diff --git a/.github/workflows/phpstan.yaml b/.github/workflows/phpstan.yaml
new file mode 100644
index 0000000..978d955
--- /dev/null
+++ b/.github/workflows/phpstan.yaml
@@ -0,0 +1,21 @@
+---
+name: PHPStan
+
+on: [push, pull_request]
+
+permissions: {}
+
+jobs:
+  phpstan:
+    runs-on: ubuntu-latest
+    timeout-minutes: 5
+    steps:
+      - uses: actions/checkout@v6
+      - uses: shivammathur/setup-php@v2
+        with:
+          php-version: "7.4"
+          tools: composer:v2
+      - name: Install Dependencies
+        run: COMPOSER=composer.phpstan.json composer install --no-ansi --no-interaction --no-progress
+      - name: Run PHPStan
+        run: vendor-phpstan/bin/phpstan analyse
diff --git a/.gitignore b/.gitignore
index d769eb5..3194274 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,5 @@
 vendor
+vendor-phpstan
 .phpunit.result.cache
 composer.lock
+composer.phpstan.lock
diff --git a/composer.phpstan.json b/composer.phpstan.json
new file mode 100644
index 0000000..223a3cf
--- /dev/null
+++ b/composer.phpstan.json
@@ -0,0 +1,9 @@
+{
+  "description": "composer for PHPStan to still support php5.4 and higher in the main composer file",
+  "config": {
+    "vendor-dir": "vendor-phpstan"
+  },
+  "require": {
+    "phpstan/phpstan": "^2.1"
+  }
+}
diff --git a/lib/Tinify.php b/lib/Tinify.php
index 80f533f..33c404f 100644
--- a/lib/Tinify.php
+++ b/lib/Tinify.php
@@ -53,15 +53,15 @@ public static function setClient($client) {
 }
 
 function setKey($key) {
-    return Tinify::setKey($key);
+    Tinify::setKey($key);
 }
 
 function setAppIdentifier($appIdentifier) {
-    return Tinify::setAppIdentifier($appIdentifier);
+    Tinify::setAppIdentifier($appIdentifier);
 }
 
 function setProxy($proxy) {
-    return Tinify::setProxy($proxy);
+    Tinify::setProxy($proxy);
 }
 
 function getCompressionCount() {
diff --git a/lib/Tinify/Client.php b/lib/Tinify/Client.php
index 0d8ed0c..1bc0690 100644
--- a/lib/Tinify/Client.php
+++ b/lib/Tinify/Client.php
@@ -87,7 +87,7 @@ function request($method, $url, $body = NULL) {
             }
 
             $request = curl_init();
-            if ($request === false || $request === null) {
+            if ($request === false) {
                 throw new ConnectionException(
                     "Error while connecting: curl extension is not functional or disabled."
                 );
@@ -153,6 +153,7 @@ function request($method, $url, $body = NULL) {
                 throw new ConnectionException("Error while connecting: " . $message);
             }
         }
+        throw new ConnectionException("Error while connecting: max retries exceeded");
     }
 
     protected static function parseHeaders($headers) {
diff --git a/phpstan.neon b/phpstan.neon
new file mode 100644
index 0000000..d6b47fe
--- /dev/null
+++ b/phpstan.neon
@@ -0,0 +1,5 @@
+parameters:
+    phpVersion: 70100
+    level: 5
+    paths:
+        - lib