diff --git a/setup.py b/setup.py
index b4f75cd..cc0b31d 100644
--- a/setup.py
+++ b/setup.py
@@ -72,7 +72,7 @@
 
     install_requires=[
         'base58~=1.0.0',
-        'PyNaCl~=1.1.0',
+        'PyNaCl~=1.2.1',
         'pyasn1~=0.4',
         'cryptography~=2.3.1',
     ],