diff --git a/composer.json b/composer.json
index d6ed0d5..6f5af8f 100644
--- a/composer.json
+++ b/composer.json
@@ -23,7 +23,7 @@
      "require": {
         "php": ">=5.6",
         "psr/cache": "^1",
-        "psr/log": "^1",
+        "psr/log": "^1|^2|^3",
         "php-http/client-implementation": "^1.0",
         "php-http/httplug": "^1.0|^2.0",
         "php-http/discovery": "^1.0",