diff --git a/build.gradle b/build.gradle
index 5a2ba1d75..34add30a6 100644
--- a/build.gradle
+++ b/build.gradle
@@ -26,7 +26,7 @@ group = "org.squiddev"
 archivesBaseName = "cc-tweaked"
 
 minecraft {
-    version = "1.12-14.21.1.2387"
+    version = "1.12.2-14.23.2.2634"
     runDir = "run"
     replace '${version}', project.version
 
@@ -35,7 +35,7 @@ minecraft {
     // stable_#            stables are built at the discretion of the MCP team.
     // Use non-default mappings at your own risk. they may not allways work.
     // simply re-run your setup task after changing the mappings to update your workspace.
-    mappings = "snapshot_20170629"
+    mappings = "snapshot_20180324"
     // makeObfSourceJar = false // an Srg named sources jar is made by default. uncomment this to disable.
 }
 
@@ -56,8 +56,8 @@ configurations {
 }
 
 dependencies {
-    deobfProvided "mezz.jei:jei_1.12:4.7.5.86:api"
-    runtime "mezz.jei:jei_1.12:4.7.5.86"
+    deobfProvided "mezz.jei:jei_1.12.2:4.8.5.159:api"
+    runtime "mezz.jei:jei_1.12.2:4.8.5.159"
     shade 'org.squiddev:Cobalt:0.3.1'
 
     testCompile 'junit:junit:4.11'
diff --git a/src/main/java/dan200/computercraft/client/proxy/CCTurtleProxyClient.java b/src/main/java/dan200/computercraft/client/proxy/CCTurtleProxyClient.java
index 31b3b9385..236f59a81 100644
--- a/src/main/java/dan200/computercraft/client/proxy/CCTurtleProxyClient.java
+++ b/src/main/java/dan200/computercraft/client/proxy/CCTurtleProxyClient.java
@@ -210,7 +210,7 @@ public class CCTurtleProxyClient extends CCTurtleProxyCommon
     private static class TurtleItemColour implements IItemColor
     {
         @Override
-        public int getColorFromItemstack( @Nonnull ItemStack stack, int tintIndex )
+        public int colorMultiplier( @Nonnull ItemStack stack, int tintIndex )
         {
             if( tintIndex == 0 )
             {
diff --git a/src/main/java/dan200/computercraft/client/proxy/ComputerCraftProxyClient.java b/src/main/java/dan200/computercraft/client/proxy/ComputerCraftProxyClient.java
index e0cb37d83..39ba815b7 100644
--- a/src/main/java/dan200/computercraft/client/proxy/ComputerCraftProxyClient.java
+++ b/src/main/java/dan200/computercraft/client/proxy/ComputerCraftProxyClient.java
@@ -569,7 +569,7 @@ public class ComputerCraftProxyClient extends ComputerCraftProxyCommon
         }
 
         @Override
-        public int getColorFromItemstack( @Nonnull ItemStack stack, int layer )
+        public int colorMultiplier( @Nonnull ItemStack stack, int layer )
         {
             return layer == 0 ? 0xFFFFFF : disk.getColour( stack );
         }
diff --git a/src/main/java/dan200/computercraft/client/render/ModelTransformer.java b/src/main/java/dan200/computercraft/client/render/ModelTransformer.java
index 19653bfb2..16b4861dc 100644
--- a/src/main/java/dan200/computercraft/client/render/ModelTransformer.java
+++ b/src/main/java/dan200/computercraft/client/render/ModelTransformer.java
@@ -189,7 +189,7 @@ public final class ModelTransformer
         private BakedQuadBuilder( VertexFormat format )
         {
             this.format = format;
-            this.vertexData = new int[ format.getNextOffset() ];
+            this.vertexData = new int[ format.getSize() ];
         }
 
         @Nonnull
diff --git a/src/main/java/dan200/computercraft/shared/common/BlockGeneric.java b/src/main/java/dan200/computercraft/shared/common/BlockGeneric.java
index d870e2ca5..6308778a7 100644
--- a/src/main/java/dan200/computercraft/shared/common/BlockGeneric.java
+++ b/src/main/java/dan200/computercraft/shared/common/BlockGeneric.java
@@ -36,7 +36,7 @@ public abstract class BlockGeneric extends Block implements
     protected BlockGeneric( Material material )
     {
         super( material );
-        this.isBlockContainer = true;
+        this.hasTileEntity = true;
     }
 
     protected abstract IBlockState getDefaultBlockState( int damage, EnumFacing placedSide );
diff --git a/src/main/java/dan200/computercraft/shared/common/ColourableRecipe.java b/src/main/java/dan200/computercraft/shared/common/ColourableRecipe.java
index d86e1113c..99e7e02b4 100644
--- a/src/main/java/dan200/computercraft/shared/common/ColourableRecipe.java
+++ b/src/main/java/dan200/computercraft/shared/common/ColourableRecipe.java
@@ -86,7 +86,7 @@ public class ColourableRecipe extends IForgeRegistryEntry.Impl<IRecipe> implemen
     }
 
