diff --git a/build.gradle.kts b/build.gradle.kts
index 17c4642..f4a3707 100644
--- a/build.gradle.kts
+++ b/build.gradle.kts
@@ -10,7 +10,7 @@ repositories {
 
 dependencies {
     api("com.google.code.gson:gson:2.10.1")
-    api("com.viaversion:opennbt:2.1.2")
+    api("com.viaversion:nbt:3.0.0")
     api("it.unimi.dsi:fastutil:8.5.12")
     api("ch.qos.logback:logback-classic:1.4.6")
     compileOnly("org.jetbrains:annotations:24.0.1")
@@ -19,7 +19,7 @@ dependencies {
 }
 
 group = "com.viaversion"
-version = "3.3.0"
+version = "3.3.1"
 description = "MappingsGenerator"
 java.sourceCompatibility = JavaVersion.VERSION_17
 
diff --git a/src/main/java/com/viaversion/mappingsgenerator/ManualRunner.java b/src/main/java/com/viaversion/mappingsgenerator/ManualRunner.java
index 41dab25..6dbc31b 100644
--- a/src/main/java/com/viaversion/mappingsgenerator/ManualRunner.java
+++ b/src/main/java/com/viaversion/mappingsgenerator/ManualRunner.java
@@ -40,8 +40,8 @@ public final class ManualRunner {
             return;
         }
 
-        final String from = "1.19.4";
-        final String to = "1.20";
+        final String from = "1.20.2";
+        final String to = "1.20.3";
         MappingsOptimizer mappingsOptimizer = new MappingsOptimizer(from, to);
         mappingsOptimizer.writeDiffStubs();
         mappingsOptimizer.optimizeAndWrite();