diff --git a/requirements.txt b/requirements.txt
index dd2b978..0901ddc 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,7 +6,7 @@
 #
 appdirs==1.4.3
 asn1crypto==0.24.0
-attrs==18.1.0
+attrs==18.2.0
 automat==0.7.0
 axiom==0.7.5
 cffi==1.11.5; platform_python_implementation != 'PyPy'
@@ -18,23 +18,23 @@ epsilon==0.7.3
 hyperlink==18.0.0
 idna==2.7
 incremental==17.5.0
-ipaddress==1.0.21
-lxml==4.2.4
+ipaddress==1.0.22
+lxml==4.2.5
 mantissa==0.9.0
 nevow==0.14.4
-olefile==0.45.1
-pillow==5.2.0
+olefile==0.46
+pillow==5.3.0
 pyasn1-modules==0.2.2
 pyasn1==0.4.4
-pycparser==2.18; platform_python_implementation != 'PyPy'
+pycparser==2.19; platform_python_implementation != 'PyPy'
 pyopenssl==18.0.0
-pyrsistent==0.14.4
-python-dateutil==2.7.3
-pytz==2018.5
+pyrsistent==0.14.5
+python-dateutil==2.7.5
+pytz==2018.7
 service-identity==17.0.0
 six==1.11.0
-twisted[tls,conch]==18.7.0
+twisted[tls,conch]==18.9.0
 txaws==0.5.0
 venusian==1.1.0
 vertex==0.3.1
-zope.interface==4.5.0
+zope.interface==4.6.0