ public function merge($items): self
     {
         return parent::merge(Arr::dot($items));
     }
+
+    /**
+     * @param mixed $items
+     * @return static
+     */
+    public function intersectByKeys($items): self
+    {
+        return new self(collect(Arr::dot($this))->intersectByKeys($items));
+    }
 }
diff --git a/src/Commands/LocalizeCommand.php b/src/Commands/LocalizeCommand.php
index 2592cfb..d245caf 100644
--- a/src/Commands/LocalizeCommand.php
+++ b/src/Commands/LocalizeCommand.php
@@ -16,7 +16,7 @@ class LocalizeCommand extends Command
      *
      * @var string
      */
-    protected $signature = 'localize {lang?}';
+    protected $signature = 'localize {lang?} {--remove-missing}';
 
     /**
      * The console command description.
@@ -53,7 +53,12 @@ public function handle(Localizator $localizator, Parser $parser): int
             $progressBar->setMessage("Localizing {$locale}...");
 
             foreach ($this->getTypes() as $type) {
-                $localizator->localize($parser->getKeys($locale, $type), $type, $locale);
+                $localizator->localize(
+                    $parser->getKeys($locale, $type),
+                    $type,
+                    $locale,
+                    $this->option('remove-missing')
+                );
             }
 
             $progressBar->advance();
diff --git a/src/Services/Localizator.php b/src/Services/Localizator.php
index ab9373e..5bcc785 100644
--- a/src/Services/Localizator.php
+++ b/src/Services/Localizator.php
@@ -14,9 +14,9 @@ class Localizator
      * @param string $locale
      * @return void
      */
-    public function localize(Translatable $keys, string $type, string $locale): void
+    public function localize(Translatable $keys, string $type, string $locale, bool $removeMissing): void
     {
-        $this->getWriter($type)->put($locale, $this->collect($keys, $type, $locale));
+        $this->getWriter($type)->put($locale, $this->collect($keys, $type, $locale, $removeMissing));
     }
 
     /**
@@ -25,13 +25,15 @@ public function localize(Translatable $keys, string $type, string $locale): void
      * @param string $locale
      * @return Translatable
      */
-    protected function collect(Translatable $keys, string $type, string $locale): Translatable
+    protected function collect(Translatable $keys, string $type, string $locale, bool $removeMissing): Translatable
     {
         return $keys
-            ->merge($this->getCollector($type)->getTranslated($locale))
-            ->when(config('localizator.sort'), function (Translatable $keyCollection) {
-                return $keyCollection->sortAlphabetically();
-            });
+            ->merge($this->getCollector($type)->getTranslated($locale)
+                ->when($removeMissing, function (Translatable $keyCollection) use ($keys) {
+                    return $keyCollection->intersectByKeys($keys);
+                }))->when(config('localizator.sort'), function (Translatable $keyCollection) {
+                    return $keyCollection->sortAlphabetically();
+                });
     }
 
     /**
diff --git a/tests/LocalizatorTest.php b/tests/LocalizatorTest.php
index 788c6b9..8c80be5 100644
--- a/tests/LocalizatorTest.php
+++ b/tests/LocalizatorTest.php
@@ -295,4 +295,42 @@ public function testIntTranslationNestedKeysAreBeingSavedAsStrings(): void
 
         $this->assertSame(preg_replace('/\r\n|\r|\n/', "\n", $expected), $contents);
     }
+
+    public function testRemoveMissingKeys(): void
+    {
+        self::flushDirectories('lang', 'views');
+
+        $this->createTestDefaultLangFile([
+            'missingstring' => 'Missing',
+            'name' => 'Name',
+        ], 'app', 'en');
+        $this->createTestJsonLangFile([
+            'Login' => 'Login',
+            'Missing' => 'Missing',
+        ], 'en');
+
+        $enDefaultContents = $this->getDefaultLangContents('en', 'app');
+        $enJsonContents = $this->getJsonLangContents('en');
+        self::assertSame(['missingstring' => 'Missing', 'name' => 'Name'], $enDefaultContents);
+        self::assertSame(['Login' => 'Login', 'Missing' => 'Missing'], $enJsonContents);
+
+        $this->createTestView("{{ __('Login') }} {{ __('app.name') }}");
+
+        // Run the command with the option to remove keys/strings that are not present anymore
+        $this->artisan('localize en --remove-missing')
+            ->assertExitCode(0);
+
+        // Do created locale files exist?
+        self::assertDefaultLangFilesExist('en', ['app']);
+        self::assertJsonLangFilesExist('en');
+
+        // Do their contents match the expected results?
+        $enDefaultContents = $this->getDefaultLangContents('en', 'app');
+        $enJsonContents = $this->getJsonLangContents('en');
+        self::assertSame(['name' => 'Name'], $enDefaultContents);
+        self::assertSame(['Login' => 'Login'], $enJsonContents);
+
+        // Cleanup.
+        self::flushDirectories('lang', 'views');
+    }
 }
diff --git a/tests/TestCase.php b/tests/TestCase.php
index ee32597..a320b19 100644
--- a/tests/TestCase.php
+++ b/tests/TestCase.php
@@ -23,17 +23,6 @@ public function setUp(): void
         parent::setUp();
     }
 
-    /**
-     * This method is called after the last test of this test class is run.
-     *
-     * @return void
-     */
-    public static function tearDownAfterClass(): void
-    {
-        // Flush one last time after all tests have finished running.
-        self::flushDirectories('lang', 'views');
-    }
-
     /**
      * Get package providers.
      *