diff --git a/.vscode/settings.json b/.vscode/settings.json
index e64211a..97d59ff 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -6,5 +6,10 @@
             "source.organizeImports": "explicit"
         },
         "editor.defaultFormatter": "charliermarsh.ruff"
-    }
+    },
+    "python.testing.pytestArgs": [
+        "src/"
+    ],
+    "python.testing.unittestEnabled": false,
+    "python.testing.pytestEnabled": true
 }
\ No newline at end of file
diff --git a/src/config.py b/src/config.py
index 02ec31f..00614e5 100644
--- a/src/config.py
+++ b/src/config.py
@@ -1,7 +1,45 @@
-import os
+from __future__ import annotations
 
-from dotenv import load_dotenv
+import os
+from pathlib import Path
+from typing import TYPE_CHECKING, ClassVar
+
+from dotenv import dotenv_values, load_dotenv, set_key, unset_key
+
+if TYPE_CHECKING:
+    from collections import OrderedDict
+
+config_path = Path(__file__).parent.resolve()
+DOT_ENV_PATH = Path(config_path, ".env")
+DOT_ENV_PATH.touch(mode=0o600, exist_ok=True)
 
 load_dotenv()
 
+VERSION = "1.5"
 NOTION_TOKEN = os.getenv("NOTION_TOKEN")
+
+
+class Config:
+    env_dict: ClassVar[OrderedDict[str, str]] = {}
+    dot_env_path = DOT_ENV_PATH
+
+    @staticmethod
+    def init(dotenv_path: str = DOT_ENV_PATH) -> None:
+        Config.dot_env_path = dotenv_path
+        Config.env_dict = dotenv_values(dotenv_path=dotenv_path)
+
+    @staticmethod
+    def get_env(key: str) -> str | None:
+        if key in Config.env_dict:
+            return Config.env_dict[key]
+        return None
+
+    @staticmethod
+    def update_env(key: str, value: str) -> None:
+        set_key(Config.dot_env_path, key, value)
+        Config.env_dict = dotenv_values(dotenv_path=Config.dot_env_path)
+
+    @staticmethod
+    def remove_env(key: str) -> None:
+        unset_key(Config.dot_env_path, key)
+        Config.env_dict = dotenv_values(dotenv_path=Config.dot_env_path)
diff --git a/src/tests/__init__.py b/src/tests/__init__.py
new file mode 100644
index 0000000..e69de29
diff --git a/src/tests/test_config.py b/src/tests/test_config.py
new file mode 100644
index 0000000..26ccde5
--- /dev/null
+++ b/src/tests/test_config.py
@@ -0,0 +1,70 @@
+from collections import OrderedDict
+from pathlib import Path
+
+import pytest
+from dotenv import dotenv_values, set_key
+
+from src.config import Config
+
+CONFIG_PATH = Path(__file__).parent.resolve()
+TEST_DOT_ENV_PATH = Path(CONFIG_PATH, ".env_test")
+
+EXPECTED_ENV_DICT: OrderedDict[str, str] = OrderedDict(
+    {
+        "KEY_1": "VALUE_1",
+        "KEY_2": "VALUE_2",
+        "NOTION_TOKEN": "1234454_234324",
+    },
+)
+
+
+@pytest.fixture()
+def _prepare_test_dot_env() -> any:
+    TEST_DOT_ENV_PATH.touch(mode=0o600, exist_ok=True)
+    for key, value in EXPECTED_ENV_DICT.items():
+        set_key(TEST_DOT_ENV_PATH, key, value)
+    yield
+    TEST_DOT_ENV_PATH.unlink()
+
+
+@pytest.fixture()
+def _load_test_dot_env(_prepare_test_dot_env: any) -> None:
+    Config.init(dotenv_path=TEST_DOT_ENV_PATH)
+
+
+@pytest.mark.usefixtures("_prepare_test_dot_env")
+def test_init_config() -> None:
+    assert Config.env_dict == {}
+    Config.init(dotenv_path=TEST_DOT_ENV_PATH)
+    assert Config.env_dict == EXPECTED_ENV_DICT
+    dict_from_file = dotenv_values(dotenv_path=TEST_DOT_ENV_PATH)
+    assert dict_from_file == EXPECTED_ENV_DICT
+
+
+@pytest.mark.usefixtures("_load_test_dot_env")
+def test_get_config() -> None:
+    assert Config.get_env("NON_EXISTING_KEY") is None
+    key_1 = "KEY_1"
+    assert Config.get_env(key_1) == EXPECTED_ENV_DICT[key_1]
+
+
+@pytest.mark.usefixtures("_load_test_dot_env")
+def test_update_config() -> None:
+    key = "KEY_1"
+    value = EXPECTED_ENV_DICT[key]
+    new_value = "NEW_VALUE"
+    assert Config.get_env(key) == value
+    Config.update_env(key, new_value)
+    assert Config.get_env(key) == new_value
+    dict_from_file = dotenv_values(dotenv_path=TEST_DOT_ENV_PATH)
+    assert dict_from_file[key] == new_value
+
+
+@pytest.mark.usefixtures("_load_test_dot_env")
+def test_remove_config() -> None:
+    key = "KEY_1"
+    assert Config.get_env(key) == EXPECTED_ENV_DICT[key]
+    Config.remove_env(key)
+    assert Config.get_env(key) is None
+    dict_from_file = dotenv_values(dotenv_path=TEST_DOT_ENV_PATH)
+    assert key not in dict_from_file