diff --git a/stubs/humanfriendly/@tests/stubtest_allowlist.txt b/stubs/humanfriendly/@tests/stubtest_allowlist.txt
index a7ffb9bdc..207533a16 100644
--- a/stubs/humanfriendly/@tests/stubtest_allowlist.txt
+++ b/stubs/humanfriendly/@tests/stubtest_allowlist.txt
@@ -1,6 +1,3 @@
-humanfriendly.compat.StringIO.seek
-humanfriendly.compat.StringIO.truncate
-
 # Re-exports:
 humanfriendly.usage.import_module
 humanfriendly.compat.which
diff --git a/stubs/pika/@tests/stubtest_allowlist.txt b/stubs/pika/@tests/stubtest_allowlist.txt
index cd187018c..dd96c9e0e 100644
--- a/stubs/pika/@tests/stubtest_allowlist.txt
+++ b/stubs/pika/@tests/stubtest_allowlist.txt
@@ -1,7 +1,3 @@
-# Inherited from stdlib's io module.
-pika.compat.StringIO.seek
-pika.compat.StringIO.truncate
-
 # Stubtest doesn't understand that a property alias is also read-only.
 # https://github.com/python/mypy/issues/6700
 pika(\.adapters)?(\.blocking_connection)?\.BlockingConnection\.basic_nack
diff --git a/stubs/six/@tests/stubtest_allowlist.txt b/stubs/six/@tests/stubtest_allowlist.txt
index 2e0b1cdcf..b00e2bf52 100644
--- a/stubs/six/@tests/stubtest_allowlist.txt
+++ b/stubs/six/@tests/stubtest_allowlist.txt
@@ -1,8 +1,4 @@
 # Problems inherited from the standard library
-six.BytesIO.readlines
-six.BytesIO.seek
-six.StringIO.seek
-six.StringIO.truncate
 six.create_bound_method.__closure__
 six.create_bound_method.__code__
 six.create_bound_method.__defaults__