diff --git a/shared/secrets_masker/src/airflow_shared/secrets_masker/secrets_masker.py b/shared/secrets_masker/src/airflow_shared/secrets_masker/secrets_masker.py
index 5b7ff4e1c81e4..bf3fd91ebd7e6 100644
--- a/shared/secrets_masker/src/airflow_shared/secrets_masker/secrets_masker.py
+++ b/shared/secrets_masker/src/airflow_shared/secrets_masker/secrets_masker.py
@@ -127,9 +127,7 @@ def merge(
     return _secrets_masker().merge(new_value, old_value, name, max_depth)
 
 
-_global_secrets_masker: SecretsMasker | None = None
-
-
+@cache
 def _secrets_masker() -> SecretsMasker:
     """
     Get or create the module-level secrets masker instance.
@@ -139,10 +137,7 @@ def _secrets_masker() -> SecretsMasker:
     airflow.sdk._shared) will have separate global variables and thus separate
     masker instances.
     """
-    global _global_secrets_masker
-    if _global_secrets_masker is None:
-        _global_secrets_masker = SecretsMasker()
-    return _global_secrets_masker
+    return SecretsMasker()
 
 
 def reset_secrets_masker() -> None:
diff --git a/shared/timezones/src/airflow_shared/timezones/timezone.py b/shared/timezones/src/airflow_shared/timezones/timezone.py
index 9621c3856a16e..4fe40ef1e5919 100644
--- a/shared/timezones/src/airflow_shared/timezones/timezone.py
+++ b/shared/timezones/src/airflow_shared/timezones/timezone.py
@@ -37,6 +37,12 @@
 utc = pendulum.UTC
 
 
+class _Timezone:
+    """Keep track of current timezone w/o global variable."""
+
+    initialized_timezone: FixedTimezone | Timezone = utc
+
+
 def is_localized(value: dt.datetime) -> bool:
     """
     Determine if a given datetime.datetime is aware.
@@ -87,7 +93,7 @@ def convert_to_utc(value: dt.datetime | None) -> DateTime | None:
         return value
 
     if not is_localized(value):
-        value = pendulum.instance(value, TIMEZONE)
+        value = pendulum.instance(value, _Timezone.initialized_timezone)
 
     return pendulum.instance(value.astimezone(utc))
 
@@ -113,7 +119,7 @@ def make_aware(value: dt.datetime | None, timezone: dt.tzinfo | None = None) ->
     :return: localized datetime in settings.TIMEZONE or timezone
     """
     if timezone is None:
-        timezone = TIMEZONE
+        timezone = _Timezone.initialized_timezone
 
     if not value:
         return None
@@ -146,7 +152,7 @@ def make_naive(value, timezone=None):
     :return: naive datetime
     """
     if timezone is None:
-        timezone = TIMEZONE
+        timezone = _Timezone.initialized_timezone
 
     # Emulate the behavior of astimezone() on Python < 3.6.
     if is_naive(value):
@@ -169,7 +175,7 @@ def datetime(*args, **kwargs):
     :return: datetime.datetime
     """
     if "tzinfo" not in kwargs:
-        kwargs["tzinfo"] = TIMEZONE
+        kwargs["tzinfo"] = _Timezone.initialized_timezone
 
     return dt.datetime(*args, **kwargs)
 
@@ -182,7 +188,7 @@ def parse(string: str, timezone=None, *, strict=False) -> DateTime:
     :param timezone: the timezone
     :param strict: if False, it will fall back on the dateutil parser if unable to parse with pendulum
     """
-    return pendulum.parse(string, tz=timezone or TIMEZONE, strict=strict)  # type: ignore
+    return pendulum.parse(string, tz=timezone or _Timezone.initialized_timezone, strict=strict)  # type: ignore
 
 
 @overload
@@ -279,20 +285,16 @@ def local_timezone() -> FixedTimezone | Timezone:
     return pendulum.tz.local_timezone()
 
 
-TIMEZONE: FixedTimezone | Timezone = utc
-
-
 def initialize(default_timezone: str) -> None:
     """
     Initialize the default timezone for the timezone library.
 
     Automatically called by airflow-core and task-sdk during their initialization.
     """
-    global TIMEZONE
     if default_timezone == "system":
-        TIMEZONE = local_timezone()
+        _Timezone.initialized_timezone = local_timezone()
     else:
-        TIMEZONE = parse_timezone(default_timezone)
+        _Timezone.initialized_timezone = parse_timezone(default_timezone)
 
 
 def from_timestamp(timestamp: int | float, tz: str | FixedTimezone | Timezone = utc) -> DateTime: