diff --git a/src-python/models/transliteration/transliteration_context_rules.py b/src-python/models/transliteration/transliteration_context_rules.py
index d0b5d339..35c25ec1 100644
--- a/src-python/models/transliteration/transliteration_context_rules.py
+++ b/src-python/models/transliteration/transliteration_context_rules.py
@@ -1,4 +1,4 @@
-from typing import List, Dict
+from typing import List, Dict, Any
 import re
 
 """Contextual transliteration rules for tokenized results.
@@ -33,7 +33,7 @@ DEFAULT_RULES = {
 
 
 
-def apply_context_rules(results: List[Dict], use_macron: bool = False) -> List[Dict]:
+def apply_context_rules(results: List[Dict[str, Any]], use_macron: bool = False) -> List[Dict[str, Any]]:
     """Apply contextual rewrite rules to `results`.
 
     Parameters
@@ -50,7 +50,7 @@ def apply_context_rules(results: List[Dict], use_macron: bool = False) -> List[D
     """
 
     # prepare rules: sort by priority (desc) and precompile regex where provided
-    raw_rules = DEFAULT_RULES.get("rules", [])
+    raw_rules: List[Dict[str, Any]] = DEFAULT_RULES.get("rules", [])
     rules = sorted(raw_rules, key=lambda r: r.get("priority", 0), reverse=True)
     for r in rules:
         if r.get("match_mode") == "regex" and r.get("pattern"):
diff --git a/src-python/models/transliteration/transliteration_kana_to_hepburn.py b/src-python/models/transliteration/transliteration_kana_to_hepburn.py
index e7ba04c2..d8c2b016 100644
--- a/src-python/models/transliteration/transliteration_kana_to_hepburn.py
+++ b/src-python/models/transliteration/transliteration_kana_to_hepburn.py
@@ -1,5 +1,7 @@
 # katakana_to_hepburn.py
 # カタカナ -> ヘボン式ローマ字（パッケージ不要）
+from typing import List
+
 
 def katakana_to_hepburn(kata: str, use_macron: bool = True) -> str:
     """
@@ -8,7 +10,7 @@ def katakana_to_hepburn(kata: str, use_macron: bool = True) -> str:
     use_macron=False のときは単純に連続母音を残す（例: ou, oo）。
     """
     # 基本音の対応（主要なカタカナ）
-    base = {
+    base: dict = {
         'ア':'a','イ':'i','ウ':'u','エ':'e','オ':'o',
         'カ':'ka','キ':'ki','ク':'ku','ケ':'ke','コ':'ko',
         'サ':'sa','シ':'shi','ス':'su','セ':'se','ソ':'so',
@@ -31,7 +33,7 @@ def katakana_to_hepburn(kata: str, use_macron: bool = True) -> str:
     }
 
     # 拡張：子音 + 小ャユョ の組合せ（主要なもの）
-    digraphs = {
+    digraphs: dict = {
         ('キ','ャ'):'kya', ('キ','ュ'):'kyu', ('キ','ョ'):'kyo',
         ('ギ','ャ'):'gya', ('ギ','ュ'):'gyu', ('ギ','ョ'):'gyo',
         ('シ','ャ'):'sha', ('シ','ュ'):'shu', ('シ','ョ'):'sho',
@@ -49,8 +51,8 @@ def katakana_to_hepburn(kata: str, use_macron: bool = True) -> str:
         # F-sounds (ファ フィ フェ フォ)
         ('フ','ァ'):'fa', ('フ','ィ'):'fi', ('フ','ェ'):'fe', ('フ','ォ'):'fo',
         # シェ チェ ティ etc.
-        ('シ','ェ'):'she', ('チ','ェ'):'che',
-        ('テ','ィ'):'ti', ('ト','ゥ'):'tu', ('ド','ゥ'):'du',
+    ('シ','ェ'):'she', ('チ','ェ'):'che',
+    ('テ','ィ'):'ti',
         ('ウ','ァ'):'wa', ('ウ','ィ'):'wi', ('ウ','ェ'):'we', ('ウ','ォ'):'wo',
         # その他外来語によくある組合せ
         ('ス','ィ'):'si', ('ズ','ィ'):'zi', ('ツ','ァ'):'tsa', ('ツ','ィ'):'tsi', ('ツ','ェ'):'tse', ('ツ','ォ'):'tso',
@@ -78,7 +80,7 @@ def katakana_to_hepburn(kata: str, use_macron: bool = True) -> str:
         return rom  # 母音がないなら全部
 
     # 変換メイン
-    res = []
+    res: List[str] = []
     i = 0
     kata = kata.strip()
     length = len(kata)
diff --git a/src-python/models/transliteration/transliteration_transliterator.py b/src-python/models/transliteration/transliteration_transliterator.py
index e25b3be4..8aff912e 100644
--- a/src-python/models/transliteration/transliteration_transliterator.py
+++ b/src-python/models/transliteration/transliteration_transliterator.py
@@ -1,5 +1,6 @@
 from sudachipy import tokenizer
 from sudachipy import dictionary
+from typing import List, Dict, Any
 try:
     from .transliteration_kana_to_hepburn import katakana_to_hepburn
 except ImportError:
@@ -10,7 +11,7 @@ except ImportError:
     from transliteration_context_rules import apply_context_rules
 
 class Transliterator:
-    def __init__(self):
+    def __init__(self) -> None:
         self.tokenizer_obj = dictionary.Dictionary(dict_type="full").create()
         self.mode = tokenizer.Tokenizer.SplitMode.C
 
@@ -26,7 +27,7 @@ class Transliterator:
         )
 
     @staticmethod
-    def split_kanji_okurigana(surface: str, reading_kana: str, use_macron: bool = True):
+    def split_kanji_okurigana(surface: str, reading_kana: str, use_macron: bool = True) -> List[Dict[str, str]]:
         """Split a single surface word and its kana reading into parts.
 
         Inputs:
@@ -45,7 +46,7 @@ class Transliterator:
           constructed list.
         """
 
-        result = []
+        result: List[Dict[str, str]] = []
 
         # 表層を「漢字ブロック」と「非漢字ブロック」に分割
         buf = ""
@@ -113,7 +114,7 @@ class Transliterator:
 
         return result
 
-    def analyze(self, text: str, use_macron: bool = False):
+    def analyze(self, text: str, use_macron: bool = False) -> List[Dict[str, Any]]:
         """Tokenize ``text`` and produce per-subunit reading information.
 
         Returns a list of dicts for each token/sub-part with keys:
@@ -133,7 +134,7 @@ class Transliterator:
 
         tokens = self.tokenizer_obj.tokenize(text, self.mode)
 
-        results = []
+        results: List[Dict[str, Any]] = []
         for t in tokens:
             surface = t.surface()
             reading = t.reading_form()