diff --git a/diskcache/core.py b/diskcache/core.py
index fb343be..0007eed 100644
--- a/diskcache/core.py
+++ b/diskcache/core.py
@@ -9,7 +9,7 @@
 import json
 import os
 import os.path as op
-import pickle
+import dill as pickle
 import pickletools
 import sqlite3
 import struct
diff --git a/requirements.txt b/requirements.txt
index efb2160..8e14a87 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1,6 +1,7 @@
 -e .
 blue
 coverage
+dill
 django==3.2.*
 django_redis
 doc8
diff --git a/setup.py b/setup.py
index b49d9c8..58c7b26 100644
--- a/setup.py
+++ b/setup.py
@@ -41,7 +41,9 @@ def run_tests(self):
     tests_require=['tox'],
     cmdclass={'test': Tox},
     python_requires='>=3',
-    install_requires=[],
+    install_requires=[
+        'dill'
+    ],
     classifiers=(
         'Development Status :: 5 - Production/Stable',
         'Intended Audience :: Developers',