diff --git a/composer.json b/composer.json
index c5bb18b..09733e0 100644
--- a/composer.json
+++ b/composer.json
@@ -17,6 +17,6 @@
         "php-vfs/php-vfs": "~1.2"
     },
     "require": {
-        "psr/log": "~1.0"
+        "psr/log": "^1.0|^3.0"
     }
 }