diff --git a/worldedit-core/build.gradle b/worldedit-core/build.gradle
index 079e3c124..ac79454fd 100644
--- a/worldedit-core/build.gradle
+++ b/worldedit-core/build.gradle
@@ -5,7 +5,7 @@ dependencies {
     compile 'de.schlichtherle:truezip:6.8.3'
     compile 'rhino:js:1.7R2'
     compile 'org.yaml:snakeyaml:1.9'
-    compile 'com.google.guava:guava:17.0'
+    compile 'com.google.guava:guava:21.0'
     compile 'com.sk89q:jchronic:0.2.4a'
     compile 'com.google.code.findbugs:jsr305:1.3.9'
     compile 'com.thoughtworks.paranamer:paranamer:2.6'
diff --git a/worldedit-forge/build.gradle b/worldedit-forge/build.gradle
index 99f981f45..cf8de1a5b 100644
--- a/worldedit-forge/build.gradle
+++ b/worldedit-forge/build.gradle
@@ -13,12 +13,21 @@ buildscript {
 
 apply plugin: 'net.minecraftforge.gradle.forge'
 
+configurations.all {
+    resolutionStrategy {
+        force 'org.ow2.asm:asm:5.2'
+    }
+}
+
 dependencies {
     compile project(':worldedit-core')
-    compile 'org.spongepowered:spongeapi:3.1.0-SNAPSHOT'
+    compile 'org.spongepowered:spongeapi:6.0.0-SNAPSHOT'
     testCompile group: 'org.mockito', name: 'mockito-core', version: '1.9.0-rc1'
 }
 
+sourceCompatibility = 1.8
+targetCompatibility = 1.8
+
 repositories {
     maven {
         name = "Sponge"
@@ -26,11 +35,11 @@ repositories {
     }
 }
 
-ext.forgeVersion = "14.21.1.2443"
+ext.forgeVersion = "14.22.0.2456"
 
 minecraft {
-    version = "1.12-${project.forgeVersion}"
-    mappings = "snapshot_20170801"
+    version = "1.12.1-${project.forgeVersion}"
+    mappings = "snapshot_20170815"
     runDir = 'run'
 
     replaceIn "com/sk89q/worldedit/forge/ForgeWorldEdit.java"
diff --git a/worldedit-forge/src/main/java/com/sk89q/worldedit/forge/ForgeWorldEdit.java b/worldedit-forge/src/main/java/com/sk89q/worldedit/forge/ForgeWorldEdit.java
index ac575345b..3f4efbb14 100644
--- a/worldedit-forge/src/main/java/com/sk89q/worldedit/forge/ForgeWorldEdit.java
+++ b/worldedit-forge/src/main/java/com/sk89q/worldedit/forge/ForgeWorldEdit.java
@@ -63,10 +63,6 @@ import static com.google.common.base.Preconditions.checkNotNull;
  */
 @Mod(modid = ForgeWorldEdit.MOD_ID, name = "WorldEdit", version = "%VERSION%", acceptableRemoteVersions = "*")
 public class ForgeWorldEdit {
-    
-    static {
-        Java8Detector.notifyIfNot8();
-    }
 
     public static Logger logger;
     public static final String MOD_ID = "worldedit";