diff -ru a/pyproject.toml b/pyproject.toml
--- a/pyproject.toml	2026-10-12 06:23:57.470696557 -0400
+++ b/pyproject.toml	2026-10-12 06:23:57.486503138 -0400
@@ -9,7 +9,7 @@
 
 [tool.poetry.dependencies]
 python = "^3.11"
-lief = "^0.15.1"
+lief = ">=0.16.0"
 miasm = "^0.1.5"
 
 
diff -ru a/themida_unmutate/rebuilding.py b/themida_unmutate/rebuilding.py
--- a/themida_unmutate/rebuilding.py	2026-10-12 06:23:57.470838856 -0400
+++ b/themida_unmutate/rebuilding.py	2026-10-12 06:23:57.486406813 -0400
@@ -49,10 +49,10 @@
         raise Exception(f"Failed to parse PE '{input_binary_path}'")
 
     # Create a new code section
-    unmut_section = lief.PE.Section([0] * NEW_SECTION_MAX_SIZE, NEW_SECTION_NAME,
-                                    lief.PE.Section.CHARACTERISTICS.CNT_CODE.value
-                                    | lief.PE.Section.CHARACTERISTICS.MEM_READ.value
-                                    | lief.PE.Section.CHARACTERISTICS.MEM_EXECUTE.value)
+    unmut_section = lief.PE.Section(NEW_SECTION_NAME, [0] * NEW_SECTION_MAX_SIZE)
+    unmut_section.characteristics = (lief.PE.Section.CHARACTERISTICS.CNT_CODE.value
+                                     | lief.PE.Section.CHARACTERISTICS.MEM_READ.value
+                                     | lief.PE.Section.CHARACTERISTICS.MEM_EXECUTE.value)
     pe_obj.add_section(unmut_section)
     unmut_section = pe_obj.get_section(NEW_SECTION_NAME)
     unmut_section_base = pe_obj.imagebase + unmut_section.virtual_address
@@ -119,12 +119,8 @@
         text_section_bytes[offset:offset + len(data)] = data
     text_section.content = memoryview(text_section_bytes)
 
-    # Invoke the builder
-    builder = lief.PE.Builder(pe_obj)
-    builder.build()
-
-    # Save the result
-    builder.write(output_binary_path)
+    # Build and save the result
+    pe_obj.write(output_binary_path)
 
 
 def __rebuild_simplified_binary_in_place(
@@ -196,12 +192,8 @@
         text_section_bytes[offset:offset + len(data)] = data
     text_section.content = memoryview(text_section_bytes)
 
-    # Invoke the builder
-    builder = lief.PE.Builder(pe_obj)
-    builder.build()
-
-    # Save the result
-    builder.write(output_binary_path)
+    # Build and save the result
+    pe_obj.write(output_binary_path)
 
 
 def __section_from_virtual_address(lief_bin: lief.Binary, virtual_addr: int) -> Optional[lief.Section]: