diff --git a/stdlib/_hashlib.pyi b/stdlib/_hashlib.pyi
index e9e5ec8a2f8a..5c1a75eaa7fc 100644
--- a/stdlib/_hashlib.pyi
+++ b/stdlib/_hashlib.pyi
@@ -59,7 +59,7 @@ def compare_digest(a: ReadableBuffer, b: ReadableBuffer, /) -> bool: ...
 @overload
 def compare_digest(a: AnyStr, b: AnyStr, /) -> bool: ...
 def get_fips_mode() -> int: ...
-def hmac_new(key: bytes | bytearray, msg: ReadableBuffer = b"", digestmod: _DigestMod = None) -> HMAC: ...
+def hmac_new(key: ReadableBuffer, msg: ReadableBuffer = b"", digestmod: _DigestMod = None) -> HMAC: ...
 
 if sys.version_info >= (3, 13):
     def new(
@@ -117,7 +117,7 @@ else:
     def openssl_shake_128(string: ReadableBuffer = b"", *, usedforsecurity: bool = True) -> HASHXOF: ...
     def openssl_shake_256(string: ReadableBuffer = b"", *, usedforsecurity: bool = True) -> HASHXOF: ...
 
-def hmac_digest(key: bytes | bytearray, msg: ReadableBuffer, digest: str) -> bytes: ...
+def hmac_digest(key: ReadableBuffer, msg: ReadableBuffer, digest: str) -> bytes: ...
 def pbkdf2_hmac(
     hash_name: str, password: ReadableBuffer, salt: ReadableBuffer, iterations: int, dklen: int | None = None
 ) -> bytes: ...
diff --git a/stdlib/_zstd.pyi b/stdlib/_zstd.pyi
index b4e3d7aaaa09..34b619f9b0b6 100644
--- a/stdlib/_zstd.pyi
+++ b/stdlib/_zstd.pyi
@@ -74,7 +74,7 @@ class ZstdDecompressor:
 
 @final
 class ZstdDict:
-    def __new__(cls, dict_content: bytes, /, *, is_raw: bool = False) -> Self: ...
+    def __new__(cls, dict_content: ReadableBuffer, /, *, is_raw: bool = False) -> Self: ...
     def __len__(self, /) -> int: ...
     @property
     def as_digested_dict(self) -> tuple[Self, int]: ...
diff --git a/stdlib/binascii.pyi b/stdlib/binascii.pyi
index 692c3e4f07bd..6840c6883811 100644
--- a/stdlib/binascii.pyi
+++ b/stdlib/binascii.pyi
@@ -26,7 +26,7 @@ if sys.version_info >= (3, 15):
         /,
         *,
         strict_mode: bool = False,
-        alphabet: ReadableBuffer = ...,
+        alphabet: bytes = ...,
         padded: bool = True,
         ignorechars: ReadableBuffer = ...,
         canonical: bool = False,
@@ -41,7 +41,7 @@ if sys.version_info >= (3, 15):
         data: _AsciiBuffer,
         /,
         *,
-        alphabet: ReadableBuffer = ...,
+        alphabet: bytes = ...,
         padded: bool = True,
         ignorechars: ReadableBuffer = b"",
         canonical: bool = False,
@@ -60,7 +60,7 @@ if sys.version_info >= (3, 15):
     ) -> bytes: ...
     def b2a_base85(data: ReadableBuffer, /, *, alphabet: ReadableBuffer = ..., pad: bool = False, wrapcol: int = 0) -> bytes: ...
     def a2b_base85(
-        data: _AsciiBuffer, /, *, alphabet: ReadableBuffer = ..., ignorechars: ReadableBuffer = b"", canonical: bool = False
+        data: _AsciiBuffer, /, *, alphabet: bytes = ..., ignorechars: ReadableBuffer = b"", canonical: bool = False
     ) -> bytes: ...
 
 elif sys.version_info >= (3, 11):
diff --git a/stdlib/ssl.pyi b/stdlib/ssl.pyi
index 833c411fab21..6a8456d1498e 100644
--- a/stdlib/ssl.pyi
+++ b/stdlib/ssl.pyi
@@ -286,7 +286,7 @@ class SSLSocket(socket.socket):
     def sendto(self, data: ReadableBuffer, flags_or_addr: int, addr: socket._Address) -> int: ...
     def shutdown(self, how: int) -> None: ...
     @deprecated("Deprecated since Python 3.6. Use `SSLSocket.recv` method instead.")
-    def read(self, len: int = 1024, buffer: bytearray | None = None) -> bytes: ...
+    def read(self, len: int = 1024, buffer: WriteableBuffer | None = None) -> bytes: ...
     @deprecated("Deprecated since Python 3.6. Use `SSLSocket.send` method instead.")
     def write(self, data: ReadableBuffer) -> int: ...
     def do_handshake(self, block: bool = False) -> None: ...  # block is undocumented
@@ -443,7 +443,7 @@ class SSLObject:
     @property
     def session_reused(self) -> bool: ...
     def __init__(self, *args: Any, **kwargs: Any) -> None: ...
-    def read(self, len: int = 1024, buffer: bytearray | None = None) -> bytes: ...
+    def read(self, len: int = 1024, buffer: WriteableBuffer | None = None) -> bytes: ...
     def write(self, data: ReadableBuffer) -> int: ...
     @overload
     def getpeercert(self, binary_form: Literal[False] = False) -> _PeerCertRetDictType | None: ...