diff --git a/.github/workflows/lint.yaml b/.github/workflows/lint.yaml
index d960c6d8..fbb5d996 100644
--- a/.github/workflows/lint.yaml
+++ b/.github/workflows/lint.yaml
@@ -24,8 +24,8 @@ jobs:
     - uses: actions/checkout@v4
     - uses: codespell-project/actions-codespell@master
       with:
-        skip: '*.po'
-        ignore_words_list: ba,te,deltion,dedent,dedented
+        skip: '*.po',encoding_latin1.py
+        ignore_words_list: ba,te,deltion,dedent,dedented,assertIn
 
   mypy:
     runs-on: ubuntu-latest
diff --git a/bpython/_typing_compat.py b/bpython/_typing_compat.py
index 486aacaf..5d9a3607 100644
--- a/bpython/_typing_compat.py
+++ b/bpython/_typing_compat.py
@@ -24,4 +24,4 @@
     # introduced in Python 3.11
     from typing import Never
 except ImportError:
-    from typing import NoReturn as Never  # type: ignore
+    from typing_extensions import Never  # type: ignore
diff --git a/bpython/curtsiesfrontend/repl.py b/bpython/curtsiesfrontend/repl.py
index 302e67d4..69eb18c9 100644
--- a/bpython/curtsiesfrontend/repl.py
+++ b/bpython/curtsiesfrontend/repl.py
@@ -236,7 +236,8 @@ def close(self) -> None:
 
     @property
     def encoding(self) -> str:
-        return sys.__stdin__.encoding
+        # `encoding` is new in py39
+        return sys.__stdin__.encoding  # type: ignore
 
     # TODO write a read() method?
 
diff --git a/bpython/pager.py b/bpython/pager.py
index e145e0ed..65a3b223 100644
--- a/bpython/pager.py
+++ b/bpython/pager.py
@@ -55,7 +55,8 @@ def page(data: str, use_internal: bool = False) -> None:
         try:
             popen = subprocess.Popen(command, stdin=subprocess.PIPE)
             assert popen.stdin is not None
-            data_bytes = data.encode(sys.__stdout__.encoding, "replace")
+            # `encoding` is new in py39
+            data_bytes = data.encode(sys.__stdout__.encoding, "replace")  # type: ignore
             popen.stdin.write(data_bytes)
             popen.stdin.close()
         except OSError as e:
diff --git a/bpython/repl.py b/bpython/repl.py
index b048314d..c87d1965 100644
--- a/bpython/repl.py
+++ b/bpython/repl.py
@@ -152,7 +152,9 @@ def runsource(
         with self.timer:
             return super().runsource(source, filename, symbol)
 
-    def showsyntaxerror(self, filename: Optional[str] = None, source: Optional[str] = None) -> None:
+    def showsyntaxerror(
+        self, filename: Optional[str] = None, source: Optional[str] = None
+    ) -> None:
         """Override the regular handler, the code's copied and pasted from
         code.py, as per showtraceback, but with the syntaxerror callback called
         and the text in a pretty colour."""
diff --git a/bpython/test/test_preprocess.py b/bpython/test/test_preprocess.py
index e9309f1e..a72a64b6 100644
--- a/bpython/test/test_preprocess.py
+++ b/bpython/test/test_preprocess.py
@@ -4,6 +4,7 @@
 import unittest
 
 from code import compile_command as compiler
+from codeop import CommandCompiler
 from functools import partial
 
 from bpython.curtsiesfrontend.interpreter import code_finished_will_parse
@@ -11,7 +12,7 @@
 from bpython.test.fodder import original, processed
 
 
-preproc = partial(preprocess, compiler=compiler)
+preproc = partial(preprocess, compiler=CommandCompiler)
 
 
 def get_fodder_source(test_name):
diff --git a/setup.cfg b/setup.cfg
index 1fe4a6f9..9a4f0bcb 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -29,6 +29,7 @@ install_requires =
     pygments
     pyxdg
     requests
+    typing_extensions ; python_version < "3.11"
 
 [options.extras_require]
 clipboard = pyperclip