diff --git a/.github/workflows/php.yml b/.github/workflows/php.yml
index c7ea176..473a37b 100644
--- a/.github/workflows/php.yml
+++ b/.github/workflows/php.yml
@@ -9,15 +9,15 @@ jobs:
     strategy:
       matrix:
         operating-system: [ubuntu-latest, macOS-latest]
-        php-versions: ['7.2', '7.3', '7.4']
+        php-versions: ['7.3', '7.4', '8.0']
     name: PHP ${{ matrix.php-versions }} Test on ${{ matrix.operating-system }}
 
     steps:
     - name: Checkout
-      uses: actions/checkout@v1
+      uses: actions/checkout@v2
 
     - name: Setup PHP
-      uses: shivammathur/setup-php@v1
+      uses: shivammathur/setup-php@v2
       with:
         php-version: ${{ matrix.php-versions }}
         extensions: mbstring, intl
@@ -26,23 +26,18 @@ jobs:
       id: composer-cache
       run: echo "::set-output name=dir::$(composer config cache-files-dir)"
 
-    - name: Cache composer dependencies
-      uses: actions/cache@v1
+    - name: Cache dependencies
+      uses: actions/cache@v2
       with:
         path: ${{ steps.composer-cache.outputs.dir }}
-        # Use composer.json for key, if composer.lock is not committed.
-        # key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.json') }}
         key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
         restore-keys: ${{ runner.os }}-composer-
 
-    - name: Validate composer.json and composer.lock
-      run: composer validate
-
     - name: Install dependencies
-      run: composer install --prefer-dist --no-progress --no-suggest --optimize-autoloader
+      run: composer install --prefer-dist
 
     - name: Run test suite
       run: composer run-script test
-  
+
     - name: Run style-checking
       run: composer run-script check-style
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8851897..ad64bd5 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 ## [v5.0.0](https://github.com/elforastero/transliterate/releases/tag/2.0.0)
 - Support for Laravel 8
+- Drop support of php7.2
 - Require phpunit >= 9
 
 ## [v4.0.0](https://github.com/elforastero/transliterate/releases/tag/2.0.0)
diff --git a/composer.json b/composer.json
index a358fef..085d4df 100644
--- a/composer.json
+++ b/composer.json
@@ -21,7 +21,7 @@
     }
   },
   "require": {
-    "php": ">=7.2",
+    "php": ">=7.3",
     "ext-intl": "*",
     "illuminate/support": "^6.0|^7.0|^8.0"
   },
diff --git a/src/Facade.php b/src/Facade.php
index 59f0d78..5cce92c 100644
--- a/src/Facade.php
+++ b/src/Facade.php
@@ -14,7 +14,7 @@ class Facade extends BaseFacade
     /**
      * @return string
      */
-    public static function getFacadeAccessor()
+    public static function getFacadeAccessor(): string
     {
         return 'Transliterate';
     }
diff --git a/src/ServiceProvider.php b/src/ServiceProvider.php
index 3f97b80..4f1fd69 100644
--- a/src/ServiceProvider.php
+++ b/src/ServiceProvider.php
@@ -40,9 +40,9 @@ public function register()
     }
 
     /**
-     * @return array
+     * @return string[]
      */
-    public function provides()
+    public function provides(): array
     {
         return ['Transliterate'];
     }
diff --git a/src/Transformer.php b/src/Transformer.php
index d594126..34b75b5 100644
--- a/src/Transformer.php
+++ b/src/Transformer.php
@@ -12,7 +12,7 @@
 final class Transformer
 {
     /**
-     * @var array
+     * @var string[]
      */
     private static $stack = [];
 
@@ -29,7 +29,7 @@ public static function register(callable $callback): void
     /**
      * Get an array of all registered callbacks.
      *
-     * @return array<callable>
+     * @return callable[]
      */
     public static function getAll(): array
     {
@@ -40,7 +40,7 @@ public static function getAll(): array
      * Override closures stack.
      * For testing purposes only.
      *
-     * @param array $stack
+     * @param string[] $stack
      */
     public static function override(array $stack): void
     {
diff --git a/src/Transliterator.php b/src/Transliterator.php
index a77c57f..989f3f4 100644
--- a/src/Transliterator.php
+++ b/src/Transliterator.php
@@ -105,8 +105,6 @@ public function slugify(string $text): string
 
     /**
      * Get map array according to config file.
-     *
-     * @return array
      */
     private function getMap(): array
     {