diff --git a/requirements.txt b/requirements.txt
index 2d35495..45342a8 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,7 +11,7 @@ automat==0.7.0
 axiom==0.7.5
 cffi==1.11.5; platform_python_implementation != 'PyPy'
 constantly==15.1.0
-cryptography==2.2.2
+cryptography==2.3
 cssutils==1.0.2
 enum34==1.1.6
 epsilon==0.7.3
@@ -33,7 +33,7 @@ python-dateutil==2.7.3
 pytz==2018.5
 service-identity==17.0.0
 six==1.11.0
-twisted[tls,conch]==18.4.0
+twisted[tls,conch]==18.7.0
 txaws==0.5.0
 venusian==1.1.0
 vertex==0.3.1