diff --git a/packages/gatsby-legacy-polyfills/package.json b/packages/gatsby-legacy-polyfills/package.json
index 9799f71764899..6c659fbbb7421 100644
--- a/packages/gatsby-legacy-polyfills/package.json
+++ b/packages/gatsby-legacy-polyfills/package.json
@@ -31,7 +31,7 @@
     "dist/"
   ],
   "devDependencies": {
-    "@jridgewell/trace-mapping": "^0.3.13",
+    "@jridgewell/trace-mapping": "^0.3.14",
     "chokidar-cli": "^3.0.0",
     "codegen.macro": "^4.1.0",
     "core-js": "3.9.0",
@@ -40,7 +40,7 @@
     "event-target-polyfill": "^0.0.3",
     "execa": "^5.1.1",
     "fs-extra": "^10.1.0",
-    "microbundle": "^0.14.2",
+    "microbundle": "^0.15.0",
     "npm-run-all": "^4.1.5",
     "object-assign": "^4.1.1",
     "url-polyfill": "^1.1.12",
diff --git a/yarn.lock b/yarn.lock
index 2a502718b8121..cc18715c4a01a 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2671,10 +2671,10 @@
   resolved "https://registry.yarnpkg.com/@jridgewell/sourcemap-codec/-/sourcemap-codec-1.4.11.tgz#771a1d8d744eeb71b6adb35808e1a6c7b9b8c8ec"
   integrity sha512-Fg32GrJo61m+VqYSdRSjRXMjQ06j8YIYfcTqndLYVAaHmroZHLJZCydsWBOTDqXS2v+mjxohBWEMfg97GXmYQg==
 
-"@jridgewell/trace-mapping@^0.3.0", "@jridgewell/trace-mapping@^0.3.13", "@jridgewell/trace-mapping@^0.3.8", "@jridgewell/trace-mapping@^0.3.9":
-  version "0.3.13"
-  resolved "https://registry.yarnpkg.com/@jridgewell/trace-mapping/-/trace-mapping-0.3.13.tgz#dcfe3e95f224c8fe97a87a5235defec999aa92ea"
-  integrity sha512-o1xbKhp9qnIAoHJSWd6KlCZfqslL4valSF81H8ImioOAxluWYWOpWkpyktY2vnt4tbrX9XYaxovq6cgowaJp2w==
+"@jridgewell/trace-mapping@^0.3.0", "@jridgewell/trace-mapping@^0.3.13", "@jridgewell/trace-mapping@^0.3.14", "@jridgewell/trace-mapping@^0.3.8", "@jridgewell/trace-mapping@^0.3.9":
+  version "0.3.14"
+  resolved "https://registry.yarnpkg.com/@jridgewell/trace-mapping/-/trace-mapping-0.3.14.tgz#b231a081d8f66796e475ad588a1ef473112701ed"
+  integrity sha512-bJWEfQ9lPTvm3SneWwRFVLzrh6nhjwqw7TUFFBEMzwvg7t7PCDenf2lDwqo4NQXzdpgBXyFgDWnQA+2vkruksQ==
   dependencies:
     "@jridgewell/resolve-uri" "^3.0.3"
     "@jridgewell/sourcemap-codec" "^1.4.10"
@@ -16629,6 +16629,54 @@ microbundle@^0.14.2:
     tslib "^2.0.3"
     typescript "^4.1.3"
 
