diff --git a/pkgs/development/libraries/libev/default.nix b/pkgs/development/libraries/libev/default.nix
index 371c0b1d9809..74aa8133a99f 100644
--- a/pkgs/development/libraries/libev/default.nix
+++ b/pkgs/development/libraries/libev/default.nix
@@ -2,11 +2,11 @@
 
 stdenv.mkDerivation rec {
   pname = "libev";
-  version="4.31";
+  version="4.33";
 
   src = fetchurl {
     url = "http://dist.schmorp.de/libev/Attic/${pname}-${version}.tar.gz";
-    sha256 = "0nkfqv69wfyy2bpga4d53iqydycpik8jp8x6q70353hia8mmv1gd";
+    sha256 = "1sjs4324is7fp21an4aas2z4dwsvs6z4xwrmp72vwpq1s6wbfzjh";
   };
 
   configureFlags = stdenv.lib.optional (static) "LDFLAGS=-static";