diff --git a/src-tauri/Cargo.lock b/src-tauri/Cargo.lock
index 2e493b36..a201eec9 100644
--- a/src-tauri/Cargo.lock
+++ b/src-tauri/Cargo.lock
@@ -6139,7 +6139,7 @@ dependencies = [
 
 [[package]]
 name = "trcaa"
-version = "0.1.0"
+version = "0.2.50"
 dependencies = [
  "aes-gcm",
  "aho-corasick",
diff --git a/tests/unit/ciDockerBuilders.test.ts b/tests/unit/ciDockerBuilders.test.ts
index bc2d2541..92f3225f 100644
--- a/tests/unit/ciDockerBuilders.test.ts
+++ b/tests/unit/ciDockerBuilders.test.ts
@@ -129,8 +129,12 @@ describe("build-images.yml workflow", () => {
     expect(wf).toContain("trcaa-linux-arm64:rust1.88-node22");
   });
 
-  it("uses docker:24-cli image for build jobs", () => {
-    expect(wf).toContain("docker:24-cli");
+  it("uses alpine:latest with docker-cli (not docker:24-cli which triggers duplicate socket mount in act_runner)", () => {
+    // act_runner v0.3.1 special-cases docker:* images and adds the socket bind;
+    // combined with its global socket bind this causes a 'Duplicate mount point' error.
+    expect(wf).toContain("alpine:latest");
+    expect(wf).toContain("docker-cli");
+    expect(wf).not.toContain("docker:24-cli");
   });
 
   it("runs all three build jobs on linux-amd64 runner", () => {
diff --git a/tests/unit/releaseWorkflowCrossPlatformArtifacts.test.ts b/tests/unit/releaseWorkflowCrossPlatformArtifacts.test.ts
index eeea410a..abe69ac1 100644
--- a/tests/unit/releaseWorkflowCrossPlatformArtifacts.test.ts
+++ b/tests/unit/releaseWorkflowCrossPlatformArtifacts.test.ts
@@ -44,11 +44,13 @@ describe("auto-tag release cross-platform artifact handling", () => {
     expect(workflow).toContain("UPLOAD_NAME=\"linux-arm64-$NAME\"");
   });
 
-  it("uses Ubuntu 22.04 with ports mirror for arm64 cross-compile", () => {
+  it("uses pre-baked Ubuntu 22.04 cross-compiler image for arm64", () => {
     const workflow = readFileSync(autoTagWorkflowPath, "utf-8");
 
-    expect(workflow).toContain("ubuntu:22.04");
-    expect(workflow).toContain("ports.ubuntu.com/ubuntu-ports");
-    expect(workflow).toContain("jammy");
+    // Multiarch ubuntu:22.04 + ports mirror setup moved to pre-baked image;
+    // verify workflow references the correct image and cross-compile env vars.
+    expect(workflow).toContain("trcaa-linux-arm64:rust1.88-node22");
+    expect(workflow).toContain("CC_aarch64_unknown_linux_gnu: aarch64-linux-gnu-gcc");
+    expect(workflow).toContain("aarch64-unknown-linux-gnu");
   });
 });