diff --git a/build.gradle b/build.gradle
index c827e4c..540541a 100644
--- a/build.gradle
+++ b/build.gradle
@@ -93,7 +93,7 @@ curseforge {
 		changelogType = "html"
 		changelog = file("changelog.txt")
 		releaseType = "release"
-		addGameVersion "1.20.2"
+		addGameVersion "1.20.4"
 		addGameVersion "Fabric"
 
 		mainArtifact(file("${project.buildDir}/libs/${archivesBaseName}-${version}.jar"))
diff --git a/changelog.txt b/changelog.txt
index 800ac82..b453ba8 100644
--- a/changelog.txt
+++ b/changelog.txt
@@ -1,2 +1,2 @@
-<p>A changelog can be found at:&nbsp;<a href="https://www.wimods.net/mo-glass/mo-glass-1-7/?mc=1.20.2&utm_source=CurseForge&utm_medium=Mo+Glass&utm_campaign=Changelog&utm_content=Mo+Glass+MC1.20.2">https://www.wimods.net/mo-glass/mo-glass-1-7/</a></p>
-<p><strong>Note:</strong> This mod requires <a href="https://www.curseforge.com/minecraft/mc-mods/fabric-api/files/4940225" target="_blank" rel="noopener noreferrer">Fabric API for Minecraft 1.20.2</a>.</p>
+<p>A changelog can be found at:&nbsp;<a href="https://www.wimods.net/mo-glass/mo-glass-1-7/?mc=1.20.4&utm_source=CurseForge&utm_medium=Mo+Glass&utm_campaign=Changelog&utm_content=Mo+Glass+MC1.20.4">https://www.wimods.net/mo-glass/mo-glass-1-7/</a></p>
+<p><strong>Note:</strong> This mod requires <a href="https://www.curseforge.com/minecraft/mc-mods/fabric-api/files/4940245" target="_blank" rel="noopener noreferrer">Fabric API for Minecraft 1.20.4</a>.</p>
diff --git a/gradle.properties b/gradle.properties
index 593a1ce..174dff6 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -5,15 +5,15 @@ org.gradle.parallel=true
 # Fabric Properties
 # check these at https://fabricmc.net/develop/ and
 # https://www.curseforge.com/minecraft/mc-mods/fabric-api
-minecraft_version=1.20.2
-yarn_mappings=1.20.2+build.4
+minecraft_version=1.20.4
+yarn_mappings=1.20.4+build.2
 loader_version=0.15.1
 
 #Fabric api
-fabric_version=0.91.2+1.20.2
+fabric_version=0.91.2+1.20.4
 
 # Mod Properties
-mod_version = 1.7-MC1.20.2
+mod_version = 1.7-MC1.20.4
 maven_group = net.wurstclient.glass
 archives_base_name = Mo-Glass
 
diff --git a/src/main/java/net/wurstclient/glass/mixin/GlassBlockMixin.java b/src/main/java/net/wurstclient/glass/mixin/GlassBlockMixin.java
index 2b4f88a..99b28c3 100644
--- a/src/main/java/net/wurstclient/glass/mixin/GlassBlockMixin.java
+++ b/src/main/java/net/wurstclient/glass/mixin/GlassBlockMixin.java
@@ -9,11 +9,12 @@
 
 import org.spongepowered.asm.mixin.Mixin;
 
-import net.minecraft.block.AbstractGlassBlock;
 import net.minecraft.block.BlockState;
-import net.minecraft.block.GlassBlock;
+import net.minecraft.block.Blocks;
 import net.minecraft.block.SlabBlock;
 import net.minecraft.block.StairsBlock;
+import net.minecraft.block.TranslucentBlock;
+import net.minecraft.block.TransparentBlock;
 import net.minecraft.block.enums.BlockHalf;
 import net.minecraft.block.enums.SlabType;
 import net.minecraft.block.enums.StairShape;
@@ -21,8 +22,8 @@
 import net.wurstclient.glass.MoGlass;
 import net.wurstclient.glass.MoGlassBlocks;
 
