diff --git a/src/Composer/Util/ErrorHandler.php b/src/Composer/Util/ErrorHandler.php
index fbd92843d..d06b57718 100644
--- a/src/Composer/Util/ErrorHandler.php
+++ b/src/Composer/Util/ErrorHandler.php
@@ -78,7 +78,7 @@ class ErrorHandler
     public static function register(?IOInterface $io = null): void
     {
         set_error_handler([__CLASS__, 'handle']);
-        error_reporting(E_ALL | E_STRICT);
+        error_reporting(E_ALL);
         self::$io = $io;
     }
 }
diff --git a/src/Composer/Util/Silencer.php b/src/Composer/Util/Silencer.php
index f2b9f73fc..6dd0efb34 100644
--- a/src/Composer/Util/Silencer.php
+++ b/src/Composer/Util/Silencer.php
@@ -33,7 +33,7 @@ class Silencer
     public static function suppress(?int $mask = null): int
     {
         if (!isset($mask)) {
-            $mask = E_WARNING | E_NOTICE | E_USER_WARNING | E_USER_NOTICE | E_DEPRECATED | E_USER_DEPRECATED | E_STRICT;
+            $mask = E_WARNING | E_NOTICE | E_USER_WARNING | E_USER_NOTICE | E_DEPRECATED | E_USER_DEPRECATED;
         }
         $old = error_reporting();
         self::$stack[] = $old;