diff --git a/misc/dump-ast.py b/misc/dump-ast.py
index bf59a9a01236..1251f44c2288 100755
--- a/misc/dump-ast.py
+++ b/misc/dump-ast.py
@@ -28,15 +28,11 @@ def main() -> None:
     parser = argparse.ArgumentParser(
         description="Parse source files and print the abstract syntax tree (AST)."
     )
-    parser.add_argument("--py2", action="store_true", help="parse FILEs as Python 2")
     parser.add_argument("--quiet", action="store_true", help="do not print AST")
     parser.add_argument("FILE", nargs="*", help="files to parse")
     args = parser.parse_args()
 
-    if args.py2:
-        pyversion = defaults.PYTHON2_VERSION
-    else:
-        pyversion = defaults.PYTHON3_VERSION
+    pyversion = defaults.PYTHON3_VERSION
 
     status = 0
     for fname in args.FILE:
diff --git a/mypy/defaults.py b/mypy/defaults.py
index cd689bf3f9c1..10b15566e68e 100644
--- a/mypy/defaults.py
+++ b/mypy/defaults.py
@@ -2,8 +2,6 @@
 
 from typing_extensions import Final
 
-PYTHON2_VERSION: Final = (2, 7)
-
 # Earliest fully supported Python 3.x version. Used as the default Python
 # version in tests. Mypy wheels should be built starting with this version,
 # and CI tests should be run on this version (and later versions).
diff --git a/mypy/main.py b/mypy/main.py
index 85a1eb0765eb..c98fe0ad9736 100644
--- a/mypy/main.py
+++ b/mypy/main.py
@@ -594,14 +594,6 @@ def add_invertible_flag(
         help="Type check code assuming it will be running on Python x.y",
         dest="special-opts:python_version",
     )
-    platform_group.add_argument(
-        "-2",
-        "--py2",
-        dest="special-opts:python_version",
-        action="store_const",
-        const=defaults.PYTHON2_VERSION,
-        help="Use Python 2 mode (same as --python-version 2.7)",
-    )
     platform_group.add_argument(
         "--platform",
         action="store",
diff --git a/mypy/test/helpers.py b/mypy/test/helpers.py
index a77cc38c7cb8..cbd623fc9acd 100644
--- a/mypy/test/helpers.py
+++ b/mypy/test/helpers.py
@@ -284,14 +284,6 @@ def testfile_pyversion(path: str) -> Tuple[int, int]:
         return defaults.PYTHON3_VERSION
 
 
-def testcase_pyversion(path: str, testcase_name: str) -> Tuple[int, int]:
-    if testcase_name.endswith("python2"):
-        raise ValueError(testcase_name)
-        return defaults.PYTHON2_VERSION
-    else:
-        return testfile_pyversion(path)
-
-
 def normalize_error_messages(messages: List[str]) -> List[str]:
     """Translate an array of error messages to use / as path separator."""
 
@@ -383,8 +375,8 @@ def parse_options(
         options.error_summary = False
 
     # Allow custom python version to override testcase_pyversion.
-    if all(flag.split("=")[0] not in ["--python-version", "-2", "--py2"] for flag in flag_list):
-        options.python_version = testcase_pyversion(testcase.file, testcase.name)
+    if all(flag.split("=")[0] != "--python-version" for flag in flag_list):
+        options.python_version = testfile_pyversion(testcase.file)
 
     if testcase.config.getoption("--mypy-verbose"):
         options.verbosity = testcase.config.getoption("--mypy-verbose")