diff --git a/fml/jsons/1.8.json b/fml/jsons/1.8.json
index eb6fe44567..809d1790c6 100644
--- a/fml/jsons/1.8.json
+++ b/fml/jsons/1.8.json
@@ -59,7 +59,7 @@
       "name": "com.google.code.gson:gson:2.2.4"
     },
     {
-      "name": "com.mojang:authlib:1.5.17"
+      "name": "com.mojang:authlib:1.5.21"
     },
     {
       "name": "com.mojang:realms:1.6.1"