diff --git a/build.gradle b/build.gradle
index 912210f52c..9f954c2bc9 100644
--- a/build.gradle
+++ b/build.gradle
@@ -20,7 +20,7 @@ plugins {
 	id 'net.fabricmc.filament'
 }
 
-def minecraft_version = "1.20.5-pre4"
+def minecraft_version = "1.20.5-rc1"
 
 filament {
 	minecraftVersion = minecraft_version
diff --git a/mappings/net/minecraft/datafixer/fix/HorseArmorFix.mapping b/mappings/net/minecraft/datafixer/fix/HorseArmorFix.mapping
index 4c92fda64b..7d4fe91ba3 100644
--- a/mappings/net/minecraft/datafixer/fix/HorseArmorFix.mapping
+++ b/mappings/net/minecraft/datafixer/fix/HorseArmorFix.mapping
@@ -1,6 +1,6 @@
 CLASS net/minecraft/class_9183 net/minecraft/datafixer/fix/HorseArmorFix
 	FIELD field_48805 oldNbtKey Ljava/lang/String;
-	METHOD <init> (Lcom/mojang/datafixers/schemas/Schema;Ljava/lang/String;Ljava/lang/String;)V
+	METHOD <init> (Lcom/mojang/datafixers/schemas/Schema;Ljava/lang/String;Ljava/lang/String;Z)V
 		ARG 1 outputSchema
 		ARG 2 entityId
 		ARG 3 oldNbtKey