diff --git a/pysnmp/entity/engine.py b/pysnmp/entity/engine.py
index 535eeff7d..b1547e536 100644
--- a/pysnmp/entity/engine.py
+++ b/pysnmp/entity/engine.py
@@ -58,7 +58,7 @@ class SnmpEngine:
 
     """
 
-    transportDispatcher: AbstractTransportDispatcher | None
+    transportDispatcher: "AbstractTransportDispatcher | None"
 
     def __init__(
         self, snmpEngineID=None, maxMessageSize: int = 65507, msgAndPduDsp=None
@@ -215,7 +215,9 @@ def getMibBuilder(self):
     def setUserContext(self, **kwargs):
         self.cache.update({"__%s" % k: kwargs[k] for k in kwargs})
 
-    def getUserContext(self, arg) -> Dict[str, Any] | None:  # TODO: fix this type check
+    def getUserContext(
+        self, arg
+    ) -> "Dict[str, Any] | None":  # TODO: fix this type check
         return self.cache.get("__%s" % arg)
 
     def delUserContext(self, arg):
diff --git a/pysnmp/entity/rfc3413/config.py b/pysnmp/entity/rfc3413/config.py
index 778192b7e..45cc3f1d0 100644
--- a/pysnmp/entity/rfc3413/config.py
+++ b/pysnmp/entity/rfc3413/config.py
@@ -20,7 +20,7 @@ def getTargetAddr(snmpEngine: SnmpEngine, snmpTargetAddrName):
 
     cache = snmpEngine.getUserContext("getTargetAddr")
     if cache is None:
-        cache: Dict[str, Any] | None = {"id": -1}
+        cache: "Dict[str, Any] | None" = {"id": -1}
         snmpEngine.setUserContext(getTargetAddr=cache)
 
     if cache["id"] != snmpTargetAddrEntry.branchVersionId:
@@ -119,7 +119,7 @@ def getTargetParams(snmpEngine: SnmpEngine, paramsName):
 
     cache = snmpEngine.getUserContext("getTargetParams")
     if cache is None:
-        cache: Dict[str, Any] | None = {"id": -1}
+        cache: "Dict[str, Any] | None" = {"id": -1}
         snmpEngine.setUserContext(getTargetParams=cache)
 
     if cache["id"] != snmpTargetParamsEntry.branchVersionId:
@@ -209,7 +209,7 @@ def getNotificationInfo(snmpEngine: SnmpEngine, notificationTarget):
 
     cache = snmpEngine.getUserContext("getNotificationInfo")
     if cache is None:
-        cache: Dict[str, Any] | None = {"id": -1}
+        cache: "Dict[str, Any] | None" = {"id": -1}
         snmpEngine.setUserContext(getNotificationInfo=cache)
 
     if cache["id"] != snmpNotifyEntry.branchVersionId:
@@ -247,7 +247,7 @@ def getTargetNames(snmpEngine: SnmpEngine, tag):
 
     cache = snmpEngine.getUserContext("getTargetNames")
     if cache is None:
-        cache: Dict[str, Any] | None = {"id": -1}
+        cache: "Dict[str, Any] | None" = {"id": -1}
         snmpEngine.setUserContext(getTargetNames=cache)
 
     if cache["id"] == snmpTargetAddrEntry.branchVersionId:
diff --git a/pysnmp/hlapi/asyncio/cmdgen.py b/pysnmp/hlapi/asyncio/cmdgen.py
index 962a4ae7a..973bc2278 100644
--- a/pysnmp/hlapi/asyncio/cmdgen.py
+++ b/pysnmp/hlapi/asyncio/cmdgen.py
@@ -57,7 +57,7 @@
 
 async def getCmd(
     snmpEngine: SnmpEngine,
-    authData: CommunityData | UsmUserData,
+    authData: "CommunityData | UsmUserData",
     transportTarget: AbstractTransportTarget,
     contextData: ContextData,
     *varBinds,
@@ -177,7 +177,7 @@ def __cbFun(
 
