diff --git a/Dockerfile b/Dockerfile
index 56ea2c8..df6b74a 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -12,6 +12,7 @@ WORKDIR /app
 COPY . .
 RUN bun build scripts/outbox-worker.ts \
     --target=bun \
+    --conditions=react-server \
     --minify \
     --outfile=dist/outbox-worker.js && \
     bun build backend/discord.ts \
diff --git a/package.json b/package.json
index 8baaf34..52223b4 100644
--- a/package.json
+++ b/package.json
@@ -17,7 +17,7 @@
     "db:studio": "drizzle-kit studio",
     "import:guides": "bun scripts/import-google-guides.ts",
     "worker:discord": "bun backend/discord.ts",
-    "worker:outbox": "bun scripts/outbox-worker.ts",
+    "worker:outbox": "bun --conditions=react-server scripts/outbox-worker.ts",
     "security:audit": "bun scripts/security-audit.ts"
   },
   "dependencies": {
diff --git a/tests/deployment-contract.test.ts b/tests/deployment-contract.test.ts
index 5325220..66175dc 100644
--- a/tests/deployment-contract.test.ts
+++ b/tests/deployment-contract.test.ts
@@ -102,12 +102,23 @@ describe("production deployment contract", () => {
       "ENV NEXT_PUBLIC_GOOGLE_ADSENSE_CLIENT_ID=${NEXT_PUBLIC_GOOGLE_ADSENSE_CLIENT_ID}",
     );
     expect(dockerfile).toContain("backend/discord.ts");
+    expect(dockerfile).toMatch(
+      /bun build scripts\/outbox-worker\.ts[\s\S]*?--conditions=react-server[\s\S]*?--outfile=dist\/outbox-worker\.js/u,
+    );
     expect(dockerfile).toMatch(
       /bun build backend\/discord\.ts[\s\S]*?--conditions=react-server[\s\S]*?--outfile=dist\/discord\.js/u,
     );
     expect(dockerfile).toContain("./worker/discord.js");
   });
 
+  it("runs the outbox worker with server-only module resolution locally", async () => {
+    const packageJson = JSON.parse(await repositoryFile("package.json"));
+
+    expect(packageJson.scripts["worker:outbox"]).toBe(
+      "bun --conditions=react-server scripts/outbox-worker.ts",
+    );
+  });
+
   it("verifies first, publishes immutable images, and migrates before rollout", async () => {
     const workflow = await repositoryFile(".gitea/workflows/ci.yml");