diff --git a/requirements.txt b/requirements.txt
index 2229a3a..959ed09 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,7 +5,7 @@
 #    pip-compile --no-annotate --output-file requirements.txt requirements.in
 #
 argparse==1.4.0
-asn1crypto==0.22.0
+asn1crypto==0.23.0
 attrs==17.2.0
 automat==0.6.0
 axiom==0.7.5
@@ -19,24 +19,24 @@ extras==1.0.0
 fixtures==3.0.0
 fusion-util==1.2.0
 hyperlink==17.3.1
-hypothesis==3.23.2
+hypothesis==3.31.2
 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==0.1.1
-pyasn1==0.3.3
-pyopenssl==17.2.0
+pyasn1-modules==0.1.4
+pyasn1==0.3.6
+pyopenssl==17.3.0
 pyrsistent==0.13.0
 python-mimeparse==1.6.0
 service-identity==17.0.0
-six==1.10.0
+six==1.11.0
 testtools==2.3.0
 toolz==0.8.2
 traceback2==1.4.0
-twisted[tls]==17.5.0
+twisted[tls]==17.9.0
 txspinneret==0.1.3
 unittest2==1.1.0
-zope.interface==4.4.2
+zope.interface==4.4.3