diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 80f26719..e2522898 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -5,7 +5,7 @@ on:
   pull_request:
   push:
     branches:
-      - "1.21.2"
+      - "1.21.3"
 
 jobs:
   build:
diff --git a/.github/workflows/prerelease.yml b/.github/workflows/prerelease.yml
index b6a90f30..57e96793 100644
--- a/.github/workflows/prerelease.yml
+++ b/.github/workflows/prerelease.yml
@@ -1,9 +1,9 @@
-name: 1.21.2 PreRelease Build and Release
+name: 1.21.3 PreRelease Build and Release
 
 on:
   push:
     tags:
-      - '[0-9]+.[0-9]+.[0-9]+\+1.21.2.pre'
+      - '[0-9]+.[0-9]+.[0-9]+\+1.21.3.pre'
 
 jobs:
   build-java-and-linux-amd64:
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 7158afe9..ae90297c 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -1,9 +1,9 @@
-name: 1.21.2 Build and Release
+name: 1.21.3 Build and Release
 
 on:
   push:
     tags:
-      - '[0-9]+.[0-9]+.[0-9]+\+1.21.2'
+      - '[0-9]+.[0-9]+.[0-9]+\+1.21.3'
 
 jobs:
   build-java-and-linux-amd64:
diff --git a/build.gradle.kts b/build.gradle.kts
index 9ace6d00..5d65c1cf 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -10,7 +10,7 @@ plugins {
 }
 
 group = "com.zenith"
-version = "1.21.2"
+version = "1.21.3"
 
 val javaVersion23 = JavaLanguageVersion.of(23)
 val javaVersion21 = JavaLanguageVersion.of(21)
@@ -57,7 +57,7 @@ dependencies {
     implementation("com.github.rfresh2.discord4j:discord4j-core:3.4.3.9") {
         exclude(group = "io.netty")
     }
-    implementation("com.github.rfresh2:MCProtocolLib:1.21.2.7") {
+    implementation("com.github.rfresh2:MCProtocolLib:1.21.3.1") {
         exclude(group = "io.netty.incubator")
         exclude(group = "io.netty")
     }
diff --git a/src/launcher/launch_config.py b/src/launcher/launch_config.py
index a15c780e..1a6bb64d 100644
--- a/src/launcher/launch_config.py
+++ b/src/launcher/launch_config.py
@@ -29,7 +29,7 @@ def read_launch_config_file():
 class LaunchConfig:
     auto_update = True
     auto_update_launcher = True
-    release_channel = "java.1.21.2"
+    release_channel = "java.1.21.3"
     version = "0.0.0"
     local_version = "0.0.0"
     repo_owner = "rfresh2"
diff --git a/src/launcher/setup.py b/src/launcher/setup.py
index 91fb64a2..dce6bd69 100644
--- a/src/launcher/setup.py
+++ b/src/launcher/setup.py
@@ -42,7 +42,7 @@ def setup_execute(config):
     #         print("Invalid input. Enter 1 or 2")
     # print("")
 
-    minecraft_version = "1.21.2"
+    minecraft_version = "1.21.3"
 
     config.auto_update = True
     config.auto_update_launcher = True
diff --git a/src/main/java/com/zenith/module/impl/PlayerSimulation.java b/src/main/java/com/zenith/module/impl/PlayerSimulation.java
index cc16caf1..6df8915d 100644
--- a/src/main/java/com/zenith/module/impl/PlayerSimulation.java
+++ b/src/main/java/com/zenith/module/impl/PlayerSimulation.java
@@ -492,7 +492,7 @@ private void tryCheckInsideBlocks() {
                 fallDistance = 0.0;
                 stuckSpeedMultiplier.set(0.25, 0.05, 0.25);
             } else if (localState.block() == BlockRegistry.HONEY_BLOCK) {
-                // todo: changes in 1.21.2
+                // todo: changes in 1.21.3
                 if (isSlidingDownHoneyBlock(localState.x(), localState.y(), localState.z())) {
                     if (velocity.getY() < -0.13) {
                         double d = -0.05 / velocity.getY();
diff --git a/src/main/java/com/zenith/util/LaunchConfig.java b/src/main/java/com/zenith/util/LaunchConfig.java
index 7fd50646..d4316f1c 100644
--- a/src/main/java/com/zenith/util/LaunchConfig.java
+++ b/src/main/java/com/zenith/util/LaunchConfig.java
@@ -5,7 +5,7 @@
 public class LaunchConfig {
     public boolean auto_update = true;
     public boolean auto_update_launcher = true;
-    public String release_channel = "java.1.21.2";
+    public String release_channel = "java.1.21.3";
     public @Nullable String getMcVersion() {
         try {
             return release_channel.substring(release_channel.indexOf('.') + 1);
diff --git a/src/main/java/com/zenith/via/ZenithViaInitializer.java b/src/main/java/com/zenith/via/ZenithViaInitializer.java
index d8948c5e..e7fd9488 100644
--- a/src/main/java/com/zenith/via/ZenithViaInitializer.java
+++ b/src/main/java/com/zenith/via/ZenithViaInitializer.java
@@ -53,7 +53,7 @@ public void init() {
     // pipeline order after readTimeout -> encryption -> sizer -> compression -> via-codec -> codec -> manager
 
     public void clientViaChannelInitializer(Channel channel, Session client) {
-        // todo: remove when via supports 1.21.2
+        // todo: remove when via supports 1.21.3
         if (true) return;
 
         if (!CONFIG.client.viaversion.enabled) return;
@@ -71,7 +71,7 @@ public void clientViaChannelInitializer(Channel channel, Session client) {
     }
 
     public void serverViaChannelInitializer(final Channel channel) {
-        // todo: remove when via supports 1.21.2
+        // todo: remove when via supports 1.21.3
         if (true) return;
 
         if (!CONFIG.server.viaversion.enabled) return;