     @Override
-    public boolean isHidden()
+    public boolean isDynamic()
     {
         return true;
     }
diff --git a/src/main/java/dan200/computercraft/shared/media/recipes/DiskRecipe.java b/src/main/java/dan200/computercraft/shared/media/recipes/DiskRecipe.java
index e223db4ad..f11d8c4ff 100644
--- a/src/main/java/dan200/computercraft/shared/media/recipes/DiskRecipe.java
+++ b/src/main/java/dan200/computercraft/shared/media/recipes/DiskRecipe.java
@@ -91,7 +91,7 @@ public class DiskRecipe extends IForgeRegistryEntry.Impl<IRecipe> implements IRe
     }
 
     @Override
-    public boolean isHidden()
+    public boolean isDynamic()
     {
         return true;
     }
diff --git a/src/main/java/dan200/computercraft/shared/media/recipes/PrintoutRecipe.java b/src/main/java/dan200/computercraft/shared/media/recipes/PrintoutRecipe.java
index 0d9363cdc..fc629dcda 100644
--- a/src/main/java/dan200/computercraft/shared/media/recipes/PrintoutRecipe.java
+++ b/src/main/java/dan200/computercraft/shared/media/recipes/PrintoutRecipe.java
@@ -33,7 +33,7 @@ public class PrintoutRecipe extends IForgeRegistryEntry.Impl<IRecipe> implements
     }
 
     @Override
-    public boolean isHidden()
+    public boolean isDynamic()
     {
         return true;
     }
diff --git a/src/main/java/dan200/computercraft/shared/pocket/recipes/PocketComputerUpgradeRecipe.java b/src/main/java/dan200/computercraft/shared/pocket/recipes/PocketComputerUpgradeRecipe.java
index 4497f19db..5671dd159 100644
--- a/src/main/java/dan200/computercraft/shared/pocket/recipes/PocketComputerUpgradeRecipe.java
+++ b/src/main/java/dan200/computercraft/shared/pocket/recipes/PocketComputerUpgradeRecipe.java
@@ -34,7 +34,7 @@ public class PocketComputerUpgradeRecipe extends IForgeRegistryEntry.Impl<IRecip
     }
 
     @Override
-    public boolean isHidden()
+    public boolean isDynamic()
     {
         return true;
     }
diff --git a/src/main/java/dan200/computercraft/shared/turtle/recipes/TurtleUpgradeRecipe.java b/src/main/java/dan200/computercraft/shared/turtle/recipes/TurtleUpgradeRecipe.java
index 6cedad145..8f37742ee 100644
--- a/src/main/java/dan200/computercraft/shared/turtle/recipes/TurtleUpgradeRecipe.java
+++ b/src/main/java/dan200/computercraft/shared/turtle/recipes/TurtleUpgradeRecipe.java
@@ -37,7 +37,7 @@ public class TurtleUpgradeRecipe extends IForgeRegistryEntry.Impl<IRecipe> imple
     }
 
     @Override
-    public boolean isHidden()
+    public boolean isDynamic()
     {
         return true;
     }
diff --git a/src/main/java/dan200/computercraft/shared/util/WorldUtil.java b/src/main/java/dan200/computercraft/shared/util/WorldUtil.java
index 9daf082b3..5d00d954c 100644
--- a/src/main/java/dan200/computercraft/shared/util/WorldUtil.java
+++ b/src/main/java/dan200/computercraft/shared/util/WorldUtil.java
@@ -126,22 +126,8 @@ public class WorldUtil
     }
     
     public static Vec3d getRayEnd( EntityPlayer player) {
-        double reach = 4.5;
-        if( player instanceof EntityPlayerMP )
-        {
-            reach = ((EntityPlayerMP) player).interactionManager.getBlockReachDistance();
-        }
-        else if( player.getEntityWorld().isRemote )
-        {
-            reach = Minecraft.getMinecraft().playerController.getBlockReachDistance();
-        }
-        else if( player.capabilities.isCreativeMode )
-        {
-            reach = 5.0;
-        }
-        
+        double reach = player.getEntityAttribute(EntityPlayer.REACH_DISTANCE).getAttributeValue();
         Vec3d look = player.getLookVec();
-
         return getRayStart( player ).addVector( look.x * reach, look.y * reach, look.z * reach );
     }