diff --git a/Lib/test/libregrtest/main.py b/Lib/test/libregrtest/main.py
index 70f723a92eb44a..3c9d9620053355 100644
--- a/Lib/test/libregrtest/main.py
+++ b/Lib/test/libregrtest/main.py
@@ -349,9 +349,7 @@ def run_test(
             namespace = dict(locals())
             tracer.runctx(cmd, globals=globals(), locals=namespace)
             result = namespace['result']
-            # Mypy doesn't know about this attribute yet,
-            # but it will do soon: https://github.com/python/typeshed/pull/11091
-            result.covered_lines = list(tracer.counts)  # type: ignore[attr-defined]
+            result.covered_lines = list(tracer.counts)
         else:
             result = run_single_test(test_name, runtests)
 
diff --git a/Tools/requirements-dev.txt b/Tools/requirements-dev.txt
index 6944b15f7786fb..c5df4a61c78239 100644
--- a/Tools/requirements-dev.txt
+++ b/Tools/requirements-dev.txt
@@ -1,6 +1,6 @@
 # Requirements file for external linters and checks we run on
 # Tools/clinic, Tools/cases_generator/, and Tools/peg_generator/ in CI
-mypy==1.8.0
+mypy==1.9.0
 
 # needed for peg_generator:
 types-psutil==5.9.5.20240205