diff --git a/requirements.txt b/requirements.txt
index 0267b5d..b84e740 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -6,7 +6,7 @@
 #
 argparse==1.4.0
 asn1crypto==0.24.0
-attrs==17.4.0
+attrs==18.1.0
 automat==0.6.0
 axiom==0.7.5
 characteristic==14.3.0
@@ -19,12 +19,12 @@ extras==1.0.0
 fixtures==3.0.0
 fusion-util==1.3.0
 hyperlink==18.0.0
-hypothesis==3.53.0
+hypothesis==3.56.5
 idna==2.6
 incremental==17.5.0
-ipaddress==1.0.19
+ipaddress==1.0.21
 linecache2==1.0.0
-pbr==4.0.0
+pbr==4.0.2
 py2casefold==1.0.1
 pyasn1-modules==0.2.1
 pyasn1==0.4.2
@@ -36,7 +36,7 @@ six==1.11.0
 testtools==2.3.0
 toolz==0.9.0
 traceback2==1.4.0
-twisted[tls]==17.9.0
+twisted[tls]==18.4.0
 txspinneret==0.1.3
 unittest2==1.1.0
-zope.interface==4.4.3
+zope.interface==4.5.0