diff --git a/requirements.txt b/requirements.txt
index a187d5ac1..ef2a2b646 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,4 +4,4 @@ nose-cov==1.6
 chai==1.1.1
 sphinx==1.3.5
 simplejson==3.6.5
-backports.functools_lru_cache==1.2.1
+backports.functools_lru_cache>=1.2.1,<1.4
diff --git a/setup.py b/setup.py
index 933e122ad..df66ab6ba 100644
--- a/setup.py
+++ b/setup.py
@@ -41,7 +41,7 @@ def grep(attrname):
         'python-dateutil',
     ],
     extras_require={
-        ":python_version=='2.7'": ['backports.functools_lru_cache>=1.2.1'],
+        ":python_version<='2.7'": ['backports.functools_lru_cache>=1.2.1,<1.4'],
     },
     test_suite="tests",
     classifiers=[