diff --git a/compatibility_matrices/bump.py b/compatibility_matrices/bump.py
index 5cad1e5..a5a453b 100755
--- a/compatibility_matrices/bump.py
+++ b/compatibility_matrices/bump.py
@@ -16,8 +16,6 @@
 #
 """
 Creates the next compatibility matrix.
-
-Requires libvintf Level.h to be updated before executing this script.
 """
 
 import argparse
@@ -44,41 +42,28 @@
         self.top = pathlib.Path(os.environ["ANDROID_BUILD_TOP"])
         self.interfaces_dir = self.top / "hardware/interfaces"
 
-        self.current_level = cmdline_args.current
+        self.current_level = cmdline_args.current_level
+        self.current_letter = cmdline_args.current_letter
         self.current_module_name = f"framework_compatibility_matrix.{self.current_level}.xml"
         self.current_xml = self.interfaces_dir / f"compatibility_matrices/compatibility_matrix.{self.current_level}.xml"
         self.device_module_name = "framework_compatibility_matrix.device.xml"
 
-        self.next_level = cmdline_args.next
+        self.next_level = cmdline_args.next_level
+        self.next_letter = cmdline_args.next_letter
         self.next_module_name = f"framework_compatibility_matrix.{self.next_level}.xml"
         self.next_xml = self.interfaces_dir / f"compatibility_matrices/compatibility_matrix.{self.next_level}.xml"
 
-        self.level_to_letter = self.get_level_to_letter_mapping()
-        print("Found level mapping in libvintf Level.h:", self.level_to_letter)
-
     def run(self):
         self.bump_kernel_configs()
         self.copy_matrix()
         self.edit_android_bp()
         self.edit_android_mk()
 
-    def get_level_to_letter_mapping(self):
-        levels_file = self.top / "system/libvintf/include/vintf/Level.h"
-        with open(levels_file) as f:
-            lines = f.readlines()
-            pairs = [
-                line.split("=", maxsplit=2) for line in lines if "=" in line
-            ]
-            return {
-                level.strip().removesuffix(","): letter.strip()
-                for letter, level in pairs
-            }
-
     def bump_kernel_configs(self):
         check_call([
             self.top / "kernel/configs/tools/bump.py",
-            self.level_to_letter[self.current_level].lower(),
-            self.level_to_letter[self.next_level].lower(),
+            self.current_letter,
+            self.next_letter,
         ])
 
     def copy_matrix(self):
@@ -102,7 +87,7 @@
         next_kernel_configs = check_output(
             """grep -rh name: | sed -E 's/^.*"(.*)".*/\\1/g'""",
             cwd=self.top / "kernel/configs" /
-            self.level_to_letter[self.next_level].lower(),
+            self.next_letter,
             text=True,
             shell=True,
         ).splitlines()
@@ -146,12 +131,18 @@
 
 def main():
     parser = argparse.ArgumentParser(description=__doc__)
-    parser.add_argument("current",
+    parser.add_argument("current_level",
                         type=str,
                         help="VINTF level of the current version (e.g. 9)")
-    parser.add_argument("next",
+    parser.add_argument("next_level",
                         type=str,
                         help="VINTF level of the next version (e.g. 10)")
+    parser.add_argument("current_letter",
+                        type=str,
+                        help="Letter of the API level of the current version (e.g. v)")
+    parser.add_argument("next_letter",
+                        type=str,
+                        help="Letter of the API level of the next version (e.g. w)")
     cmdline_args = parser.parse_args()
 
     Bump(cmdline_args).run()