diff --git a/Tools/build/mypy.ini b/Tools/build/mypy.ini
index cf1dac7fde5..0e5d6e874a7 100644
--- a/Tools/build/mypy.ini
+++ b/Tools/build/mypy.ini
@@ -8,6 +8,6 @@ python_version = 3.10
 
 # ...And be strict:
 strict = True
-strict_concatenate = True
+extra_checks = True
 enable_error_code = ignore-without-code,redundant-expr,truthy-bool,possibly-undefined
 warn_unreachable = True
diff --git a/Tools/cases_generator/mypy.ini b/Tools/cases_generator/mypy.ini
index 8e5a31851c5..e54349bf54a 100644
--- a/Tools/cases_generator/mypy.ini
+++ b/Tools/cases_generator/mypy.ini
@@ -8,7 +8,7 @@ python_version = 3.10
 
 # ...And be strict:
 strict = True
-strict_concatenate = True
+extra_checks = True
 enable_error_code = ignore-without-code,redundant-expr,truthy-bool,possibly-undefined
 warn_unreachable = True
 allow_redefinition = True
diff --git a/Tools/clinic/mypy.ini b/Tools/clinic/mypy.ini
index b1fdad673c6..6520e05db0b 100644
--- a/Tools/clinic/mypy.ini
+++ b/Tools/clinic/mypy.ini
@@ -7,6 +7,6 @@ python_version = 3.10
 
 # and be strict!
 strict = True
-strict_concatenate = True
+extra_checks = True
 enable_error_code = ignore-without-code,redundant-expr,truthy-bool
 warn_unreachable = True