diff --git a/nixos/doc/manual/from_md/release-notes/rl-2111.section.xml b/nixos/doc/manual/from_md/release-notes/rl-2111.section.xml
index 25f984f9378f..4e28e48691a7 100644
--- a/nixos/doc/manual/from_md/release-notes/rl-2111.section.xml
+++ b/nixos/doc/manual/from_md/release-notes/rl-2111.section.xml
@@ -1477,6 +1477,13 @@ Superuser created successfully.
           <literal>/etc/xdg/mimeapps.list</literal>.
         </para>
       </listitem>
+      <listitem>
+        <para>
+          Kopia was upgraded from 0.8.x to 0.9.x. Please read the
+          <link xlink:href="https://github.com/kopia/kopia/releases/tag/v0.9.0">upstream
+          release notes</link> for changes and upgrade instructions.
+        </para>
+      </listitem>
     </itemizedlist>
   </section>
 </section>
diff --git a/nixos/doc/manual/release-notes/rl-2111.section.md b/nixos/doc/manual/release-notes/rl-2111.section.md
index 40a671e3efa9..7da6e09c8f50 100644
--- a/nixos/doc/manual/release-notes/rl-2111.section.md
+++ b/nixos/doc/manual/release-notes/rl-2111.section.md
@@ -428,3 +428,5 @@ In addition to numerous new and upgraded packages, this release has the followin
   directories, thus increasing the purity of the build.
 
 - Three new options, [xdg.mime.addedAssociations](#opt-xdg.mime.addedAssociations), [xdg.mime.defaultApplications](#opt-xdg.mime.defaultApplications), and [xdg.mime.removedAssociations](#opt-xdg.mime.removedAssociations) have been added to the [xdg.mime](#opt-xdg.mime.enable) module to allow the configuration of `/etc/xdg/mimeapps.list`.
+
+- Kopia was upgraded from 0.8.x to 0.9.x. Please read the [upstream release notes](https://github.com/kopia/kopia/releases/tag/v0.9.0) for changes and upgrade instructions.
diff --git a/pkgs/tools/backup/kopia/default.nix b/pkgs/tools/backup/kopia/default.nix
index ad113ed615ef..ac552abda07d 100644
--- a/pkgs/tools/backup/kopia/default.nix
+++ b/pkgs/tools/backup/kopia/default.nix
@@ -2,16 +2,16 @@
 
 buildGoModule rec {
   pname = "kopia";
-  version = "0.8.4";
+  version = "0.9.0";
 
   src = fetchFromGitHub {
     owner = pname;
     repo = pname;
     rev = "v${version}";
-    sha256 = "sha256-Or6RL6yT/X3rVIySqt5lWbXbI25f8HNLBpY3cOhMC0g=";
+    sha256 = "sha256-xfGx9rtpLmotW00pB4822dwBzB2u+QYNSLWtA+JDffU=";
   };
 
-  vendorSha256 = "sha256-1FK5IIvm2iyzGqj8IPL3/qvxFj0dC37aycQQ5MO0mBI=";
+  vendorSha256 = "sha256-USWrI2vH0RpGJgxoEfEwqDUwXjxylOOqA9g7GltOdYQ=";
 
   doCheck = false;