diff --git a/docs/04_upgrading/upgrading_to_v4.md b/docs/04_upgrading/upgrading_to_v4.md
index edb105a7..d5491add 100644
--- a/docs/04_upgrading/upgrading_to_v4.md
+++ b/docs/04_upgrading/upgrading_to_v4.md
@@ -31,7 +31,7 @@ await Actor.charge('my-event', count=5)
 
 ## Removal of deprecated APIs
 
-Methods and arguments that had been deprecated in v3 are removed in v4.
+Methods and arguments that had been deprecated in v3 are removed in v4, along with a few `Configuration` fields that the SDK never read.
 
 ### api_public_base_url argument of storage clients
 
@@ -71,6 +71,12 @@ The deprecated `latest_sdk_version`, `log_format`, and `standby_port` fields hav
 - In place of `standby_port`, use `web_server_port`.
 - `latest_sdk_version` and `log_format` don't have replacement. SDK version checking isn't supported for the Python SDK and the log format should be adjusted in code instead.
 
+### Unused `Configuration` fields
+
+The `disable_outdated_warning` and `fact` fields have been removed from `Configuration`. The SDK never read either of them, and `Actor.get_env()` no longer includes their keys. The corresponding `ApifyEnvVars.DISABLE_OUTDATED_WARNING` and `ApifyEnvVars.FACT` enum entries remain available.
+
+Neither has a replacement. SDK version checking isn't supported for the Python SDK, so there's no outdated-version warning to disable.
+
 ### wait_for_finish argument of Actor.start
 
 The `wait_for_finish` argument of `Actor.start()` has been removed. It contradicted the purpose of `Actor.start()`, which only starts the run without waiting for it to finish. The JS SDK does not expose it on `Actor.start()` either. To wait for a run to finish, use `Actor.call()`.
diff --git a/src/apify/_configuration.py b/src/apify/_configuration.py
index 9731696b..cdd801c9 100644
--- a/src/apify/_configuration.py
+++ b/src/apify/_configuration.py
@@ -264,17 +264,6 @@ class Configuration(CrawleeConfiguration):
         ),
     ] = None
 
-    disable_outdated_warning: Annotated[
-        bool,
-        Field(
-            validation_alias='apify_disable_outdated_warning',
-            description='Controls the display of outdated SDK version warnings',
-        ),
-        BeforeValidator(lambda val: val or False),
-    ] = False
-
-    fact: Annotated[str | None, Field(validation_alias='apify_fact')] = None
-
     input_key: Annotated[
         str,
         Field(
diff --git a/tests/unit/actor/test_actor_env_helpers.py b/tests/unit/actor/test_actor_env_helpers.py
index 8b67637e..0d5adfdb 100644
--- a/tests/unit/actor/test_actor_env_helpers.py
+++ b/tests/unit/actor/test_actor_env_helpers.py
@@ -31,7 +31,6 @@
 
 BOOL_ENV_VARS: list[ApifyEnvVars] = [
     ApifyEnvVars.DISABLE_BROWSER_SANDBOX,
-    ApifyEnvVars.DISABLE_OUTDATED_WARNING,
     ApifyEnvVars.HEADLESS,
     ApifyEnvVars.IS_AT_HOME,
     ApifyEnvVars.PERSIST_STORAGE,
@@ -62,7 +61,6 @@
     ApifyEnvVars.API_BASE_URL,
     ApifyEnvVars.API_PUBLIC_BASE_URL,
     ApifyEnvVars.DEFAULT_BROWSER_PATH,
-    ApifyEnvVars.FACT,
     ApifyEnvVars.INPUT_SECRETS_PRIVATE_KEY_FILE,
     ApifyEnvVars.INPUT_SECRETS_PRIVATE_KEY_PASSPHRASE,
     ApifyEnvVars.LOCAL_STORAGE_DIR,