diff --git a/plugins/kolab_sso/composer.json b/plugins/kolab_sso/composer.json
index 4b2185fc..01e247d0 100644
--- a/plugins/kolab_sso/composer.json
+++ b/plugins/kolab_sso/composer.json
@@ -22,6 +22,6 @@
         "php": ">=5.3.0",
         "roundcube/plugin-installer": ">=0.1.3",
         "kolab/libkolab": ">=3.4.0",
-        "pear/http_request2": "~2.3.0"
+        "pear/http_request2": "~2.5.0"
     }
 }