diff --git a/gradle.properties b/gradle.properties
index c3de48b8..584eab34 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -8,11 +8,11 @@ yarn_mappings=1.20.6+build.1
 loader_version=0.15.10
 
 #Fabric api
-fabric_version=0.97.6+1.20.6
+fabric_version=0.100.0+1.20.6
 
 maven_group = eu.pb4
 
-mod_version = 0.8.2
+mod_version = 0.8.3
 
 minecraft_version_supported = ">=1.20.5-"
 
diff --git a/polymer-core/src/main/java/eu/pb4/polymer/core/api/item/PolymerItemUtils.java b/polymer-core/src/main/java/eu/pb4/polymer/core/api/item/PolymerItemUtils.java
index 3f887353..71957865 100644
--- a/polymer-core/src/main/java/eu/pb4/polymer/core/api/item/PolymerItemUtils.java
+++ b/polymer-core/src/main/java/eu/pb4/polymer/core/api/item/PolymerItemUtils.java
@@ -552,7 +552,7 @@ public static void markAsPolymer(DataComponentType<?>... types) {
     }
 
     public static boolean isPolymerComponent(DataComponentType<?> type) {
-        return UNSYNCED_COMPONENTS.add(type);
+        return UNSYNCED_COMPONENTS.contains(type);
     }
 
     public static ItemStack getClientItemStack(ItemStack stack, ServerPlayerEntity player) {
diff --git a/polymer-core/src/main/java/eu/pb4/polymer/core/impl/client/InternalClientRegistry.java b/polymer-core/src/main/java/eu/pb4/polymer/core/impl/client/InternalClientRegistry.java
index 70b29158..79ec07c6 100644
--- a/polymer-core/src/main/java/eu/pb4/polymer/core/impl/client/InternalClientRegistry.java
+++ b/polymer-core/src/main/java/eu/pb4/polymer/core/impl/client/InternalClientRegistry.java
@@ -388,7 +388,13 @@ private static void setItemGroupPage(ItemGroup group, int page) {
         ((ClientItemGroupExtension) group).polymerCore$setPage(page);
         if (CompatStatus.FABRIC_ITEM_GROUP) {
             try {
-                ((net.fabricmc.fabric.impl.itemgroup.FabricItemGroup) group).setPage(page);
+                try {
+                    ((net.fabricmc.fabric.impl.itemgroup.FabricItemGroupImpl) group).fabric_setPage(page);
+                } catch (Throwable e) {
+                    var method = group.getClass().getMethod("setPage", int.class);
+                    method.invoke(group, page);
+                }
+
             } catch (Throwable e) {
                 PolymerImpl.LOGGER.warn("Couldn't set page of ItemGroup (FABRIC)", e);
             }