diff --git a/pkgs/servers/matrix-synapse/sliding-sync/default.nix b/pkgs/servers/matrix-synapse/sliding-sync/default.nix
new file mode 100644
index 000000000000..a2c6f79fb338
--- /dev/null
+++ b/pkgs/servers/matrix-synapse/sliding-sync/default.nix
@@ -0,0 +1,37 @@
+{ lib
+, buildGoModule
+, fetchFromGitHub
+}:
+
+buildGoModule rec {
+  pname = "matrix-sliding-sync";
+  version = "0.99.3";
+
+  src = fetchFromGitHub {
+    owner = "matrix-org";
+    repo = "sliding-sync";
+    rev = "v${version}";
+    hash = "sha256-lmmOq0gkvrIXQmy3rbTga0cC85t0LWjDOqrH1NWUpdA=";
+  };
+
+  vendorHash = "sha256-447P2TbBUEHmHubHiiZCrFVCj2/tmEuYFzLo27UyCk4=";
+
+  subPackages = [ "cmd/syncv3" ];
+
+  ldflags = [
+    "-s"
+    "-w"
+    "-X main.GitCommit=${src.rev}"
+  ];
+
+  # requires a running matrix-synapse
+  doCheck = false;
+
+  meta = with lib; {
+    description = "A sliding sync implementation of MSC3575 for matrix";
+    homepage = "https://github.com/matrix-org/sliding-sync";
+    license = with licenses; [ asl20 ];
+    maintainers = with maintainers; [ SuperSandro2000 emilylange ];
+    mainProgram = "syncv3";
+  };
+}
diff --git a/pkgs/top-level/all-packages.nix b/pkgs/top-level/all-packages.nix
index e1e5ba389773..c117333ee4e0 100644
--- a/pkgs/top-level/all-packages.nix
+++ b/pkgs/top-level/all-packages.nix
@@ -9544,6 +9544,8 @@ with pkgs;
 
   matrix-conduit = callPackage ../servers/matrix-conduit { };
 
+  matrix-sliding-sync = callPackage ../servers/matrix-synapse/sliding-sync { };
+
   matrix-synapse = callPackage ../servers/matrix-synapse { };
 
   matrix-synapse-plugins = recurseIntoAttrs matrix-synapse.plugins;