diff --git a/CHANGELOG.md b/CHANGELOG.md
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,6 @@
+## 0.3.5.2
+* Loose uppers bounds for async
+
 ## 0.3.5.1
 * Standarize style
 * When showing version information also show git branch and commit
diff --git a/hapistrano.cabal b/hapistrano.cabal
--- a/hapistrano.cabal
+++ b/hapistrano.cabal
@@ -1,5 +1,5 @@
 name:                hapistrano
-version:             0.3.5.1
+version:             0.3.5.2
 synopsis:            A deployment library for Haskell applications
 description:
   .
@@ -64,7 +64,7 @@
   other-modules:       Config
                      , Paths_hapistrano
   build-depends:       aeson              >= 0.11 && < 1.3
-                     , async              >= 2.0.1.6 && < 2.2
+                     , async              >= 2.0.1.6 && < 2.4
                      , base               >= 4.8 && < 5.0
                      , formatting         >= 6.2 && < 7.0
                      , gitrev             >= 1.2 && < 1.4