diff --git a/lean/commands/backtest.py b/lean/commands/backtest.py
index 6f412467..779b07fd 100644
--- a/lean/commands/backtest.py
+++ b/lean/commands/backtest.py
@@ -366,7 +366,7 @@ def backtest(project: Path,
     engine_image = cli_config_manager.get_engine_image(image or project_config.get("engine-image", None))
 
     container_module_version = container.docker_manager.get_image_label(engine_image,
-                                                                        CONTAINER_LABEL_LEAN_VERSION_NAME, "Unknown")
+                                                                        CONTAINER_LABEL_LEAN_VERSION_NAME, None)
 
     if data_provider_historical is not None:
         data_provider = non_interactive_config_build_for_name(lean_config, data_provider_historical,
diff --git a/lean/commands/data/download.py b/lean/commands/data/download.py
index d85d9486..8cc88ef0 100644
--- a/lean/commands/data/download.py
+++ b/lean/commands/data/download.py
@@ -684,8 +684,7 @@ def download(ctx: Context,
         container.update_manager.pull_docker_image_if_necessary(engine_image, update, no_update)
 
         container_module_version = container.docker_manager.get_image_label(engine_image,
-                                                                            CONTAINER_LABEL_LEAN_VERSION_NAME,
-                                                                            "Unknown")
+                                                                            CONTAINER_LABEL_LEAN_VERSION_NAME, None)
 
         data_downloader_provider = config_build_for_name(lean_config, data_downloader_provider.get_name(),
                                                          cli_data_downloaders, kwargs, logger, interactive=True)
diff --git a/lean/commands/live/deploy.py b/lean/commands/live/deploy.py
index 10c3a9ee..ad600fae 100644
--- a/lean/commands/live/deploy.py
+++ b/lean/commands/live/deploy.py
@@ -278,7 +278,7 @@ def deploy(project: Path,
     engine_image = cli_config_manager.get_engine_image(image or project_config.get("engine-image", None))
 
     container_module_version = container.docker_manager.get_image_label(engine_image,
-                                                                        CONTAINER_LABEL_LEAN_VERSION_NAME, "Unknown")
+                                                                        CONTAINER_LABEL_LEAN_VERSION_NAME, None)
 
     organization_id = container.organization_manager.try_get_working_organization_id()
     paths_to_mount = {}
diff --git a/lean/commands/optimize.py b/lean/commands/optimize.py
index 031358a5..cd361121 100644
--- a/lean/commands/optimize.py
+++ b/lean/commands/optimize.py
@@ -307,7 +307,8 @@ def optimize(project: Path,
 
     paths_to_mount = None
 
-    container_module_version = container.docker_manager.get_image_label(engine_image,                                                                 CONTAINER_LABEL_LEAN_VERSION_NAME, "Unknown")
+    container_module_version = container.docker_manager.get_image_label(engine_image,
+                                                                        CONTAINER_LABEL_LEAN_VERSION_NAME, None)
 
     if data_provider_historical is not None:
         data_provider = non_interactive_config_build_for_name(lean_config, data_provider_historical,
diff --git a/lean/commands/research.py b/lean/commands/research.py
index 42aa44d5..604c92a4 100644
--- a/lean/commands/research.py
+++ b/lean/commands/research.py
@@ -122,7 +122,7 @@ def research(project: Path,
     container.update_manager.pull_docker_image_if_necessary(research_image, update, no_update)
 
     container_module_version = container.docker_manager.get_image_label(research_image,
-                                                                        CONTAINER_LABEL_LEAN_VERSION_NAME, "Unknown")
+                                                                        CONTAINER_LABEL_LEAN_VERSION_NAME, None)
 
     if str(research_image) != DEFAULT_RESEARCH_IMAGE:
         logger.warn(f'A custom research image: "{research_image}" is being used!')