-@Mixin(GlassBlock.class)
-public class GlassBlockMixin extends AbstractGlassBlock
+@Mixin(TransparentBlock.class)
+public abstract class GlassBlockMixin extends TranslucentBlock
 {
 	private GlassBlockMixin(MoGlass moGlass, Settings settings)
 	{
@@ -33,14 +34,17 @@ private GlassBlockMixin(MoGlass moGlass, Settings settings)
 	public boolean isSideInvisible(BlockState state, BlockState stateFrom,
 		Direction direction)
 	{
-		if(stateFrom.getBlock() == MoGlassBlocks.GLASS_SLAB)
-			if(isInvisibleToGlassSlab(state, stateFrom, direction))
-				return true;
-			
-		if(stateFrom.getBlock() == MoGlassBlocks.GLASS_STAIRS)
-			if(isInvisibleToGlassStairs(state, stateFrom, direction))
-				return true;
-			
+		if(state.getBlock() == Blocks.GLASS)
+		{
+			if(stateFrom.getBlock() == MoGlassBlocks.GLASS_SLAB)
+				if(isInvisibleToGlassSlab(state, stateFrom, direction))
+					return true;
+				
+			if(stateFrom.getBlock() == MoGlassBlocks.GLASS_STAIRS)
+				if(isInvisibleToGlassStairs(state, stateFrom, direction))
+					return true;
+		}
+		
 		return super.isSideInvisible(state, stateFrom, direction);
 	}
 	
diff --git a/src/main/java/net/wurstclient/glass/mixin/StainedGlassBlockMixin.java b/src/main/java/net/wurstclient/glass/mixin/StainedGlassBlockMixin.java
index 540eceb..2eced15 100644
--- a/src/main/java/net/wurstclient/glass/mixin/StainedGlassBlockMixin.java
+++ b/src/main/java/net/wurstclient/glass/mixin/StainedGlassBlockMixin.java
@@ -11,13 +11,12 @@
 import org.spongepowered.asm.mixin.Mixin;
 import org.spongepowered.asm.mixin.Shadow;
 
-import net.minecraft.block.AbstractGlassBlock;
 import net.minecraft.block.Block;
 import net.minecraft.block.BlockState;
 import net.minecraft.block.SlabBlock;
-import net.minecraft.block.Stainable;
 import net.minecraft.block.StainedGlassBlock;
 import net.minecraft.block.StairsBlock;
+import net.minecraft.block.TransparentBlock;
 import net.minecraft.block.enums.BlockHalf;
 import net.minecraft.block.enums.SlabType;
 import net.minecraft.block.enums.StairShape;
@@ -28,8 +27,7 @@
 import net.wurstclient.glass.StainedGlassStairsBlock;
 
 @Mixin(StainedGlassBlock.class)
-public abstract class StainedGlassBlockMixin extends AbstractGlassBlock
-	implements Stainable
+public abstract class StainedGlassBlockMixin extends TransparentBlock
 {
 	@Shadow
 	@Final
diff --git a/src/main/java/net/wurstclient/glass/mixin/TintedGlassBlockMixin.java b/src/main/java/net/wurstclient/glass/mixin/TintedGlassBlockMixin.java
index 7fd4ab3..624d01d 100644
--- a/src/main/java/net/wurstclient/glass/mixin/TintedGlassBlockMixin.java
+++ b/src/main/java/net/wurstclient/glass/mixin/TintedGlassBlockMixin.java
@@ -9,11 +9,11 @@
 
 import org.spongepowered.asm.mixin.Mixin;
 
-import net.minecraft.block.AbstractGlassBlock;
 import net.minecraft.block.BlockState;
 import net.minecraft.block.SlabBlock;
 import net.minecraft.block.StairsBlock;
 import net.minecraft.block.TintedGlassBlock;
+import net.minecraft.block.TransparentBlock;
 import net.minecraft.block.enums.BlockHalf;
 import net.minecraft.block.enums.SlabType;
 import net.minecraft.block.enums.StairShape;
@@ -22,7 +22,7 @@
 import net.wurstclient.glass.MoGlassBlocks;
 
 @Mixin(TintedGlassBlock.class)
-public class TintedGlassBlockMixin extends AbstractGlassBlock
+public abstract class TintedGlassBlockMixin extends TransparentBlock
 {
 	private TintedGlassBlockMixin(MoGlass moGlass, Settings settings)
 	{
diff --git a/src/main/resources/fabric.mod.json b/src/main/resources/fabric.mod.json
index 39eeaac..8ad5afa 100644
--- a/src/main/resources/fabric.mod.json
+++ b/src/main/resources/fabric.mod.json
@@ -34,8 +34,8 @@
 
   "depends": {
     "fabricloader": ">=0.15.0",
-    "fabric-api": ">=0.79.1",
-    "minecraft": "~1.20-alpha.23.17.a",
+    "fabric-api": ">=0.90.5",
+    "minecraft": "~1.20.3-alpha.23.43.a",
     "java": ">=17"
   },
   "suggests": {