diff --git a/requirements.txt b/requirements.txt
index a41005e..3dfb08f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -19,17 +19,17 @@ extras==1.0.0
 fixtures==3.0.0
 fusion-util==1.3.0
 hyperlink==17.3.1
-hypothesis==3.38.0
+hypothesis==3.38.5
 idna==2.6
 incremental==17.5.0
 ipaddress==1.0.18
 linecache2==1.0.0
 pbr==3.1.1
 py2casefold==1.0.1
-pyasn1-modules==0.1.5
-pyasn1==0.3.7
-pyopenssl==17.3.0
-pyrsistent==0.14.0
+pyasn1-modules==0.2.1
+pyasn1==0.4.2
+pyopenssl==17.4.0
+pyrsistent==0.14.1
 python-mimeparse==1.6.0
 service-identity==17.0.0
 six==1.11.0