diff --git a/commitizen/config/base_config.py b/commitizen/config/base_config.py
index 4b8f5f05f..272a38574 100644
--- a/commitizen/config/base_config.py
+++ b/commitizen/config/base_config.py
@@ -1,7 +1,7 @@
 from __future__ import annotations
 
 from pathlib import Path
-from typing import TYPE_CHECKING, Any
+from typing import TYPE_CHECKING
 
 from commitizen.defaults import DEFAULT_SETTINGS, Settings
 
@@ -33,11 +33,10 @@ def path(self) -> Path:
     def path(self, path: str | Path) -> None:
         self._path = Path(path)
 
-    def set_key(self, key: str, value: Any) -> Self:
-        """Set or update a key in the conf.
+    def set_key(self, key: str, value: object) -> Self:
+        """Set or update a key in the config file.
 
-        For now only strings are supported.
-        We use to update the version number.
+        Currently, only strings are supported for the parameter key.
         """
         raise NotImplementedError()
 
diff --git a/commitizen/config/json_config.py b/commitizen/config/json_config.py
index be1f1c36b..a117209f8 100644
--- a/commitizen/config/json_config.py
+++ b/commitizen/config/json_config.py
@@ -2,7 +2,7 @@
 
 import json
 from pathlib import Path
-from typing import TYPE_CHECKING, Any
+from typing import TYPE_CHECKING
 
 from commitizen.exceptions import InvalidConfigurationError
 from commitizen.git import smart_open
@@ -30,18 +30,13 @@ def init_empty_config_content(self) -> None:
         with smart_open(self.path, "a", encoding=self.encoding) as json_file:
             json.dump({"commitizen": {}}, json_file)
 
-    def set_key(self, key: str, value: Any) -> Self:
-        """Set or update a key in the conf.
-
-        For now only strings are supported.
-        We use to update the version number.
-        """
+    def set_key(self, key: str, value: object) -> Self:
         with open(self.path, "rb") as f:
-            parser = json.load(f)
+            config_doc = json.load(f)
 
-        parser["commitizen"][key] = value
+        config_doc["commitizen"][key] = value
         with smart_open(self.path, "w", encoding=self.encoding) as f:
-            json.dump(parser, f, indent=2)
+            json.dump(config_doc, f, indent=2)
         return self
 
     def _parse_setting(self, data: bytes | str) -> None:
diff --git a/commitizen/config/toml_config.py b/commitizen/config/toml_config.py
index 2164d3f99..a3bfc4811 100644
--- a/commitizen/config/toml_config.py
+++ b/commitizen/config/toml_config.py
@@ -2,9 +2,9 @@
 
 import os
 from pathlib import Path
-from typing import TYPE_CHECKING, Any
+from typing import TYPE_CHECKING
 
-from tomlkit import exceptions, parse, table
+from tomlkit import TOMLDocument, exceptions, parse, table
 
 from commitizen.exceptions import InvalidConfigurationError
 
@@ -28,30 +28,26 @@ def __init__(self, *, data: bytes | str, path: Path | str) -> None:
         self._parse_setting(data)
 
     def init_empty_config_content(self) -> None:
+        config_doc = TOMLDocument()
         if os.path.isfile(self.path):
             with open(self.path, "rb") as input_toml_file:
-                parser = parse(input_toml_file.read())
-        else:
-            parser = parse("")
+                config_doc = parse(input_toml_file.read())
 
-        with open(self.path, "wb") as output_toml_file:
-            if parser.get("tool") is None:
-                parser["tool"] = table()
-            parser["tool"]["commitizen"] = table()  # type: ignore[index]
-            output_toml_file.write(parser.as_string().encode(self.encoding))
+        if config_doc.get("tool") is None:
+            config_doc["tool"] = table()
+        config_doc["tool"]["commitizen"] = table()  # type: ignore[index]
 
-    def set_key(self, key: str, value: Any) -> Self:
-        """Set or update a key in the conf.
+        with open(self.path, "wb") as output_toml_file:
+            output_toml_file.write(config_doc.as_string().encode(self.encoding))
 
-        For now only strings are supported.
-        We use to update the version number.
-        """
+    def set_key(self, key: str, value: object) -> Self:
         with open(self.path, "rb") as f:
-            parser = parse(f.read())
+            config_doc = parse(f.read())
 
-        parser["tool"]["commitizen"][key] = value  # type: ignore[index]
+        config_doc["tool"]["commitizen"][key] = value  # type: ignore[index]
         with open(self.path, "wb") as f:
-            f.write(parser.as_string().encode(self.encoding))
+            f.write(config_doc.as_string().encode(self.encoding))
+
         return self
 
     def _parse_setting(self, data: bytes | str) -> None:
diff --git a/commitizen/config/yaml_config.py b/commitizen/config/yaml_config.py
index f2a79e693..cd8ef447e 100644
--- a/commitizen/config/yaml_config.py
+++ b/commitizen/config/yaml_config.py
@@ -1,7 +1,7 @@
 from __future__ import annotations
 
 from pathlib import Path
-from typing import TYPE_CHECKING, Any
+from typing import TYPE_CHECKING
 
 import yaml
 
@@ -51,17 +51,12 @@ def _parse_setting(self, data: bytes | str) -> None:
         except (KeyError, TypeError):
             self.is_empty_config = True
 
-    def set_key(self, key: str, value: Any) -> Self:
-        """Set or update a key in the conf.
-
-        For now only strings are supported.
-        We use to update the version number.
-        """
+    def set_key(self, key: str, value: object) -> Self:
         with open(self.path, "rb") as yaml_file:
-            parser = yaml.load(yaml_file, Loader=yaml.FullLoader)
+            config_doc = yaml.load(yaml_file, Loader=yaml.FullLoader)
 
-        parser["commitizen"][key] = value
+        config_doc["commitizen"][key] = value
         with smart_open(self.path, "w", encoding=self.encoding) as yaml_file:
-            yaml.dump(parser, yaml_file, explicit_start=True)
+            yaml.dump(config_doc, yaml_file, explicit_start=True)
 
         return self