diff --git a/pkgs/development/libraries/capnproto/default.nix b/pkgs/development/libraries/capnproto/default.nix
index 0eaf6eda07a5..cda5f005f9a2 100644
--- a/pkgs/development/libraries/capnproto/default.nix
+++ b/pkgs/development/libraries/capnproto/default.nix
@@ -1,15 +1,19 @@
-{ lib, stdenv, fetchFromGitHub, capnproto, cmake }:
+{ lib
+, stdenv
+, fetchFromGitHub
+, capnproto
+, cmake }:
 
 stdenv.mkDerivation rec {
   pname = "capnproto";
-  version = "0.9.0";
+  version = "0.9.1";
 
   # release tarballs are missing some ekam rules
   src = fetchFromGitHub {
     owner = "capnproto";
     repo = "capnproto";
     rev = "v${version}";
-    sha256 = "038i40apywn8sg95kwld4mg9p9m08izcw5xj7mwkmshycmqw65na";
+    sha256 = "0cbiwkmd29abih8rjjm35dfkrkr8c6axbzq3fkryay6jyvpi42c5";
   };
 
   nativeBuildInputs = [ cmake ]
diff --git a/pkgs/development/python-modules/pycapnp/default.nix b/pkgs/development/python-modules/pycapnp/default.nix
index 7e8954e04d0c..8c63a1186223 100644
--- a/pkgs/development/python-modules/pycapnp/default.nix
+++ b/pkgs/development/python-modules/pycapnp/default.nix
@@ -10,14 +10,14 @@
 
 buildPythonPackage rec {
   pname = "pycapnp";
-  version = "1.0.0";
+  version = "1.1.0";
   disabled = isPyPy || isPy27;
 
   src = fetchFromGitHub {
     owner = "capnproto";
     repo = pname;
     rev = "v${version}";
-    sha256 = "1n6dq2fbagi3wvrpkyb7wx4y15nkm2grln4y75hrqgmnli8ggi9v";
+    sha256 = "1xi6df93ggkpmwckwbi356v7m32zv5qry8s45hvsps66dz438kmi";
   };
 
   buildInputs = [ capnproto cython pkgconfig ];