diff --git a/README.md b/README.md
index 9703dc2..f1685be 100644
--- a/README.md
+++ b/README.md
@@ -23,7 +23,7 @@ database:
   user: $DATABASE_USER
   timeout: $DATABASE_TIMEOUT?
 environment: development
-is-debug: true
+is_debug: true
 ```
 
 `config.py`
diff --git a/pyproject.toml b/pyproject.toml
index 895d05b..5ebaea4 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "pyamldantic"
-version = "1.1.0"
+version = "1.2.0"
 description = "Validate and serialize YAML config files with Pydantic, with support for environment variables."
 readme = "README.md"
 authors = [
diff --git a/src/pyamldantic/config.py b/src/pyamldantic/config.py
index b3fb542..0226fb0 100644
--- a/src/pyamldantic/config.py
+++ b/src/pyamldantic/config.py
@@ -47,7 +47,6 @@ def load(cls, path: str, *, schema: type[T]) -> T:
             except ScannerError as e:
                 raise InvalidYAMLError(path, e) from None
 
-        cls._normalize_keys(data)
         cls._set_env_vars(data)
 
         try:
@@ -58,23 +57,6 @@ def load(cls, path: str, *, schema: type[T]) -> T:
 
     # Private methods
 
-    @classmethod
-    def _normalize_keys(cls, data: dict[str, Any]) -> None:
-        """
-        Replace dashes in keys with underscores.
-
-        :param data: The data to process
-        :type data: dict[str, Any]
-        """
-        for k in list(data.keys()):
-            new_key = k.replace("-", "_")
-
-            if new_key != k:
-                data[new_key] = data.pop(k)
-
-            if isinstance(data[new_key], dict):
-                cls._normalize_keys(data[new_key])
-
     @classmethod
     def _set_env_vars(cls, data: dict[str, Any]) -> None:
         """
diff --git a/tests/fixtures/config.yaml b/tests/fixtures/config.yaml
index 8f00f87..537a05e 100644
--- a/tests/fixtures/config.yaml
+++ b/tests/fixtures/config.yaml
@@ -6,4 +6,4 @@ database:
   user: $DATABASE_USER
   timeout: $DATABASE_TIMEOUT?
 environment: testing
-is-debug: true
+is_debug: true
diff --git a/uv.lock b/uv.lock
index 7b45201..6e18ed5 100644
--- a/uv.lock
+++ b/uv.lock
@@ -165,7 +165,7 @@ wheels = [
 
 [[package]]
 name = "pyamldantic"
-version = "1.1.0"
+version = "1.2.0"
 source = { editable = "." }
 dependencies = [
     { name = "pydantic" },