diff --git a/test/version/from_config_test.py b/test/version/from_config_test.py
index f76cacd..3624f93 100644
--- a/test/version/from_config_test.py
+++ b/test/version/from_config_test.py
@@ -4,6 +4,18 @@
 from valhalla.version.version_to_release import VersionToRelease, ReleaseKind
 
 
+class _VersionConfig:
+    """Stub for VersionConfig used in tests."""
+    def __init__(self, from_command=None):
+        self.from_command = from_command
+
+
+class _Cfg:
+    """Stub for Config used in tests - uses version_config attribute."""
+    def __init__(self, version_config):
+        self.version_config = version_config
+
+
 class VersionFromCommandTest(unittest.TestCase):
 
     @patch('valhalla.common.executor.Executor.run')
@@ -12,49 +24,118 @@ def test_from_config_executes_command_and_sets_version(self, mock_executor_run):
         from valhalla.common.executor import ExecutionResult
         mock_executor_run.return_value = ExecutionResult(0, '1.2.3', '')
 
-        # Minimal config stub to match the current implementation (expects config.version)
-        class _Version:
-            def __init__(self, from_command):
-                self.from_command = from_command
+        vtr = VersionToRelease('', ReleaseKind('valhalla.yml', '', '.'))
 
-        class _Cfg:
-            def __init__(self, from_command):
-                self.version = _Version(from_command)
+        # when:
+        vtr.from_config(_Cfg(_VersionConfig('echo 1.2.3')))
 
+        # then:
+        self.assertEqual('1.2.3', vtr.version_number_to_release)
+        mock_executor_run.assert_called_once_with('echo 1.2.3')
+
+    @patch('valhalla.version.version_to_release.info')
+    def test_from_config_skips_when_version_config_is_none(self, mock_info):
+        # given:
         vtr = VersionToRelease('', ReleaseKind('valhalla.yml', '', '.'))
 
         # when:
-        vtr.from_config(_Cfg('echo 1.2.3'))
+        vtr.from_config(_Cfg(None))
 
-        # then
-        self.assertEqual('1.2.3', vtr.version_number_to_release)
-        mock_executor_run.assert_called_once()
+        # then:
+        self.assertEqual('', vtr.version_number_to_release)
+        mock_info.assert_called_with("Version is not specified in valhalla.yml, skipping")
 
     @patch('valhalla.version.version_to_release.info')
-    def test_from_config_skips_when_no_command(self, mock_info):
+    def test_from_config_skips_when_from_command_is_none(self, mock_info):
         # given:
-        class _Cfg:
-            def __init__(self, version):
-                self.version = version
+        vtr = VersionToRelease('', ReleaseKind('valhalla.yml', '', '.'))
+
+        # when:
+        vtr.from_config(_Cfg(_VersionConfig(None)))
 
+        # then:
+        self.assertEqual('', vtr.version_number_to_release)
+        mock_info.assert_called_with("Version is not specified in valhalla.yml, skipping")
+
+    @patch('valhalla.version.version_to_release.info')
+    def test_from_config_skips_when_from_command_is_empty(self, mock_info):
+        # given:
         vtr = VersionToRelease('', ReleaseKind('valhalla.yml', '', '.'))
 
-        # None version
-        vtr.from_config(_Cfg(None))
+        # when:
+        vtr.from_config(_Cfg(_VersionConfig('')))
 
-        # Empty from_command
-        class _V:
-            def __init__(self, fc=None):
-                self.from_command = fc
+        # then:
+        self.assertEqual('', vtr.version_number_to_release)
+        mock_info.assert_called_with("Version is not specified in valhalla.yml, skipping")
+
+    @patch('valhalla.version.version_to_release.info')
+    def test_from_config_skips_when_from_command_is_whitespace(self, mock_info):
+        # given:
+        vtr = VersionToRelease('', ReleaseKind('valhalla.yml', '', '.'))
 
         # when:
-        vtr.from_config(_Cfg(_V(None)))
-        v = _V('   ')
-        vtr.from_config(_Cfg(v))
+        vtr.from_config(_Cfg(_VersionConfig('   ')))
 
         # then:
         self.assertEqual('', vtr.version_number_to_release)
-        mock_info.assert_called()
+        mock_info.assert_called_with("Version is not specified in valhalla.yml, skipping")
+
+    @patch('valhalla.common.executor.Executor.run')
+    def test_from_config_does_not_change_version_when_executor_returns_none(self, mock_executor_run):
+        # given:
+        mock_executor_run.return_value = None
+        vtr = VersionToRelease('original', ReleaseKind('valhalla.yml', '', '.'))
+
+        # when:
+        vtr.from_config(_Cfg(_VersionConfig('some-command')))
+
+        # then:
+        self.assertEqual('original', vtr.version_number_to_release)
+        mock_executor_run.assert_called_once_with('some-command')
+
+    @patch('valhalla.common.executor.Executor.run')
+    def test_from_config_overwrites_existing_version(self, mock_executor_run):
+        # given:
+        from valhalla.common.executor import ExecutionResult
+        mock_executor_run.return_value = ExecutionResult(0, '2.0.0', '')
+
+        vtr = VersionToRelease('1.0.0', ReleaseKind('valhalla.yml', '', '.'))
+
+        # when:
+        vtr.from_config(_Cfg(_VersionConfig('get-version')))
+
+        # then:
+        self.assertEqual('2.0.0', vtr.version_number_to_release)
+
+    @patch('valhalla.common.executor.Executor.run')
+    def test_from_config_works_with_real_config_class(self, mock_executor_run):
+        # given:
+        from valhalla.common.executor import ExecutionResult
+        from valhalla.common.get_config import Config, VersionConfig, CommitConfig, ReleaseConfig, \
+            ReleaseDescriptionConfig, ReleaseAssetsConfig, TagConfig, MergeRequestConfig
+
+        mock_executor_run.return_value = ExecutionResult(0, '3.5.0', '')
+
+        config = Config(
+            version_config=VersionConfig('echo 3.5.0'),
+            variables={},
+            git_host='github',
+            commit_before_release=None,
+            release_config=ReleaseConfig(ReleaseDescriptionConfig(''), [], None, ReleaseAssetsConfig([], [])),
+            tag_config=None,
+            commit_after_release=None,
+            merge_request=MergeRequestConfig(True, '', '', '', [])
+        )
+
+        vtr = VersionToRelease('', ReleaseKind('valhalla.yml', '', '.'))
+
+        # when:
+        vtr.from_config(config)
+
+        # then:
+        self.assertEqual('3.5.0', vtr.version_number_to_release)
+        mock_executor_run.assert_called_once_with('echo 3.5.0')
 
 
 if __name__ == '__main__':
diff --git a/valhalla/version/version_to_release.py b/valhalla/version/version_to_release.py
index 4f1aced..9938682 100644
--- a/valhalla/version/version_to_release.py
+++ b/valhalla/version/version_to_release.py
@@ -32,11 +32,11 @@ def is_version_empty(self):
         return self.version_number_to_release is None or self.version_number_to_release.strip() == ""
 
     def from_config(self, config):
-        if config.version is None or config.version.from_command is None or config.version.from_command.strip() == "":
+        if config.version_config is None or config.version_config.from_command is None or config.version_config.from_command.strip() == "":
             info("Version is not specified in valhalla.yml, skipping")
             return
         else:
-            self.__get_version_from_command(config.version.from_command)
+            self.__get_version_from_command(config.version_config.from_command)
         pass
 
     def __get_version_from_command(self, from_command: str):