diff --git a/build.gradle b/build.gradle
index e14466377..6b8f09d3b 100644
--- a/build.gradle
+++ b/build.gradle
@@ -174,7 +174,7 @@ configurations {
 }
 
 dependencies {
-    deobfCompile "mezz.jei:jei_1.8.9:${config.jei.version}"
+    deobfCompile "mezz.jei:jei_1.8.8:${config.jei.version}"
     deobfCompile "li.cil.tis3d:TIS-3D:${config.tis3d.version}"
 /*
     provided "codechicken:CodeChickenCore:${config.minecraft.version}-${config.ccc.version}:dev"
@@ -275,7 +275,7 @@ minecraft {
 
     // snapshot_YYYYMMDD   snapshot are built nightly.
     // stable_#            stables are built at the discretion of the MCP team.
-    mappings = "stable_20"
+    mappings = "snapshot_20151219"
 
     replace "@VERSION@", project.simpleVersion
 }
diff --git a/build.properties b/build.properties
index 27adf3979..2ac793e2d 100644
--- a/build.properties
+++ b/build.properties
@@ -1,5 +1,5 @@
-minecraft.version=1.8.9
-forge.version=11.15.0.1684
+minecraft.version=1.8.8
+forge.version=11.15.0.1653-1.8.8
 
 oc.version=1.5.21
 oc.subversion=dev
@@ -28,7 +28,7 @@ gc.version=3.0.7
 gt.version=5.04.06
 ic2.version=2.2.654-experimental
 igwmod.version=1.1.3-18
-jei.version=2.13.2.54
+jei.version=2.12.0.51
 mekanism.build=5
 mekanism.version=7.1.2
 mfr.cf=2229/626
@@ -42,7 +42,7 @@ rc.cf=2219/321
 rc.version=1.7.10-9.4.0.0
 redlogic.version=59.0.3
 rotc.version=V5c
-tis3d.version=MC1.8.9-0.8.0.2
+tis3d.version=MC1.8.8-0.7.1.70
 tmech.version=75.0afb56c
 re.version=3.0.0.342
 waila.version=1.6.0_B1_1.8.1
diff --git a/src/main/scala/li/cil/oc/common/launch/TransformerLoader.scala b/src/main/scala/li/cil/oc/common/launch/TransformerLoader.scala
index e6e6e41dc..1267e3704 100644
--- a/src/main/scala/li/cil/oc/common/launch/TransformerLoader.scala
+++ b/src/main/scala/li/cil/oc/common/launch/TransformerLoader.scala
@@ -8,7 +8,7 @@ import net.minecraftforge.fml.relauncher.IFMLLoadingPlugin.MCVersion
 import net.minecraftforge.fml.relauncher.IFMLLoadingPlugin.TransformerExclusions
 
 @TransformerExclusions(Array("li.cil.oc.common.asm"))
-@MCVersion("1.8.9")
+@MCVersion("1.8.8")
 class TransformerLoader extends IFMLLoadingPlugin {
   val instance = this