diff --git a/requirements.txt b/requirements.txt
index 369bc90..e9a6033 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -14,5 +14,5 @@ pep8==1.5.7
 pyflakes==0.8.1
 requests==2.5.0
 six==1.8.0
-ujson==1.33
+ujson==5.4.0
 wheel==0.24.0
diff --git a/setup.py b/setup.py
old mode 100755
new mode 100644
index 72f6a39..2d6f585
--- a/setup.py
+++ b/setup.py
@@ -12,7 +12,7 @@
 history = open('HISTORY.rst').read().replace('.. :changelog:', '')
 
 requirements = [
-    'requests==2.5.0', 'six==1.8.0', 'ujson==1.33'
+    'requests==2.5.0', 'six==1.8.0', 'ujson==5.4.0'
 ]
 
 setup(