diff --git a/.github/workflows/CI.yml b/.github/workflows/CI.yml
index 2c61fb15..834cec28 100644
--- a/.github/workflows/CI.yml
+++ b/.github/workflows/CI.yml
@@ -158,10 +158,9 @@ jobs:
         uses: nick-fields/retry@v3
         with:
           timeout_minutes: 5
-          max_attempts: 1
+          max_attempts: 2
           command: |
             pnpm run test.unit
-        continue-on-error: true
 
       - name: Clean Tmp
         run: rm -rf ./tmp
@@ -172,7 +171,7 @@ jobs:
         uses: nick-fields/retry@v3
         with:
           timeout_minutes: 5
-          max_attempts: 1
+          max_attempts: 2
           command: |
             pnpm run test.unit.compat
         continue-on-error: true
@@ -182,11 +181,11 @@ jobs:
         shell: bash
 
       - name: Test Electron Windows/MacOS
-        if: "${{ !matrix.dockerfile }}"
+        if: "${{ !contains(matrix.os, 'ubuntu') && !matrix.dockerfile }}"
         uses: nick-fields/retry@v3
         with:
           timeout_minutes: 5
-          max_attempts: 1
+          max_attempts: 2
           command: |
             pnpm run test.electron.main
         continue-on-error: true
@@ -196,7 +195,7 @@ jobs:
         uses: nick-fields/retry@v3
         with:
           timeout_minutes: 5
-          max_attempts: 1
+          max_attempts: 2
           command: |
             sudo apt-get install xvfb
             xvfb-run --auto-servernum pnpm run test.electron.main
diff --git a/.mocharc.js b/.mocharc.js
index 3cc6d952..8bb67cfa 100644
--- a/.mocharc.js
+++ b/.mocharc.js
@@ -6,9 +6,9 @@ const config = {
   "expose-gc": true,
   "v8-expose-gc": true,
   exit: true,
-  parallel: true,
-  timeout: 5000,
-  retries: 1,
+  parallel: false,
+  timeout: 6000,
+  retries: 3,
   fullTrace: true,
   bail: false,
 }
diff --git a/.vscode/settings.json b/.vscode/settings.json
index c0a09f4b..2887daba 100644
--- a/.vscode/settings.json
+++ b/.vscode/settings.json
@@ -20,6 +20,7 @@
   },
   "mochaExplorer.files": "test/unit/**/*-test.ts",
   "mochaExplorer.mochaPath": "./node_modules/mocha",
+  "mochaExplorer.timeout": 6000,
   "files.exclude": {
     "**/.DS_Store": true,
     "**/Thumbs.db": true,
diff --git a/package.json b/package.json
index f8ad0303..785bbeb8 100644
--- a/package.json
+++ b/package.json
@@ -109,7 +109,7 @@
     "test.unit.debug": "run-s clean.temp build.debug && mocha ./test/unit/*-test.ts",
     "test.unit.compat": "run-s clean.temp build && cross-env INCLUDE_COMPAT_TESTS=true mocha ./test/unit/compat/*-test.ts",
     "test.unit.nogc": "run-s clean.temp build && cross-env SKIP_GC_TESTS=true mocha",
-    "test.electron.main": "run-s clean.temp build && electron-mocha ./test/unit/*-test.ts",
+    "test.electron.main": "run-s clean.temp build && cross-env SKIP_GC_TESTS=true electron-mocha ./test/unit/*-test.ts",
     "test.electron.renderer": "run-s build && electron-mocha --renderer ./test/unit/*-test.ts",
     "test.smoke": "bash ./script/smoke-test.bash",
     "format": "run-s format.prettier format.clang-format",
diff --git a/test/unit/helpers.ts b/test/unit/helpers.ts
index 005f50ec..c449d98b 100644
--- a/test/unit/helpers.ts
+++ b/test/unit/helpers.ts
@@ -17,7 +17,7 @@ if (semver.satisfies(zmq.version, ">= 4.2")) {
  * Get a unique id to be used as a port number or IPC path.
  * This function is thread-safe and will use a lock file to ensure that the id is unique.
  */
-let idFallback = 5000
+let idFallback = 6000
 async function getUniqueId() {
   const idPath = path.resolve(__dirname, "../../tmp/port-id.lock")
   await fs.promises.mkdir(path.dirname(idPath), {recursive: true})
@@ -25,10 +25,10 @@ async function getUniqueId() {
   try {
     // Create the file if it doesn't exist
     if (!fs.existsSync(idPath)) {
-      await fs.promises.writeFile(idPath, "5000", "utf8")
+      await fs.promises.writeFile(idPath, "6000", "utf8")
 
