diff --git a/CHANGELOG.markdown b/CHANGELOG.markdown
--- a/CHANGELOG.markdown
+++ b/CHANGELOG.markdown
@@ -1,3 +1,7 @@
+4.2.1.1
+-------
+* Support `nats` version 1
+
 4.2.1
 -----
 * Added `stochasticGradientDescent`.
diff --git a/ad.cabal b/ad.cabal
--- a/ad.cabal
+++ b/ad.cabal
@@ -1,5 +1,5 @@
 name:         ad
-version:      4.2.1
+version:      4.2.1.1
 license:      BSD3
 license-File: LICENSE
 copyright:    (c) Edward Kmett 2010-2014,
@@ -109,7 +109,7 @@
     data-reify       >= 0.6   && < 0.7,
     erf              >= 2.0   && < 2.1,
     free             >= 4.6.1 && < 5,
-    nats             >= 0.1.2 && < 1,
+    nats             >= 0.1.2 && < 2,
     reflection       >= 1.4   && < 2,
     transformers     >= 0.3   && < 0.5