diff --git a/pkgs/development/libraries/capnproto/default.nix b/pkgs/development/libraries/capnproto/default.nix
index da6aae64db52..a27a54b1eacb 100644
--- a/pkgs/development/libraries/capnproto/default.nix
+++ b/pkgs/development/libraries/capnproto/default.nix
@@ -2,11 +2,11 @@
 
 stdenv.mkDerivation rec {
   pname = "capnproto";
-  version = "0.8.0";
+  version = "0.9.0";
 
   src = fetchurl {
     url = "https://capnproto.org/capnproto-c++-${version}.tar.gz";
-    sha256 = "03f1862ljdshg7d0rg3j7jzgm3ip55kzd2y91q7p0racax3hxx6i";
+    sha256 = "sha256-soBUp6K/6kK/w5LI0AljDZTXLozoaiOtbxi15yV0Bk8=";
   };
 
   meta = with lib; {