 async def setCmd(
     snmpEngine: SnmpEngine,
-    authData: CommunityData | UsmUserData,
+    authData: "CommunityData | UsmUserData",
     transportTarget: AbstractTransportTarget,
     contextData: ContextData,
     *varBinds,
@@ -297,7 +297,7 @@ def __cbFun(
 
 async def nextCmd(
     snmpEngine: SnmpEngine,
-    authData: CommunityData | UsmUserData,
+    authData: "CommunityData | UsmUserData",
     transportTarget: AbstractTransportTarget,
     contextData: ContextData,
     *varBinds,
@@ -395,8 +395,11 @@ def __cbFun(
         lookupMib, future = cbCtx
         if future.cancelled():
             return
-        if (options.get('ignoreNonIncreasingOid', False) and
-                errorIndication and isinstance(errorIndication, errind.OidNotIncreasing)):
+        if (
+            options.get("ignoreNonIncreasingOid", False)
+            and errorIndication
+            and isinstance(errorIndication, errind.OidNotIncreasing)
+        ):
             errorIndication = None
         try:
             varBindsUnmade = [
@@ -431,7 +434,7 @@ def __cbFun(
 
 async def bulkCmd(
     snmpEngine: SnmpEngine,
-    authData: CommunityData | UsmUserData,
+    authData: "CommunityData | UsmUserData",
     transportTarget: AbstractTransportTarget,
     contextData: ContextData,
     nonRepeaters: int,
@@ -560,8 +563,11 @@ def __cbFun(
         lookupMib, future = cbCtx
         if future.cancelled():
             return
-        if (options.get('ignoreNonIncreasingOid', False) and
-                errorIndication and isinstance(errorIndication, errind.OidNotIncreasing)):
+        if (
+            options.get("ignoreNonIncreasingOid", False)
+            and errorIndication
+            and isinstance(errorIndication, errind.OidNotIncreasing)
+        ):
             errorIndication = None
         try:
             varBindsUnmade = [
diff --git a/pysnmp/hlapi/asyncio/transport.py b/pysnmp/hlapi/asyncio/transport.py
index 116fdd4e8..5ed5c647f 100644
--- a/pysnmp/hlapi/asyncio/transport.py
+++ b/pysnmp/hlapi/asyncio/transport.py
@@ -53,7 +53,7 @@ class instance.
     transportDomain: Tuple[int, ...] = udp.domainName
     protoTransport = udp.UdpAsyncioTransport
 
-    def _resolveAddr(self, transportAddr: tuple) -> tuple[str, int]:
+    def _resolveAddr(self, transportAddr: Tuple) -> Tuple[str, int]:
         try:
             return socket.getaddrinfo(
                 transportAddr[0],
diff --git a/pysnmp/hlapi/transport.py b/pysnmp/hlapi/transport.py
index b9fd34db1..a8b18d0e9 100644
--- a/pysnmp/hlapi/transport.py
+++ b/pysnmp/hlapi/transport.py
@@ -4,6 +4,7 @@
 # Copyright (c) 2005-2019, Ilya Etingof <etingof@gmail.com>
 # License: https://www.pysnmp.com/pysnmp/license.html
 #
+from typing import Tuple
 from pyasn1.compat.octets import null
 from pysnmp.carrier.base import AbstractTransport, AbstractTransportAddress
 from pysnmp import error
@@ -16,15 +17,15 @@ class AbstractTransportTarget:
 
     retries: int
     timeout: float
-    transport: AbstractTransport | None
-    transportAddr: tuple[str, int]
+    transport: "AbstractTransport | None"
+    transportAddr: Tuple[str, int]
 
     transportDomain = None
     protoTransport = AbstractTransport
 
     def __init__(
         self,
-        transportAddr: tuple,
+        transportAddr: Tuple,
         timeout: float = 1,
         retries: int = 5,
         tagList=null,
@@ -79,5 +80,5 @@ def verifyDispatcherCompatibility(self, snmpEngine: SnmpEngine):
                 )
             )
 
-    def _resolveAddr(self, transportAddr: tuple) -> tuple[str, int]:
+    def _resolveAddr(self, transportAddr: Tuple) -> Tuple[str, int]:
         raise NotImplementedError()