diff --git a/package-lock.json b/package-lock.json
index af4f26a098..9d238cc22c 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -5240,9 +5240,9 @@
       "integrity": "sha512-zAoAQiudy+r5SvnSw3KJy5os/oRJYHzrzja/tBDqrZtNhUw8bt6y8OBzMWcjWr+8liV8Eb6yOhw8WZ7VFZ5ZzA=="
     },
     "flow-bin": {
-      "version": "0.145.0",
-      "resolved": "https://registry.npmjs.org/flow-bin/-/flow-bin-0.145.0.tgz",
-      "integrity": "sha512-+9fi9BMxRBtSWC1x0hWggWTb8Vih+AC7wyvLAX5wR1m6u2lF2HLtixXqy2GX8bWgaynSEJR5lmPxYYC4wMI8cA==",
+      "version": "0.146.0",
+      "resolved": "https://registry.npmjs.org/flow-bin/-/flow-bin-0.146.0.tgz",
+      "integrity": "sha512-TP8eCwltqc7fo6ad5klgsrZ2veZIK2qM1vHf1A/cnXTStPh8hLAz1cOXmlQIFZR/7fjSMI39TS3CgF6M/HUhAw==",
       "dev": true
     },
     "fluent-syntax": {
diff --git a/package.json b/package.json
index fc0321f09e..cd1909bc40 100644
--- a/package.json
+++ b/package.json
@@ -111,7 +111,7 @@
     "eslint-plugin-async-await": "0.0.0",
     "eslint-plugin-flowtype": "5.3.1",
     "eslint-plugin-import": "2.22.1",
-    "flow-bin": "0.145.0",
+    "flow-bin": "0.146.0",
     "git-rev-sync": "3.0.1",
     "html-entities": "2.1.0",
     "mocha": "8.3.1",
diff --git a/tests/functional/test.cli.sign.js b/tests/functional/test.cli.sign.js
index 83ddce6afd..5fd18f8eef 100644
--- a/tests/functional/test.cli.sign.js
+++ b/tests/functional/test.cli.sign.js
@@ -37,9 +37,10 @@ describe('web-ext sign', () => {
 
   beforeEach(() => {
     return new Promise((resolve, reject) => {
-      fakeServerProcess = spawn(process.execPath, [fakeServerPath]);
-      fakeServerProcess.stdout.on('data', resolve);
-      fakeServerProcess.stderr.on('data', reject);
+      const newProcess = spawn(process.execPath, [fakeServerPath]);
+      newProcess.stdout.on('data', resolve);
+      newProcess.stderr.on('data', reject);
+      fakeServerProcess = newProcess;
     });
   });