diff --git a/src/BuildProcess/CompressApplication.php b/src/BuildProcess/CompressApplication.php
index 2c7dd4e..a16d04a 100644
--- a/src/BuildProcess/CompressApplication.php
+++ b/src/BuildProcess/CompressApplication.php
@@ -44,6 +44,8 @@ public function __invoke()
 
             $archive->addFile($file->getRealPath(), $relativePathName);
 
+            $archive->setCompressionName($relativePathName, ZipArchive::CM_DEFLATE, 9);
+
             $archive->setExternalAttributesName(
                 $relativePathName,
                 ZipArchive::OPSYS_UNIX,
@@ -63,7 +65,7 @@ public function __invoke()
      */
     protected function compressApplicationOnMac()
     {
-        (new Process(['zip', '-r', $this->buildPath.'/app.zip', '.'], $this->appPath))->mustRun();
+        (new Process(['zip', '-r -9', $this->buildPath.'/app.zip', '.'], $this->appPath))->mustRun();
     }
 
     /**
diff --git a/src/BuildProcess/CompressVendor.php b/src/BuildProcess/CompressVendor.php
index 816d6b8..9c2ee4e 100644
--- a/src/BuildProcess/CompressVendor.php
+++ b/src/BuildProcess/CompressVendor.php
@@ -38,6 +38,8 @@ public function __invoke()
 
             $archive->addFile($file->getRealPath(), $relativePathName);
 
+            $archive->setCompressionName($relativePathName, ZipArchive::CM_DEFLATE, 9);
+
             $archive->setExternalAttributesName(
                 $relativePathName,
                 ZipArchive::OPSYS_UNIX,
@@ -55,7 +57,7 @@ public function __invoke()
      */
     protected function compressOnMac()
     {
-        (new Process(['zip', '-r', $this->buildPath.'/vendor.zip', '.'], $this->vendorPath))->mustRun();
+        (new Process(['zip', '-r -9', $this->buildPath.'/vendor.zip', '.'], $this->vendorPath))->mustRun();
     }
 
     /**