diff --git a/CHANGES.md b/CHANGES.md
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,3 +1,8 @@
+## 0.1.0.3 (2015-02-11)
+
+ * Allow base 4.9.
+ * Pass -march=i686 to C compilers to enable atomics
+
 ## 0.1.0.2 (2014-09-30)
 
  * Bump upper bound on text to 1.3
diff --git a/ekg-core.cabal b/ekg-core.cabal
--- a/ekg-core.cabal
+++ b/ekg-core.cabal
@@ -1,5 +1,5 @@
 name:                ekg-core
-version:             0.1.0.2
+version:             0.1.0.3
 synopsis:            Tracking of system metrics
 description:
   This library lets you defined and track system metrics.
@@ -29,7 +29,7 @@
 
   build-depends:
     ghc-prim < 0.4,
-    base >= 4.5 && < 4.8,
+    base >= 4.5 && < 4.9,
     containers >= 0.5 && < 0.6,
     text < 1.3,
     unordered-containers < 0.3
@@ -37,6 +37,8 @@
   default-language:    Haskell2010
 
   ghc-options: -Wall
+  if arch(i386)
+    cc-options: -march=i686
   includes: distrib.h
   install-includes: distrib.h
   include-dirs: cbits