diff --git a/requirements.txt b/requirements.txt
index dd2b978..774a589 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'
@@ -22,11 +22,11 @@ ipaddress==1.0.21
 lxml==4.2.4
 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