diff --git a/django/utils/version.py b/django/utils/version.py
index 1e9c720299..ecd41dac89 100644
--- a/django/utils/version.py
+++ b/django/utils/version.py
@@ -6,6 +6,9 @@ import sys
 
 from django.utils.regex_helper import _lazy_re_compile
 
+# Private, stable API for detecting the Python implementation.
+PYPY = sys.implementation.name == "pypy"
+
 # Private, stable API for detecting the Python version. PYXY means "Python X.Y
 # or later". So that third-party apps can use these values, each constant
 # should remain as long as the oldest supported Django version supports that
diff --git a/tests/dispatch/tests.py b/tests/dispatch/tests.py
index 2cd7bc8094..8e72e626dd 100644
--- a/tests/dispatch/tests.py
+++ b/tests/dispatch/tests.py
@@ -1,13 +1,13 @@
 import gc
-import sys
 import weakref
 from types import TracebackType
 
 from django.dispatch import Signal, receiver
 from django.test import SimpleTestCase
 from django.test.utils import override_settings
+from django.utils.version import PYPY
 
-if hasattr(sys, "pypy_version_info"):
+if PYPY:
 
     def garbage_collect():
         # Collecting weakreferences can take two collections on PyPy.
diff --git a/tests/runtests.py b/tests/runtests.py
index 48beb1a3d7..1e3d15591f 100755
--- a/tests/runtests.py
+++ b/tests/runtests.py
@@ -30,7 +30,7 @@ else:
     from django.test.utils import NullTimeKeeper, TimeKeeper, get_runner
     from django.utils.deprecation import RemovedInDjango60Warning
     from django.utils.log import DEFAULT_LOGGING
-    from django.utils.version import PY312
+    from django.utils.version import PY312, PYPY
 
 try:
     import MySQLdb
@@ -52,7 +52,7 @@ warnings.simplefilter("error", RuntimeWarning)
 # references, which are a minority, so the garbage collection threshold can be
 # larger than the default threshold of 700 allocations + deallocations without
 # much increase in memory usage.
-if not hasattr(sys, "pypy_version_info"):
+if not PYPY:
     gc.set_threshold(100_000)
 
 RUNTESTS_DIR = os.path.abspath(os.path.dirname(__file__))