diff --git a/gradle/runtime.libs.versions.toml b/gradle/runtime.libs.versions.toml
index 8befb1d7..d1e4b11c 100644
--- a/gradle/runtime.libs.versions.toml
+++ b/gradle/runtime.libs.versions.toml
@@ -16,8 +16,9 @@ javax-annotations = "3.0.2"
 forge-runtime = "2.0.9"
 access-transformers = "3.0.1"
 access-transformers-new = "8.0.5"
+access-transformers-neo = "10.0.2"
 unprotect = "1.2.0"
-asm = "9.3"
+asm = "9.7"
 union-relauncher = "1.0.0"
 access-transformers-log4j = "2.17.1"
 
@@ -41,6 +42,7 @@ naming-service = { module = "dev.architectury:architectury-naming-service", vers
 mcp-annotations = { module = "dev.architectury:mcp-annotations", version.ref = "forge-runtime" }
 access-transformers = { module = "net.minecraftforge:accesstransformers", version.ref = "access-transformers" }
 access-transformers-new = { module = "net.minecraftforge:accesstransformers", version.ref = "access-transformers-new" }
+access-transformers-neo = { module = "net.neoforged.accesstransformers:at-cli", version.ref = "access-transformers-neo" }
 unprotect = { module = "io.github.juuxel:unprotect", version.ref = "unprotect" }
 asm = { module = "org.ow2.asm:asm", version.ref = "asm" }
 union-relauncher = { module = "io.github.juuxel:union-relauncher", version.ref = "union-relauncher" }
diff --git a/src/main/java/net/fabricmc/loom/configuration/accesstransformer/AccessTransformerJarProcessor.java b/src/main/java/net/fabricmc/loom/configuration/accesstransformer/AccessTransformerJarProcessor.java
index f7bbcc59..1f8f9992 100644
--- a/src/main/java/net/fabricmc/loom/configuration/accesstransformer/AccessTransformerJarProcessor.java
+++ b/src/main/java/net/fabricmc/loom/configuration/accesstransformer/AccessTransformerJarProcessor.java
@@ -55,6 +55,7 @@ import net.fabricmc.loom.api.processor.MinecraftJarProcessor;
 import net.fabricmc.loom.api.processor.ProcessorContext;
 import net.fabricmc.loom.api.processor.SpecContext;
 import net.fabricmc.loom.build.IntermediaryNamespaces;
+import net.fabricmc.loom.configuration.providers.minecraft.MinecraftVersionMeta;
 import net.fabricmc.loom.util.Constants;
 import net.fabricmc.loom.util.DependencyDownloader;
 import net.fabricmc.loom.util.ExceptionUtil;
@@ -157,9 +158,11 @@ public class AccessTransformerJarProcessor implements MinecraftJarProcessor<Acce
 	}
 
 	public static void executeAt(Project project, Path input, Path output, AccessTransformerConfiguration configuration) throws IOException {
-		boolean serverBundleMetadataPresent = LoomGradleExtension.get(project).getMinecraftProvider().getServerBundleMetadata() != null;
+		LoomVersions accessTransformer = chooseAccessTransformer(project);
+		String mainClass = accessTransformer == LoomVersions.ACCESS_TRANSFORMERS_NEO ? "net.neoforged.accesstransformer.cli.TransformerProcessor"
+						: "net.minecraftforge.accesstransformer.TransformerProcessor";
 		FileCollection classpath = new DependencyDownloader(project)
-				.add((serverBundleMetadataPresent ? LoomVersions.ACCESS_TRANSFORMERS_NEW : LoomVersions.ACCESS_TRANSFORMERS).mavenNotation())
+				.add(accessTransformer.mavenNotation())
 				.add(LoomVersions.ASM.mavenNotation())
 				.platform(LoomVersions.ACCESS_TRANSFORMERS_LOG4J_BOM.mavenNotation())
 				.download();
@@ -172,12 +175,29 @@ public class AccessTransformerJarProcessor implements MinecraftJarProcessor<Acce
 		configuration.apply(args);
 
 		ForgeToolExecutor.exec(project, spec -> {
-			spec.getMainClass().set("net.minecraftforge.accesstransformer.TransformerProcessor");
+			spec.getMainClass().set(mainClass);
 			spec.setArgs(args);
 			spec.setClasspath(classpath);
 		}).rethrowFailure().assertNormalExitValue();
 	}
 
+	private static LoomVersions chooseAccessTransformer(Project project) {
+		LoomGradleExtension extension = LoomGradleExtension.get(project);
+		boolean serverBundleMetadataPresent = extension.getMinecraftProvider().getServerBundleMetadata() != null;
+
+		if (!serverBundleMetadataPresent) {
+			return LoomVersions.ACCESS_TRANSFORMERS;
+		} else if (extension.isNeoForge()) {
+			MinecraftVersionMeta.JavaVersion javaVersion = extension.getMinecraftProvider().getVersionInfo().javaVersion();
+
+			if (javaVersion != null && javaVersion.majorVersion() >= 21) {
+				return LoomVersions.ACCESS_TRANSFORMERS_NEO;
+			}
+		}
+
+		return LoomVersions.ACCESS_TRANSFORMERS_NEW;
+	}
+
 	@FunctionalInterface
 	public interface AccessTransformerConfiguration {
 		void apply(List<String> args) throws IOException;