diff --git a/requirements.txt b/requirements.txt
index 28fdaf9..9fdf965 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,42 +6,42 @@
 #
 argparse==1.4.0
 asn1crypto==0.24.0
-attrs==18.1.0
+attrs==19.1.0
 automat==0.7.0
 axiom==0.7.5
-cffi==1.11.5
+cffi==1.12.3
 characteristic==14.3.0
 constantly==15.1.0
-coverage==4.5.1
-cryptography==2.3.1
-eliot==1.5.0
+coverage==4.5.3
+cryptography==2.7
+eliot==1.10.0
 enum34==1.1.6
 epsilon==0.7.3
 extras==1.0.0
 fixtures==3.0.0
 fusion-util==1.3.0
-hyperlink==18.0.0
-hypothesis==3.69.0
-idna==2.7
+hyperlink==19.0.0
+hypothesis==4.32.1
+idna==2.8
 incremental==17.5.0
 ipaddress==1.0.22
 linecache2==1.0.0
-pbr==4.2.0
-prometheus-client==0.3.1
+pbr==5.4.1
+prometheus-client==0.7.1
 py2casefold==1.0.1
-pyasn1-modules==0.2.2
-pyasn1==0.4.4
-pycparser==2.18
+pyasn1-modules==0.2.5
+pyasn1==0.4.5
+pycparser==2.19
 pyhamcrest==1.9.0
-pyopenssl==18.0.0
-pyrsistent==0.14.4
+pyopenssl==19.0.0
+pyrsistent==0.15.4
 python-mimeparse==1.6.0
-service-identity==17.0.0
-six==1.11.0
+service-identity==18.1.0
+six==1.12.0
 testtools==2.3.0
-toolz==0.9.0
+toolz==0.10.0
 traceback2==1.4.0
-twisted[tls]==18.7.0
+twisted[tls]==19.2.1
 txspinneret==0.1.3
 unittest2==1.1.0
-zope.interface==4.5.0
+zope.interface==4.6.0