diff --git a/flake.lock b/flake.lock
index 86ebe934..fde16f07 100644
--- a/flake.lock
+++ b/flake.lock
@@ -44,11 +44,11 @@
         "rust-analyzer-src": "rust-analyzer-src"
       },
       "locked": {
-        "lastModified": 1704781388,
-        "narHash": "sha256-QEmlnHkDkbDud5M+eXPvJpETXMaodtdM3fs635wzgfA=",
+        "lastModified": 1708410168,
+        "narHash": "sha256-98kCv2PbKfqt+oyyXHqdXPRRGjW+QEy9eBzNtRyCRHs=",
         "owner": "nix-community",
         "repo": "fenix",
-        "rev": "50818d34497c48efbf21b965cf247bda90ffc7e0",
+        "rev": "846fc5ddb810c36411de6587384bef86c2db5127",
         "type": "github"
       },
       "original": {
@@ -143,11 +143,11 @@
     "rust-analyzer-src": {
       "flake": false,
       "locked": {
-        "lastModified": 1704734508,
-        "narHash": "sha256-avMO21rwRepZXP3yJEgQDuFTatreWwyI6pau1jzuMtA=",
+        "lastModified": 1708361159,
+        "narHash": "sha256-HAZ/pEN0TVFoGMbITliYXbMLPaSy/X+WKY/y6K8iTr0=",
         "owner": "rust-lang",
         "repo": "rust-analyzer",
-        "rev": "12e7aa3132217cc6a6c1151d468be35d7b365999",
+        "rev": "2223b4fa71e543ac6dd1abd4770a69fab8dbdec1",
         "type": "github"
       },
       "original": {
diff --git a/flake.nix b/flake.nix
index 59d93946..c4eb5eab 100644
--- a/flake.nix
+++ b/flake.nix
@@ -39,9 +39,21 @@
       ];
       perSystem = { config, self', inputs', system, pkgs, lib, ... }:
         let
-          rustToolchain = inputs'.fenix.packages.stable.toolchain;
+          rustToolchain = with inputs'.fenix.packages; combine [
+            complete.toolchain
+            targets.wasm32-unknown-unknown.latest.rust-std
+          ];
           craneLib = inputs.crane.lib.${system}.overrideToolchain rustToolchain;
 
+          kairosOnChainAttrs = {
+            src = lib.cleanSourceWith {
+              src = craneLib.path ./kairos-deposit-contract;
+              filter = path: type: craneLib.filterCargoSources path type;
+            };
+            cargoExtraArgs = "--target wasm32-unknown-unknown";
+            doCheck = false;
+          };
+
           kairosNodeAttrs = {
             src = lib.cleanSourceWith {
               src = craneLib.path ./.;
@@ -73,6 +85,14 @@
               cargoArtifacts = self'.packages.kairos-deps;
             });
 
+            kairos-deposit-contract-deps = craneLib.buildPackage (kairosOnChainAttrs // {
+              pname = "kairos-deposit-contract";
+            });
+
+            kairos-deposit-contract = craneLib.buildPackage (kairosOnChainAttrs // {
+              cargoArtifacts = self'.packages.kairos-deposit-contract-deps;
+            });
+
             default = self'.packages.kairos;
 
             kairos-docs = craneLib.cargoDoc (kairosNodeAttrs // {