diff --git a/setup.py b/setup.py
index 116656cc..1e76c119 100644
--- a/setup.py
+++ b/setup.py
@@ -25,7 +25,8 @@ install_requires = [
     "lockfile>=0.9.1,<0.13",
     "pyserial>=3,<4,!=3.3",
     "requests>=2.4.0,<3",
-    "semantic_version>=2.5.0"
+    "semantic_version>=2.5.0",
+    "backports.functools-lru-cache"  # tmp for for arrow
 ]
 
 setup(