diff --git a/.github/workflows/deploy.yml b/.github/workflows/deploy.yml
index 9384d2c..127006d 100644
--- a/.github/workflows/deploy.yml
+++ b/.github/workflows/deploy.yml
@@ -29,7 +29,7 @@ jobs:
 
       - uses: oven-sh/setup-bun@v2
         with:
-          bun-version: latest
+          bun-version: "1.4.0"
 
       - name: Install deps (root workspace)
         run: bun install --frozen-lockfile
diff --git a/flake.nix b/flake.nix
index 4a3bfa1..d72f16d 100644
--- a/flake.nix
+++ b/flake.nix
@@ -9,7 +9,20 @@
   outputs = { self, nixpkgs, flake-utils }:
     flake-utils.lib.eachSystem [ "x86_64-linux" ] (system:
       let
-        pkgs = import nixpkgs { inherit system; };
+        pkgs = import nixpkgs {
+          inherit system;
+          overlays = [
+            (self: super: {
+              bun = super.bun.overrideAttrs (old: rec {
+                version = "1.4.0";
+                src = super.fetchzip {
+                  url = "https://github.com/oven-sh/bun/releases/download/bun-v1.4.0/bun-linux-x64.zip";
+                  sha256 = "sha256:Poy0vf7yJ/hzk33QiQj5gnshI5Q7dfbaMD7xgwiyDKw=";
+                };
+              });
+            })
+          ];
+        };
       in
       {
         packages = {