diff --git a/tests/test_mypy.yml b/tests/test_mypy.yml
index f65e58efd..70a89670f 100644
--- a/tests/test_mypy.yml
+++ b/tests/test_mypy.yml
@@ -766,6 +766,7 @@
             return 'hello'
 
 - case: testAttrsUsingBadConverter
+  regex: true
   main: |
     import attr
     from typing import overload
@@ -785,13 +786,14 @@
         bad_overloaded: int = attr.ib(converter=bad_overloaded_converter)
     reveal_type(A)
   out: |
-    main:15: error: Cannot determine __init__ type from converter  [misc]
-    main:15: error: Argument "converter" has incompatible type "Callable[[], str]"; expected "Callable[[Any], Any] | None"  [arg-type]
-    main:16: error: Cannot determine __init__ type from converter  [misc]
-    main:16: error: Argument "converter" has incompatible type overloaded function; expected "Callable[[Any], Any] | None"  [arg-type]
-    main:17: note: Revealed type is "def (bad: Any, bad_overloaded: Any) -> main.A"
+    main:15: error: Cannot determine __init__ type from converter  \[misc\]
+    main:15: error: Argument "converter" has incompatible type \"Callable\[\[\], str\]\"; expected (\"Callable\[\[Any\], Any\] \| None\"|\"Optional\[Callable\[\[Any\], Any\]\]\")  \[arg-type\]
+    main:16: error: Cannot determine __init__ type from converter  \[misc\]
+    main:16: error: Argument "converter" has incompatible type overloaded function; expected (\"Callable\[\[Any\], Any\] \| None\"|\"Optional\[Callable\[\[Any\], Any\]\]\")  \[arg-type\]
+    main:17: note: Revealed type is "def (bad: Any, bad_overloaded: Any\) -> main.A"
 
 - case: testAttrsUsingBadConverterReprocess
+  regex: true
   main: |
     import attr
     from typing import overload
@@ -812,11 +814,11 @@
         bad_overloaded: int = attr.ib(converter=bad_overloaded_converter)
     reveal_type(A)
   out: |
-    main:16: error: Cannot determine __init__ type from converter  [misc]
-    main:16: error: Argument "converter" has incompatible type "Callable[[], str]"; expected "Callable[[Any], Any] | None"  [arg-type]
-    main:17: error: Cannot determine __init__ type from converter  [misc]
-    main:17: error: Argument "converter" has incompatible type overloaded function; expected "Callable[[Any], Any] | None"  [arg-type]
-    main:18: note: Revealed type is "def (bad: Any, bad_overloaded: Any) -> main.A"
+    main:16: error: Cannot determine __init__ type from converter  \[misc\]
+    main:16: error: Argument \"converter\" has incompatible type \"Callable\[\[\], str\]\"; expected (\"Callable\[\[Any\], Any\] \| None\"|\"Optional\[Callable\[\[Any\], Any\]\]\")  \[arg-type\]
+    main:17: error: Cannot determine __init__ type from converter  \[misc\]
+    main:17: error: Argument "converter" has incompatible type overloaded function; expected (\"Callable\[\[Any\], Any\] \| None\"|\"Optional\[Callable\[\[Any\], Any\]\]\")  \[arg-type\]
+    main:18: note: Revealed type is "def (bad: Any, bad_overloaded: Any\) -> main.A"
 
 - case: testAttrsUsingUnsupportedConverter
   main: |
diff --git a/tox.ini b/tox.ini
index 9c4c1983f..ef24c03ad 100644
--- a/tox.ini
+++ b/tox.ini
@@ -23,14 +23,11 @@ pass_env =
     NO_COLOR
 extras =
     tests: tests
-deps =
-    mypy: attrs[tests-mypy]
+    mypy: tests-mypy
 commands =
     tests: pytest {posargs:-n auto}
     mypy: mypy tests/typing_example.py
     mypy: mypy src/attrs/__init__.pyi src/attr/__init__.pyi src/attr/_typing_compat.pyi src/attr/_version_info.pyi src/attr/converters.pyi src/attr/exceptions.pyi src/attr/filters.pyi src/attr/setters.pyi src/attr/validators.pyi
-allowlist_externals =
-    mypy
 
 [testenv:py3{7,10,11}-tests]
 extras = cov