diff --git a/requirements.txt b/requirements.txt
index 18cf38b..6007260 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,7 +11,7 @@ cffi==1.5.0; platform_python_implementation != 'PyPy'
 characteristic==14.3.0
 cryptography==1.3.1         # via pyopenssl
 eliot==0.11.0
-enum34==1.1.2             # via cryptography, hypothesis
+enum34==1.1.3             # via cryptography, hypothesis
 Epsilon==0.7.1
 extras==0.0.3             # via testtools
 fixtures==2.0.0           # via testtools