diff --git a/pkgs/development/libraries/libev/default.nix b/pkgs/development/libraries/libev/default.nix
index 922207f1cce..365c128239d 100644
--- a/pkgs/development/libraries/libev/default.nix
+++ b/pkgs/development/libraries/libev/default.nix
@@ -2,11 +2,11 @@
 
 stdenv.mkDerivation rec {
   name = "libev-${version}";
-  version="4.25";
+  version="4.27";
 
   src = fetchurl {
     url = "http://dist.schmorp.de/libev/Attic/${name}.tar.gz";
-    sha256 = "1295q0lkkbrlpd5dl5i48bh1rm8mjzh9y795jlvjz3bp4wf7wxbq";
+    sha256 = "0kil23cgsp0r5shvnwwbsy7fzxb62sxqzqbkbkfp5w54ipy2cm9d";
   };
 
   meta = {