diff --git a/requirements.txt b/requirements.txt
index 959ed09..0a27f33 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -11,7 +11,7 @@ automat==0.6.0
 axiom==0.7.5
 characteristic==14.3.0
 constantly==15.1.0
-cryptography==2.0.3
+cryptography==2.1.1
 eliot==1.1.0
 enum34==1.1.6
 epsilon==0.7.1
@@ -19,17 +19,17 @@ extras==1.0.0
 fixtures==3.0.0
 fusion-util==1.2.0
 hyperlink==17.3.1
-hypothesis==3.31.2
+hypothesis==3.33.0
 idna==2.6
 incremental==17.5.0
 ipaddress==1.0.18
 linecache2==1.0.0
 pbr==3.1.1
 py2casefold==0.2.1
-pyasn1-modules==0.1.4
-pyasn1==0.3.6
+pyasn1-modules==0.1.5
+pyasn1==0.3.7
 pyopenssl==17.3.0
-pyrsistent==0.13.0
+pyrsistent==0.14.0
 python-mimeparse==1.6.0
 service-identity==17.0.0
 six==1.11.0