diff --git a/common/src/main/java/com/seibel/distanthorizons/common/wrappers/modAccessor/ImmersivePortalsAccessorCommon.java b/common/src/main/java/com/seibel/distanthorizons/common/wrappers/modAccessor/ImmersivePortalsAccessorCommon.java
index 28a0cc67e..adb8cbcf0 100644
--- a/common/src/main/java/com/seibel/distanthorizons/common/wrappers/modAccessor/ImmersivePortalsAccessorCommon.java
+++ b/common/src/main/java/com/seibel/distanthorizons/common/wrappers/modAccessor/ImmersivePortalsAccessorCommon.java
@@ -40,6 +40,7 @@ public abstract class ImmersivePortalsAccessorCommon extends ImmersivePortalsAbs
 		return Minecraft.getInstance().level.entitiesForRendering();
 	}
 	
+	#if MC_VER < MC_1_21_6
 	private static Matrix4f getProjectionMatrix() {
 		#if MC_VER > MC_1_16_5
 		return RenderSystem.getProjectionMatrix();
@@ -53,6 +54,7 @@ public abstract class ImmersivePortalsAccessorCommon extends ImmersivePortalsAbs
 		}
 		#endif
 	}
+	#endif
 	
 	#if MC_VER <= MC_1_19_2
 	protected abstract Matrix4f convert(Mat4f matrix);
@@ -61,6 +63,7 @@ public abstract class ImmersivePortalsAccessorCommon extends ImmersivePortalsAbs
 	@Override
 	protected Supplier<?> getFrustumSupplier()
 	{
+		#if MC_VER < MC_1_21_6 // TODO Fix this for 1.21.6+ when a more modern version of Immersive Portals is available.
 		return Suppliers.memoize(() -> {
 			Frustum frustum = new Frustum(
 				#if MC_VER > MC_1_19_2
@@ -76,6 +79,9 @@ public abstract class ImmersivePortalsAccessorCommon extends ImmersivePortalsAbs
 			
 			return frustum;
 		});
+		#else
+		return null;
+		#endif
 	}
 	
 }
diff --git a/coreSubProjects b/coreSubProjects
index ea51b9135..dcb049d4c 160000
--- a/coreSubProjects
+++ b/coreSubProjects
@@ -1 +1 @@
-Subproject commit ea51b9135d6b1d559398f961b24e662fde190451
+Subproject commit dcb049d4c2cf0e46b1949982f3404b489b95f171
diff --git a/gradle.properties b/gradle.properties
index 98cafaa56..e640f3d00 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -47,7 +47,7 @@ versionStr=
 
 # This defines what MC version Intellij will use for the preprocessor
 # and what version is used automatically by build and run commands
-mcVer=1.21.1
+mcVer=1.21.6
 
 # Defines the maximum amount of memory Minecraft is allowed when run in a development environment
 minecraftMemoryJavaArg=-Xmx6G