diff --git a/src/main/java/run/slicer/vf/impl/ClassSource.java b/src/main/java/run/slicer/vf/impl/ClassSource.java
index 44ea2e3..5b32f07 100644
--- a/src/main/java/run/slicer/vf/impl/ClassSource.java
+++ b/src/main/java/run/slicer/vf/impl/ClassSource.java
@@ -93,7 +93,16 @@ private static Map<String, ResourceData> resources(String[] names, String[] reso
         return res;
     }
 
-    private record DependencyAnalyzer(Map<String, ResourceData> data, Function<String, byte[]> source) {
+    private static final class DependencyAnalyzer {
+        private final Map<String, ResourceData> data;
+        private final Function<String, byte[]> source;
+        private final Set<String> checkedSuper = new HashSet<>();
+
+        DependencyAnalyzer(Map<String, ResourceData> data, Function<String, byte[]> source) {
+            this.data = data;
+            this.source = source;
+        }
+
         void analyze() {
             for (final ResourceData resource : new ArrayList<>(data.values())) {
                 if (resource == null) {
@@ -117,7 +126,7 @@ void analyze() {
                                 if (name.charAt(0) == '[') {
                                     addType(name);
                                 } else {
-                                    addName(name);
+                                    addSuperTypes(name);
                                 }
                             }
                             case PooledConstant.CONSTANT_NameAndType -> {
@@ -138,6 +147,40 @@ void analyze() {
             }
         }
 
+        private void addSuperTypes(String className) {
+            if (!checkedSuper.add(className)) {
+                return; // already visited
+            }
+
+            addName(className);
+            ResourceData resource = data.get(className);
+            if (resource == null) {
+                return;
+            }
+            final var is = new DataInputFullStream(resource.data());
+            try {
+                is.discard(8); // skip magic and version
+                final var cp = new ConstantPool(is);
+                is.discard(4); //skip access flags and this class
+                int superclassIndex = is.readUnsignedShort();
+                if (superclassIndex == 0) {
+                    return;
+                }
+                PooledConstant superclass = cp.getConstant(superclassIndex);
+                String superclassName = ((PrimitiveConstant) superclass).getString();
+                addSuperTypes(superclassName);
+                int interfacesCount = is.readUnsignedShort();
+                for (int i = 0; i < interfacesCount; i++) {
+                    int interfaceIndex = is.readUnsignedShort();
+                    PooledConstant interfaceConstant = cp.getConstant(interfaceIndex);
+                    String str = ((PrimitiveConstant) interfaceConstant).getString();
+                    addSuperTypes(str);
+                }
+            } catch (IOException e) {
+                throw new UncheckedIOException(e);
+            }
+        }
+
         private void addMethodType(String descriptor) {
             if (descriptor == null || descriptor.isEmpty()) {
                 return;