upgrade activitystream 0.4.1 -> 0.4.2
diff --git a/requirements.txt b/requirements.txt
index 29dccfe..cbe63a9 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -4,7 +4,7 @@
 #
 #    pip-compile
 #
-activitystream==0.4.1
+activitystream==0.4.2
     # via -r requirements.in
 beaker==1.12.1
     # via