diff --git a/src/main/java/net/minecraftforge/fml/LaunchTesting.java b/src/main/java/net/minecraftforge/fml/LaunchTesting.java
index 5ee585eec..acd72d0f7 100644
--- a/src/main/java/net/minecraftforge/fml/LaunchTesting.java
+++ b/src/main/java/net/minecraftforge/fml/LaunchTesting.java
@@ -63,7 +63,7 @@ public class LaunchTesting
             launchArgs = ObjectArrays.concat(launchArgs, new String[] {
                             "--accessToken", "blah",
                             "--version", "FMLDev",
-                            "--assetIndex", "1.13",
+                            "--assetIndex", "1.13.1",
                             "--assetsDir", assets,
                             "--userProperties", "{}"
             }, String.class);
diff --git a/src/userdev/java/net/minecraftforge/userdev/UserdevLauncher.java b/src/userdev/java/net/minecraftforge/userdev/UserdevLauncher.java
index 36413cb04..736bea16a 100644
--- a/src/userdev/java/net/minecraftforge/userdev/UserdevLauncher.java
+++ b/src/userdev/java/net/minecraftforge/userdev/UserdevLauncher.java
@@ -65,7 +65,7 @@ public class UserdevLauncher
             launchArgs = ObjectArrays.concat(launchArgs, new String[] {
                     "--accessToken", "blah",
                     "--version", "FMLDev",
-                    "--assetIndex", "1.13",
+                    "--assetIndex", "1.13.1",
                     "--assetsDir", assets,
                     "--userProperties", "{}"
             }, String.class);