diff --git a/setup.py b/setup.py
index 47040e66..71e0e850 100644
--- a/setup.py
+++ b/setup.py
@@ -9,6 +9,7 @@
     "pyyaml",
     "python-dateutil",
     "requests",
+    "requests-cache",
     "requests_toolbelt",
     "tqdm",
     "stevedore>1.20.0",
diff --git a/tox.ini b/tox.ini
index b4542cc2..44cb08e6 100644
--- a/tox.ini
+++ b/tox.ini
@@ -4,8 +4,6 @@ envlist = py39-cov-xdist
 [testenv]
 deps =
      xdist: pytest-xdist[psutil]
-     # ??? needs to be added as a dep of e3-core
-     requests-cache
      ptyprocess;platform_system == "Linux"
      cov: pytest-cov
      cov: coverage