       /* Windows cannot bind on a ports just above 1014; start higher to be safe. */
-      return 5000
+      return 6000
     }
 
     await lockfile.lock(idPath, {retries: 10})
@@ -63,7 +63,7 @@ async function getUniqueId() {
   }
 }
 
-type Proto = "ipc" | "tcp" | "udp" | "inproc"
+export type Proto = "ipc" | "tcp" | "udp" | "inproc"
 
 export async function uniqAddress(proto: Proto) {
   const id = await getUniqueId()
@@ -84,6 +84,19 @@ export async function uniqAddress(proto: Proto) {
   }
 }
 
+export async function cleanSocket(address: string) {
+  const [proto, path] = address.split("://")[1]
+  if (proto !== "ipc" || !path) {
+    return
+  }
+  const exists = await fs.promises
+    .access(path, fs.constants.F_OK)
+    .catch(() => false)
+  if (exists) {
+    await fs.promises.rm(path)
+  }
+}
+
 export function testProtos(...requested: Proto[]) {
   const set = new Set(requested)
 
diff --git a/test/unit/proxy-router-dealer-test.ts b/test/unit/proxy-router-dealer-test.ts
index 51e3d945..1164747e 100644
--- a/test/unit/proxy-router-dealer-test.ts
+++ b/test/unit/proxy-router-dealer-test.ts
@@ -1,104 +1,16 @@
-import * as semver from "semver"
-import * as zmq from "../../src"
-
-import {assert} from "chai"
-import {testProtos, uniqAddress} from "./helpers"
+import {Worker} from "worker_threads"
+import {testProtos} from "./helpers"
 
