diff --git a/gradle.properties b/gradle.properties
index e02c57e..ecf46d7 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -3,8 +3,8 @@ org.gradle.jvmargs=-Xmx1G
 
 # minecraft, mappings and loader dependencies
 # check these on https://modmuss50.me/fabric.html
-minecraft_version=1.21-pre2
-quilt_mappings=3
+minecraft_version=1.21-pre4
+quilt_mappings=1
 loader_version=0.15.11
 
 # mod properties
@@ -15,4 +15,4 @@ archives_base_name=rainglow
 # other dependencies
 java_version=21
 mod_menu_version=11.0.0-beta.1
-fabric_api_version=0.99.4+1.21
+fabric_api_version=0.100.0+1.21
diff --git a/src/main/java/io/ix0rai/rainglow/Rainglow.java b/src/main/java/io/ix0rai/rainglow/Rainglow.java
index ea0985c..d8474fa 100644
--- a/src/main/java/io/ix0rai/rainglow/Rainglow.java
+++ b/src/main/java/io/ix0rai/rainglow/Rainglow.java
@@ -54,7 +54,7 @@ public void onInitialize() {
     }
 
     public static Identifier id(String id) {
-        return Identifier.method_60655(MOD_ID, id);
+        return Identifier.of(MOD_ID, id);
     }
 
     public static String generateRandomColourId(World world, RandomGenerator random) {
diff --git a/src/main/java/io/ix0rai/rainglow/config/CustomModeScreen.java b/src/main/java/io/ix0rai/rainglow/config/CustomModeScreen.java
index 0493e58..1e56d4a 100644
--- a/src/main/java/io/ix0rai/rainglow/config/CustomModeScreen.java
+++ b/src/main/java/io/ix0rai/rainglow/config/CustomModeScreen.java
@@ -30,22 +30,22 @@ public CustomModeScreen(Screen parent) {
 		super(parent, MinecraftClient.getInstance().options, TITLE);
 
 		this.saveButton = ButtonWidget.builder(
-			Rainglow.translatableText("config.save"),
-			button -> {
-				boolean hasColourSelected = false;
-				for (DeferredSaveOption<Boolean> option : this.options) {
-					if (option.deferredValue) {
-						hasColourSelected = true;
-						break;
+				Rainglow.translatableText("config.save"),
+				button -> {
+					boolean hasColourSelected = false;
+					for (DeferredSaveOption<Boolean> option : this.options) {
+						if (option.deferredValue) {
+							hasColourSelected = true;
+							break;
+						}
 					}
-				}
-
-				if (!hasColourSelected) {
-					sendNoColoursToast();
-				} else {
-					this.save();
-				}
-			}).build();
+
+					if (!hasColourSelected) {
+						sendNoColoursToast();
+					} else {
+						this.save();
+					}
+				}).build();
 		this.saveButton.active = false;
 	}
 
@@ -54,15 +54,15 @@ private void createColourToggles() {
 
 		for (RainglowColour colour : RainglowColour.values()) {
 			this.options.add(DeferredSaveOption.createDeferredBoolean(
-				"colour." + colour.getId(),
-				null,
-				Rainglow.CONFIG.customColours.getRealValue().contains(colour.getId()),
-				enabled -> {
-					if (enabled) {
-						Rainglow.CONFIG.customColours.getRealValue().add(colour.getId());
-					}
-				},
-				enabled -> this.saveButton.active = true
+					"colour." + colour.getId(),
+					null,
+					Rainglow.CONFIG.customColours.getRealValue().contains(colour.getId()),
+					enabled -> {
+						if (enabled) {
+							Rainglow.CONFIG.customColours.getRealValue().add(colour.getId());
+						}
+					},
+					enabled -> this.saveButton.active = true
 			));
 		}
 	}
diff --git a/src/main/java/io/ix0rai/rainglow/config/RainglowConfigScreen.java b/src/main/java/io/ix0rai/rainglow/config/RainglowConfigScreen.java
index 819f40d..ca600bf 100644
--- a/src/main/java/io/ix0rai/rainglow/config/RainglowConfigScreen.java
+++ b/src/main/java/io/ix0rai/rainglow/config/RainglowConfigScreen.java
@@ -101,10 +101,10 @@ public void init() {
 
             contentLayout.add(gridWidget);
             contentLayout.add(ButtonWidget.builder(
-                    Rainglow.translatableText("config.custom"),
-                    button -> MinecraftClient.getInstance().setScreen(new CustomModeScreen(this))
-                ).width(308).position(4, 0).build(),
-                LayoutSettings.create().setPadding(4, 0));
+                            Rainglow.translatableText("config.custom"),
+                            button -> MinecraftClient.getInstance().setScreen(new CustomModeScreen(this))
+                    ).width(308).position(4, 0).build(),
+                    LayoutSettings.create().setPadding(4, 0));
 
             headerFooterWidget.addToContents(contentLayout);
 
@@ -132,14 +132,14 @@ private DeferredSaveOption<Boolean> createEntityToggle(RainglowEntity entity) {
 
     private DeferredSaveOption<Integer> createColourRaritySlider(RainglowEntity entity) {
         return sliders.computeIfAbsent(entity, e -> DeferredSaveOption.createDeferredRangedInt(
-				"config." + e.getId() + "_rarity",
-				"tooltip.rarity",
-				Rainglow.CONFIG.rarities.getRealValue().get(e.getId()),
-				0,
-				100,
-				rarity -> Rainglow.CONFIG.rarities.getRealValue().put(e.getId(), rarity),
+                "config." + e.getId() + "_rarity",
+                "tooltip.rarity",
+                Rainglow.CONFIG.rarities.getRealValue().get(e.getId()),
+                0,
+                100,
+                rarity -> Rainglow.CONFIG.rarities.getRealValue().put(e.getId(), rarity),
                 rarity -> this.saveButton.active = true
-		));
+        ));
     }
 
     public CyclingButtonWidget<RainglowMode> createModeButton() {
diff --git a/src/main/java/io/ix0rai/rainglow/data/RainglowColour.java b/src/main/java/io/ix0rai/rainglow/data/RainglowColour.java
index 20f057a..0b29c6b 100644
--- a/src/main/java/io/ix0rai/rainglow/data/RainglowColour.java
+++ b/src/main/java/io/ix0rai/rainglow/data/RainglowColour.java
@@ -58,15 +58,15 @@ public Identifier getTexture(RainglowEntity entityType) {
                 switch (entity) {
                     case GLOW_SQUID -> {
                         String textureName = RainglowEntity.GLOW_SQUID.getDefaultColour() == this ? "glow_squid" : this.getId();
-                        this.textures.put(entity, Identifier.method_60656("textures/entity/squid/" + textureName + ".png"));
+                        this.textures.put(entity, Identifier.ofDefault("textures/entity/squid/" + textureName + ".png"));
                     }
                     case ALLAY -> {
                         String textureName = RainglowEntity.ALLAY.getDefaultColour() == this ? "allay" : this.getId();
-                        this.textures.put(entity, Identifier.method_60656("textures/entity/allay/" + textureName + ".png"));
+                        this.textures.put(entity, Identifier.ofDefault("textures/entity/allay/" + textureName + ".png"));
                     }
                     case SLIME -> {
                         String textureName = RainglowEntity.SLIME.getDefaultColour() == this ? "slime" : this.getId();
-                        this.textures.put(entity, Identifier.method_60656("textures/entity/slime/" + textureName + ".png"));
+                        this.textures.put(entity, Identifier.ofDefault("textures/entity/slime/" + textureName + ".png"));
                     }
                 }
             }