diff --git a/CHANGELOG b/CHANGELOG
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,3 +1,9 @@
+concurrent-output (1.7.3) unstable; urgency=medium
+
+  * Update async dep to allow 2.1.
+
+ -- Joey Hess <id@joeyh.name>  Tue, 05 Jan 2016 14:07:43 -0400
+
 concurrent-output (1.7.2) unstable; urgency=medium
 
   * Running a process within displayConsoleRegions caused a small
diff --git a/concurrent-output.cabal b/concurrent-output.cabal
--- a/concurrent-output.cabal
+++ b/concurrent-output.cabal
@@ -1,5 +1,5 @@
 Name: concurrent-output
-Version: 1.7.2
+Version: 1.7.3
 Cabal-Version: >= 1.8
 License: BSD2
 Maintainer: Joey Hess <id@joeyh.name>
@@ -32,7 +32,7 @@
   GHC-Options: -Wall -fno-warn-tabs -O2
   Build-Depends: base (>= 4.6), base < 5
     , text (>= 0.11.0 && < 1.3.0)
-    , async (>= 2.0 && < 2.1)
+    , async (>= 2.0 && < 2.2)
     , stm (>= 2.0 && < 2.5)
     , process (>= 1.1.0 && < 1.4.0)
     , directory (>= 1.2.0 && < 1.3.0)