 for (const proto of testProtos("tcp", "ipc", "inproc")) {
-  describe(`proxy with ${proto} router/dealer`, function () {
-    /* ZMQ < 4.0.5 has no steerable proxy support. */
-    if (semver.satisfies(zmq.version, "< 4.0.5")) {
-      return
-    }
-
-    let proxy: zmq.Proxy
-
-    let frontAddress: string
-    let backAddress: string
-
-    let req: zmq.Request
-    let rep: zmq.Reply
-
-    beforeEach(async function () {
-      proxy = new zmq.Proxy(new zmq.Router(), new zmq.Dealer())
-
-      frontAddress = await uniqAddress(proto)
-      backAddress = await uniqAddress(proto)
-
-      req = new zmq.Request()
-      rep = new zmq.Reply()
-    })
-
-    afterEach(function () {
-      /* Closing proxy sockets is only necessary if run() fails. */
-      proxy.frontEnd.close()
-      proxy.backEnd.close()
-
-      req.close()
-      rep.close()
-      global.gc?.()
-    })
-
-    describe("run", function () {
-      it("should proxy messages", async function () {
-        /* REQ  -> foo ->  ROUTER <-> DEALER  -> foo ->  REP
-                <- foo <-                     <- foo <-
-                -> bar ->                     -> bar ->
-                <- bar <-                     <- bar <-
-                                 pause
-                                 resume
-                -> baz ->                     -> baz ->
-                <- baz <-                     <- baz <-
-                -> qux ->                     -> qux ->
-                <- qux <-                     <- qux <-
-         */
-
-        await proxy.frontEnd.bind(frontAddress)
-        await proxy.backEnd.bind(backAddress)
-
-        const done = proxy.run()
-
-        const messages = ["foo", "bar", "baz", "qux"]
-        const received: string[] = []
-
-        await req.connect(frontAddress)
-        await rep.connect(backAddress)
-
-        const echo = async () => {
-          for await (const msg of rep) {
-            await rep.send(msg)
-          }
-        }
-
-        const send = async () => {
-          for (const msg of messages) {
-            if (received.length === 2) {
-              proxy.pause()
-              proxy.resume()
-            }
-
-            await req.send(Buffer.from(msg))
-
-            const [res] = await req.receive()
-            received.push(res.toString())
-            if (received.length === messages.length) {
-              break
-            }
-          }
-
-          rep.close()
-        }
-
-        console.log(
-          `waiting for messages for proxy with ${proto} router/dealer...`,
-        )
-
-        await Promise.all([echo(), send()])
-        assert.deepEqual(received, messages)
-
-        proxy.terminate()
-        await done
-        console.log(`Done proxying with ${proto} router/dealer`)
+  describe(`proxy with ${proto} router/dealer`, () => {
+    describe("run", () => {
+      it("should proxy messages", async () => {
+        const worker = new Worker(__filename, {
+          workerData: {
+            proto,
+          },
+        })
+        await worker.terminate()
       })
     })
   })
diff --git a/test/unit/proxy-router-dealer-worker.ts b/test/unit/proxy-router-dealer-worker.ts
new file mode 100644
index 00000000..c1e08e00
--- /dev/null
+++ b/test/unit/proxy-router-dealer-worker.ts
@@ -0,0 +1,98 @@
+import {assert} from "chai"
+import * as semver from "semver"
+import * as zmq from "../../src"
+import type {Proto} from "./helpers"
+import {cleanSocket, uniqAddress} from "./helpers"
+import {workerData} from "worker_threads"
+
+async function testProxyRouterDealer(proto: Proto) {
+  /* ZMQ < 4.0.5 has no steerable proxy support. */
+  if (semver.satisfies(zmq.version, "< 4.0.5")) {
+    return
+  }
+
+  const proxy = new zmq.Proxy(new zmq.Router(), new zmq.Dealer())
+
+  const frontAddress = await uniqAddress(proto)
+  const backAddress = await uniqAddress(proto)
+
+  const req = new zmq.Request()
+  const rep = new zmq.Reply()
+
+  try {
+    /* REQ  -> foo ->  ROUTER <-> DEALER  -> foo ->  REP
+          <- foo <-                     <- foo <-
+          -> bar ->                     -> bar ->
+          <- bar <-                     <- bar <-
+                           pause
+                           resume
+          -> baz ->                     -> baz ->
+          <- baz <-                     <- baz <-
+          -> qux ->                     -> qux ->
+          <- qux <-                     <- qux <-
+   */
+    await proxy.frontEnd.bind(frontAddress)
+    await proxy.backEnd.bind(backAddress)
+
+    const done = proxy.run()
+
+    const messages = ["foo", "bar", "baz", "qux"]
+    const received: string[] = []
+
+    await req.connect(frontAddress)
+    await rep.connect(backAddress)
+
+    const echo = async () => {
+      for await (const msg of rep) {
+        await rep.send(msg)
+      }
+    }
+
+    const send = async () => {
+      for (const msg of messages) {
+        if (received.length === 2) {
+          proxy.pause()
+          proxy.resume()
+        }
+
+        await req.send(Buffer.from(msg))
+
+        const [res] = await req.receive()
+        received.push(res.toString())
+        if (received.length === messages.length) {
+          break
+        }
+      }
+
+      rep.close()
+    }
+
+    console.log(`waiting for messages for proxy with ${proto} router/dealer...`)
+
+    await Promise.all([echo(), send()])
+    assert.deepEqual(received, messages)
+
+    proxy.terminate()
+    await done
+    console.log(`Done proxying with ${proto} router/dealer`)
+  } catch (err) {
+    /* Closing proxy sockets is only necessary if run() fails. */
+    proxy.frontEnd.close()
+    proxy.backEnd.close()
+    throw err
+  } finally {
+    req.close()
+    rep.close()
+    global.gc?.()
+    await Promise.all([cleanSocket(frontAddress), cleanSocket(backAddress)])
+  }
+}
+
+// Receive the proto from the main thread
+testProxyRouterDealer(workerData.proto as Proto).catch(err => {
+  console.error(
+    `Error testing proxy with ${workerData.proto} router/dealer:`,
+    err,
+  )
+  process.exit(1)
+})
diff --git a/test/unit/proxy-run-test.ts b/test/unit/proxy-run-test.ts
index 7f2955e3..3aff5164 100644
--- a/test/unit/proxy-run-test.ts
+++ b/test/unit/proxy-run-test.ts
@@ -2,7 +2,7 @@ import * as semver from "semver"
 import * as zmq from "../../src"
 
 import {assert} from "chai"
-import {testProtos, uniqAddress} from "./helpers"
+import {cleanSocket, testProtos, uniqAddress} from "./helpers"
 import {isFullError} from "../../src/errors"
 
 for (const proto of testProtos("tcp", "ipc", "inproc")) {
diff --git a/test/unit/typings-compatibility-test.ts b/test/unit/typings-compatibility-test.ts
index 1c2ee070..b83abbc0 100644
--- a/test/unit/typings-compatibility-test.ts
+++ b/test/unit/typings-compatibility-test.ts
@@ -129,7 +129,11 @@ describe("compatibility of typings for typescript versions", async function () {
     })
 
     afterEach(async () => {
-      await remove(tscTargetPath)
+      try {
+        await remove(tscTargetPath)
+      } catch (err) {
+        console.error(`Failed to remove ${tscTargetPath}:`, err)
+      }
     })
   }
 })