diff --git a/pkgs/applications/networking/pjsip/default.nix b/pkgs/applications/networking/pjsip/default.nix
index 2dc909ca915..558394199f4 100644
--- a/pkgs/applications/networking/pjsip/default.nix
+++ b/pkgs/applications/networking/pjsip/default.nix
@@ -1,11 +1,11 @@
 {stdenv, fetchurl, openssl, libsamplerate}:
 
 stdenv.mkDerivation rec {
-  name = "pjsip-1.8.10";
+  name = "pjsip-2.1";
 
   src = fetchurl {
-    url = http://www.pjsip.org/release/1.8.10/pjproject-1.8.10.tar.bz2;
-    sha256 = "1v2mgbgzn7d3msb406jmg69ms97a0rqg58asykx71dmjipbaiqc0";
+    url = http://www.pjsip.org/release/2.1/pjproject-2.1.tar.bz2;
+    md5 = "310eb63638dac93095f6a1fc8ee1f578";
   };
 
   buildInputs = [ openssl libsamplerate ];