diff --git a/LICENSE b/LICENSE
--- a/LICENSE
+++ b/LICENSE
@@ -1,4 +1,4 @@
-Copyright (c) 2012-2014, Renzo Carbonara
+Copyright (c) 2012-2016, Renzo Carbonara
 Copyright (c) 2012, Paolo Capriotti
 
 All rights reserved.
diff --git a/changelog.md b/changelog.md
--- a/changelog.md
+++ b/changelog.md
@@ -1,3 +1,8 @@
+# Version 0.5.1.3
+
+* Bump upper bound dependency on `transformers`.
+
+
 # Version 0.5.1.2
 
 * Bump upper bound dependency on `attoparsec`.
diff --git a/pipes-attoparsec.cabal b/pipes-attoparsec.cabal
--- a/pipes-attoparsec.cabal
+++ b/pipes-attoparsec.cabal
@@ -1,8 +1,8 @@
 name:               pipes-attoparsec
-version:            0.5.1.2
+version:            0.5.1.3
 license:            BSD3
 license-file:       LICENSE
-copyright:          Copyright (c) Renzo Carbonara 2012-2014, Paolo Capriotti 2012
+copyright:          Copyright (c) Renzo Carbonara 2012-2016, Paolo Capriotti 2012
 author:             Renzo Carbonara
 maintainer:         renzocarbonaraλgmail.com
 stability:          Experimental
@@ -33,7 +33,7 @@
     , pipes        (>=4.1      && <4.2)
     , pipes-parse  (>=3.0.1    && <3.1)
     , text         (>=0.11.2.0 && <1.3)
-    , transformers (>=0.2      && <0.5)
+    , transformers (>=0.2      && <0.6)
   ghc-options: -Wall -O2
 
 test-suite tests