diff --git a/package-lock.json b/package-lock.json
index f4b36e1a2..1f064c2a1 100644
--- a/package-lock.json
+++ b/package-lock.json
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     "string_decoder": {
       "version": "1.1.1",
-      "resolved": "https://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
+      "resolved": "http://registry.npmjs.org/string_decoder/-/string_decoder-1.1.1.tgz",
       "integrity": "sha512-n/ShnvDi6FHbbVfviro+WojiFzv+s8MPMHBczVePfUpDJLwoLT0ht1l4YwBCbi8pJAveEEdnkHyPyTP/mzRfwg==",
       "dev": true,
       "requires": {
@@ -7744,6 +8045,12 @@
       "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-1.0.0.tgz",
       "integrity": "sha1-J1hIEIkUVqQXHI0CJkQa3pDLyus="
     },
+    "workerpool": {
+      "version": "6.0.0",
+      "resolved": "https://registry.npmjs.org/workerpool/-/workerpool-6.0.0.tgz",
+      "integrity": "sha512-fU2OcNA/GVAJLLyKUoHkAgIhKb0JoCpSjLC/G2vYKxUjVmQwGbRVeoPJ1a8U4pnVofz4AQV5Y/NEw8oKqxEBtA==",
+      "dev": true
+    },
     "wrap-ansi": {
       "version": "2.1.0",
       "resolved": "https://registry.npmjs.org/wrap-ansi/-/wrap-ansi-2.1.0.tgz",
@@ -8029,14 +8336,16 @@
       }
     },
     "yargs-unparser": {
-      "version": "1.6.0",
-      "resolved": "https://registry.npmjs.org/yargs-unparser/-/yargs-unparser-1.6.0.tgz",
-      "integrity": "sha512-W9tKgmSn0DpSatfri0nx52Joq5hVXgeLiqR/5G0sZNDoLZFOr/xjBUDcShCOGNsBnEMNo1KAMBkTej1Hm62HTw==",
+      "version": "1.6.1",
+      "resolved": "https://registry.npmjs.org/yargs-unparser/-/yargs-unparser-1.6.1.tgz",
+      "integrity": "sha512-qZV14lK9MWsGCmcr7u5oXGH0dbGqZAIxTDrWXZDo5zUr6b6iUmelNKO6x6R1dQT24AH3LgRxJpr8meWy2unolA==",
       "dev": true,
       "requires": {
+        "camelcase": "^5.3.1",
+        "decamelize": "^1.2.0",
         "flat": "^4.1.0",
-        "lodash": "^4.17.15",
-        "yargs": "^13.3.0"
+        "is-plain-obj": "^1.1.0",
+        "yargs": "^14.2.3"
       },
       "dependencies": {
         "ansi-regex": {
@@ -8100,12 +8409,13 @@
           }
         },
         "yargs": {
-          "version": "13.3.2",
-          "resolved": "https://registry.npmjs.org/yargs/-/yargs-13.3.2.tgz",
-          "integrity": "sha512-AX3Zw5iPruN5ie6xGRIDgqkT+ZhnRlZMLMHAs8tg7nRruy2Nb+i5o9bwghAogtM08q1dpr2LVoS8KSTMYpWXUw==",
+          "version": "14.2.3",
+          "resolved": "https://registry.npmjs.org/yargs/-/yargs-14.2.3.tgz",
+          "integrity": "sha512-ZbotRWhF+lkjijC/VhmOT9wSgyBQ7+zr13+YLkhfsSiTriYsMzkTUFP18pFhWwBeMa5gUc1MzbhrO6/VB7c9Xg==",
           "dev": true,
           "requires": {
             "cliui": "^5.0.0",
+            "decamelize": "^1.2.0",
             "find-up": "^3.0.0",
             "get-caller-file": "^2.0.1",
             "require-directory": "^2.1.1",
@@ -8114,13 +8424,13 @@
             "string-width": "^3.0.0",
             "which-module": "^2.0.0",
             "y18n": "^4.0.0",
-            "yargs-parser": "^13.1.2"
+            "yargs-parser": "^15.0.1"
           }
         },
         "yargs-parser": {
-          "version": "13.1.2",
-          "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-13.1.2.tgz",
-          "integrity": "sha512-3lbsNRf/j+A4QuSZfDRA7HRSfWrzO0YjqTJd5kjAq37Zep1CEgaYmrH9Q3GwPiB9cHyd1Y1UwggGhJGoxipbzg==",
+          "version": "15.0.1",
+          "resolved": "https://registry.npmjs.org/yargs-parser/-/yargs-parser-15.0.1.tgz",
+          "integrity": "sha512-0OAMV2mAZQrs3FkNpDQcBk1x5HXb8X4twADss4S0Iuk+2dGnLOE/fRHrsYm542GduMveyA77OF4wrNJuanRCWw==",
           "dev": true,
           "requires": {
             "camelcase": "^5.0.0",
diff --git a/package.json b/package.json
index d6aa25efd..c37cd6f6a 100644
--- a/package.json
+++ b/package.json
@@ -70,7 +70,7 @@
     "gulp-sourcemaps": "^2.6.5",
     "gulp-umd": "^2.0.0",
     "js-green-licenses": "^2.0.1",
-    "mocha": "^6.2.3",
+    "mocha": "^8.1.1",
     "rimraf": "^3.0.2",
     "selenium-standalone": "^6.17.0",
     "through2": "^4.0.2",
diff --git a/tests/mocha/.mocharc.js b/tests/mocha/.mocharc.js
new file mode 100644
index 000000000..3c156db3e
--- /dev/null
+++ b/tests/mocha/.mocharc.js
@@ -0,0 +1,7 @@
+'use strict';
+
+module.exports = {
+  ui: 'tdd',
+  file: '../blockly_uncompressed.js',
+  reporter: 'landing'
+};
diff --git a/tests/mocha/mocha.opts b/tests/mocha/mocha.opts
deleted file mode 100644
index b0986b141..000000000
--- a/tests/mocha/mocha.opts
+++ /dev/null
@@ -1,3 +0,0 @@
---ui tdd
---file ../blockly_uncompressed.js
---reporter landing
diff --git a/tests/node/.mocharc.js b/tests/node/.mocharc.js
new file mode 100644
index 000000000..0928b25d2
--- /dev/null
+++ b/tests/node/.mocharc.js
@@ -0,0 +1,6 @@
+'use strict';
+
+module.exports = {
+  ui: 'tdd',
+  reporter: 'landing'
+};
diff --git a/tests/node/mocha.opts b/tests/node/mocha.opts
deleted file mode 100644
index 240bd1610..000000000
--- a/tests/node/mocha.opts
+++ /dev/null
@@ -1,3 +0,0 @@
-# mocha.opts
---ui tdd
---reporter landing
diff --git a/tests/run_all_tests.sh b/tests/run_all_tests.sh
index f3513d699..57ffa26cb 100755
--- a/tests/run_all_tests.sh
+++ b/tests/run_all_tests.sh
@@ -56,7 +56,7 @@ run_test_command "eslint" "eslint ."
 run_test_command "mocha" "node tests/mocha/run_mocha_tests_in_browser.js"
 
 # Run Node tests.
-run_test_command "node" "./node_modules/.bin/mocha tests/node --opts tests/node/mocha.opts"
+run_test_command "node" "./node_modules/.bin/mocha tests/node --config tests/node/.mocharc.js"
 
 # Run generator tests inside a browser and check the results.
 run_test_command "generators" "tests/scripts/run_generators.sh"