diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 183bd0c..0f2d7c3 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -36,8 +36,8 @@ jobs:
     - run: pip install ruff pytest httpx
 
     - run: |
-        ruff check konoha
-        ruff format --diff konoha
+        ruff check src
+        ruff format --diff src
     - run: pytest
       env:
         AWS_ACCESS_KEY_ID: ${{ secrets.AWS_ACCESS_KEY_ID }}
diff --git a/pyproject.toml b/pyproject.toml
index 58da92d..d384127 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -7,6 +7,7 @@ version = "5.5.2"
 description = "A tiny sentence/word tokenizer for Japanese text written in Python"
 authors = ["himkt <himkt@klis.tsukuba.ac.jp>"]
 readme = "README.md"
+packages = [{include = "konoha", from = "src" }]
 license = "MIT"
 
 [tool.poetry.dependencies]
diff --git a/konoha/__init__.py b/src/konoha/__init__.py
similarity index 100%
rename from konoha/__init__.py
rename to src/konoha/__init__.py
diff --git a/konoha/api/server.py b/src/konoha/api/server.py
similarity index 100%
rename from konoha/api/server.py
rename to src/konoha/api/server.py
diff --git a/konoha/api/v1/batch_tokenization.py b/src/konoha/api/v1/batch_tokenization.py
similarity index 100%
rename from konoha/api/v1/batch_tokenization.py
rename to src/konoha/api/v1/batch_tokenization.py
diff --git a/konoha/api/v1/tokenization.py b/src/konoha/api/v1/tokenization.py
similarity index 100%
rename from konoha/api/v1/tokenization.py
rename to src/konoha/api/v1/tokenization.py
diff --git a/konoha/data/__init__.py b/src/konoha/data/__init__.py
similarity index 100%
rename from konoha/data/__init__.py
rename to src/konoha/data/__init__.py
diff --git a/konoha/data/resource.py b/src/konoha/data/resource.py
similarity index 100%
rename from konoha/data/resource.py
rename to src/konoha/data/resource.py
diff --git a/konoha/data/token.py b/src/konoha/data/token.py
similarity index 100%
rename from konoha/data/token.py
rename to src/konoha/data/token.py
diff --git a/konoha/sentence_tokenizer.py b/src/konoha/sentence_tokenizer.py
similarity index 100%
rename from konoha/sentence_tokenizer.py
rename to src/konoha/sentence_tokenizer.py
diff --git a/konoha/word_tokenizer.py b/src/konoha/word_tokenizer.py
similarity index 100%
rename from konoha/word_tokenizer.py
rename to src/konoha/word_tokenizer.py
diff --git a/konoha/word_tokenizers/__init__.py b/src/konoha/word_tokenizers/__init__.py
similarity index 100%
rename from konoha/word_tokenizers/__init__.py
rename to src/konoha/word_tokenizers/__init__.py
diff --git a/konoha/word_tokenizers/character_tokenizer.py b/src/konoha/word_tokenizers/character_tokenizer.py
similarity index 100%
rename from konoha/word_tokenizers/character_tokenizer.py
rename to src/konoha/word_tokenizers/character_tokenizer.py
diff --git a/konoha/word_tokenizers/janome_tokenizer.py b/src/konoha/word_tokenizers/janome_tokenizer.py
similarity index 100%
rename from konoha/word_tokenizers/janome_tokenizer.py
rename to src/konoha/word_tokenizers/janome_tokenizer.py
diff --git a/konoha/word_tokenizers/kytea_tokenizer.py b/src/konoha/word_tokenizers/kytea_tokenizer.py
similarity index 100%
rename from konoha/word_tokenizers/kytea_tokenizer.py
rename to src/konoha/word_tokenizers/kytea_tokenizer.py
diff --git a/konoha/word_tokenizers/mecab_tokenizer.py b/src/konoha/word_tokenizers/mecab_tokenizer.py
similarity index 100%
rename from konoha/word_tokenizers/mecab_tokenizer.py
rename to src/konoha/word_tokenizers/mecab_tokenizer.py
diff --git a/konoha/word_tokenizers/nagisa_tokenizer.py b/src/konoha/word_tokenizers/nagisa_tokenizer.py
similarity index 100%
rename from konoha/word_tokenizers/nagisa_tokenizer.py
rename to src/konoha/word_tokenizers/nagisa_tokenizer.py
diff --git a/konoha/word_tokenizers/sentencepiece_tokenizer.py b/src/konoha/word_tokenizers/sentencepiece_tokenizer.py
similarity index 100%
rename from konoha/word_tokenizers/sentencepiece_tokenizer.py
rename to src/konoha/word_tokenizers/sentencepiece_tokenizer.py
diff --git a/konoha/word_tokenizers/sudachi_tokenizer.py b/src/konoha/word_tokenizers/sudachi_tokenizer.py
similarity index 100%
rename from konoha/word_tokenizers/sudachi_tokenizer.py
rename to src/konoha/word_tokenizers/sudachi_tokenizer.py
diff --git a/konoha/word_tokenizers/tokenizer.py b/src/konoha/word_tokenizers/tokenizer.py
similarity index 100%
rename from konoha/word_tokenizers/tokenizer.py
rename to src/konoha/word_tokenizers/tokenizer.py
diff --git a/konoha/word_tokenizers/whitespace_tokenizer.py b/src/konoha/word_tokenizers/whitespace_tokenizer.py
similarity index 100%
rename from konoha/word_tokenizers/whitespace_tokenizer.py
rename to src/konoha/word_tokenizers/whitespace_tokenizer.py