diff --git a/aioddd/__init__.py b/aioddd/__init__.py
index 3c7370b..9ccaeb4 100644
--- a/aioddd/__init__.py
+++ b/aioddd/__init__.py
@@ -43,7 +43,7 @@
     find_event_mapper_by_name,
     find_event_mapper_by_type,
 )
-from .utils import env, env_resolver, get_env, get_simple_logger
+from .utils import env, get_env, get_simple_logger
 from .value_objects import Id, StrDateTime, Timestamp
 
 __all__ = (
@@ -91,7 +91,6 @@
     # utils
     'get_env',
     'get_simple_logger',
-    'env_resolver',
     'env',
     # value_objects
     'Id',
diff --git a/aioddd/utils.py b/aioddd/utils.py
index dfd1bda..18437cb 100644
--- a/aioddd/utils.py
+++ b/aioddd/utils.py
@@ -28,17 +28,15 @@ def get_simple_logger(
 _ENV: Optional[Dict[str, Any]] = None
 
 
-def env_resolver() -> Optional[Dict[str, Any]]:
-    """Override this method to use below env method to automatically cache and get type validations magically."""
-    return {}
-
-
 def env(key: Optional[str] = None, typ: Optional[Type[_T]] = None) -> _T:
+    """Get full environment variables resolved if no argument given or env var matching key and optional type given."""
     global _ENV
-    if not _ENV:
-        _ENV = env_resolver() or {}
-    if not key:
+    if _ENV is None:
+        _ENV = env.resolver()  # type: ignore
+    if key is None:
         return _ENV  # type: ignore
+    if not isinstance(_ENV, dict):
+        raise ValueError('"_ENV" variable must be a dict. Check env.resolver method.')
     if key not in _ENV:
         raise KeyError(
             '<{0}{1}> does not exist as environment variable'.format(key, ': {0}'.format(typ.__name__) if typ else '')
@@ -49,3 +47,6 @@ def env(key: Optional[str] = None, typ: Optional[Type[_T]] = None) -> _T:
             '<{0}{1}> does not exist as environment variable'.format(key, ': {0}'.format(typ.__name__) if typ else '')
         )
     return val
+
+
+env.resolver = lambda: None  # type: ignore
diff --git a/pyproject.toml b/pyproject.toml
index 648c79f..034aff1 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [metadata]
 name = "aioddd"
-version = "1.3.0"
+version = "1.3.1"
 description = "Async Python DDD utilities library."
 license = "MIT"
 authors = ["ticdenis <denisnavarroalcaide@outlook.es>"]
@@ -32,7 +32,7 @@ uuid = "1.30"
 [tool.pylint.master]
 jobs = "0"
 [tool.pylint.messages_control]
-disable = "C0103,C0114,C0115,C0116,C0205,C0209,C0301,E0401,E0611,E1136,R0903,R1704,R1725,W0108,W0212,W0235,W0236,W0603,W0611,W0622,W0707,W1202"
+disable = "C0103,C0114,C0115,C0116,C0205,C0209,C0301,E0401,E0611,E1135,E1136,R0903,R1704,R1725,W0108,W0212,W0235,W0236,W0603,W0611,W0622,W0707,W1202"
 
 [tool.pytest.ini_options]
 cache_dir = "var/cache/.pytest_cache"