diff --git a/requirements.txt b/requirements.txt
index 5c068b2..14ef969 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -5,11 +5,11 @@
 #    pip-compile --no-annotate --output-file requirements.txt requirements.in
 #
 appdirs==1.4.3
-asn1crypto==0.22.0
+asn1crypto==0.23.0
 attrs==17.2.0
 automat==0.6.0
 axiom==0.7.5
-cffi==1.10.0; platform_python_implementation != 'PyPy'
+cffi==1.11.0; platform_python_implementation != 'PyPy'
 constantly==15.1.0
 cryptography==2.0.3
 cssutils==1.0.2
@@ -19,22 +19,22 @@ hyperlink==17.3.1
 idna==2.6
 incremental==17.5.0
 ipaddress==1.0.18
-lxml==3.8.0
+lxml==4.0.0
 mantissa==0.9.0
 nevow==0.14.3
 olefile==0.44
 pillow==4.2.1
-pyasn1-modules==0.1.1
-pyasn1==0.3.3
+pyasn1-modules==0.1.4
+pyasn1==0.3.6
 pycparser==2.18; platform_python_implementation != 'PyPy'
-pyopenssl==17.2.0
+pyopenssl==17.3.0
 pyrsistent==0.13.0
 python-dateutil==2.6.1
 pytz==2017.2
 service-identity==17.0.0
-six==1.10.0
-twisted[conch,tls]==17.5.0
+six==1.11.0
+twisted[conch,tls]==17.9.0
 txaws==0.4.0
 venusian==1.1.0
 vertex==0.3.1
-zope.interface==4.4.2
+zope.interface==4.4.3