diff --git a/pkgs/tools/networking/shadowsocks-libev/default.nix b/pkgs/tools/networking/shadowsocks-libev/default.nix
index 26e932fc5d5e..254e5d3e5d32 100644
--- a/pkgs/tools/networking/shadowsocks-libev/default.nix
+++ b/pkgs/tools/networking/shadowsocks-libev/default.nix
@@ -5,14 +5,14 @@
 
 stdenv.mkDerivation rec {
   pname = "shadowsocks-libev";
-  version = "3.3.0";
+  version = "3.3.1";
 
   # Git tag includes CMake build files which are much more convenient.
   src = fetchFromGitHub {
     owner = "shadowsocks";
     repo = pname;
     rev = "refs/tags/v${version}";
-    sha256 = "0f6fk7p49b1m78v4ipacbl522nma9b3qzrvihzp2mmsa6j3cysgr";
+    sha256 = "0l15mbwlzx446rn5cix9f1726by62807bhnxkzknd41j7r937vyv";
     fetchSubmodules = true;
   };