+microbundle@^0.15.0:
+  version "0.15.0"
+  resolved "https://registry.yarnpkg.com/microbundle/-/microbundle-0.15.0.tgz#d5a63ce02271b20d79fd30d83a123aaf962a5191"
+  integrity sha512-EkFst5ntLXoQGewkvga/Kd72RcN7IuJRl5ivLihJSbvLfJQo8LDS0n9X0q81vegiC59vhtKIM6qjrl1fOAtuGw==
+  dependencies:
+    "@babel/core" "^7.12.10"
+    "@babel/plugin-proposal-class-properties" "7.12.1"
+    "@babel/plugin-syntax-import-meta" "^7.10.4"
+    "@babel/plugin-syntax-jsx" "^7.12.1"
+    "@babel/plugin-transform-flow-strip-types" "^7.12.10"
+    "@babel/plugin-transform-react-jsx" "^7.12.11"
+    "@babel/plugin-transform-regenerator" "^7.12.1"
+    "@babel/preset-env" "^7.12.11"
+    "@babel/preset-flow" "^7.12.1"
+    "@babel/preset-react" "^7.12.10"
+    "@rollup/plugin-alias" "^3.1.1"
+    "@rollup/plugin-babel" "^5.2.2"
+    "@rollup/plugin-commonjs" "^17.0.0"
+    "@rollup/plugin-json" "^4.1.0"
+    "@rollup/plugin-node-resolve" "^11.0.1"
+    "@surma/rollup-plugin-off-main-thread" "^2.2.2"
+    asyncro "^3.0.0"
+    autoprefixer "^10.1.0"
+    babel-plugin-macros "^3.0.1"
+    babel-plugin-transform-async-to-promises "^0.8.15"
+    babel-plugin-transform-replace-expressions "^0.2.0"
+    brotli-size "^4.0.0"
+    builtin-modules "^3.1.0"
+    camelcase "^6.2.0"
+    escape-string-regexp "^4.0.0"
+    filesize "^6.1.0"
+    gzip-size "^6.0.0"
+    kleur "^4.1.3"
+    lodash.merge "^4.6.2"
+    postcss "^8.2.1"
+    pretty-bytes "^5.4.1"
+    rollup "^2.35.1"
+    rollup-plugin-bundle-size "^1.0.3"
+    rollup-plugin-postcss "^4.0.0"
+    rollup-plugin-terser "^7.0.2"
+    rollup-plugin-typescript2 "^0.29.0"
+    rollup-plugin-visualizer "^5.6.0"
+    sade "^1.7.4"
+    terser "^5.7.0"
+    tiny-glob "^0.2.8"
+    tslib "^2.0.3"
+    typescript "^4.1.3"
+
 micromark-extension-footnote@^0.3.0:
   version "0.3.2"
   resolved "https://registry.yarnpkg.com/micromark-extension-footnote/-/micromark-extension-footnote-0.3.2.tgz#129b74ef4920ce96719b2c06102ee7abb2b88a20"
@@ -17112,10 +17160,10 @@ nan@^2.10.0, nan@^2.14.2:
   resolved "https://registry.yarnpkg.com/nan/-/nan-2.14.2.tgz#f5376400695168f4cc694ac9393d0c9585eeea19"
   integrity sha512-M2ufzIiINKCuDfBSAUr1vWQ+vuVcA9kqx8JJUsbQi6yf1uGRyb7HfpdfUr5qLXf3B/t8dPvcjhKMmlfnP47EzQ==
 
-nanoid@^3.1.30:
-  version "3.1.30"
-  resolved "https://registry.yarnpkg.com/nanoid/-/nanoid-3.1.30.tgz#63f93cc548d2a113dc5dfbc63bfa09e2b9b64362"
-  integrity sha512-zJpuPDwOv8D2zq2WRoMe1HsfZthVewpel9CAvTfc/2mBD1uUT/agc5f7GHGWXlYkFvi1mVxe4IjvP2HNrop7nQ==
+nanoid@^3.1.30, nanoid@^3.1.32:
+  version "3.3.4"
+  resolved "https://registry.yarnpkg.com/nanoid/-/nanoid-3.3.4.tgz#730b67e3cd09e2deacf03c027c81c9d9dbc5e8ab"
+  integrity sha512-MqBkQh/OHTS2egovRtLk45wEyNXwF+cokD+1YPf9u5VfJiRdAiRwB2froX5Co9Rh20xs4siNPm8naNotSD6RBw==
 
 nanomatch@^1.2.9:
   version "1.2.13"
@@ -21972,6 +22020,16 @@ rollup-plugin-virtual@^1.0.1:
   resolved "https://registry.yarnpkg.com/rollup-plugin-virtual/-/rollup-plugin-virtual-1.0.1.tgz#8227c94c605b981adfe433ea74de3551e42ffeb4"
   integrity sha512-HCTBpV8MwP5lNzZrHD2moVxHIToHU1EkzkKGVj6Z0DcgUfxrxrZmeQirQeLz2yhnkJqRjwiVywK9CS8jDYakrw==
 
+rollup-plugin-visualizer@^5.6.0:
+  version "5.6.0"
+  resolved "https://registry.yarnpkg.com/rollup-plugin-visualizer/-/rollup-plugin-visualizer-5.6.0.tgz#06aa7cf3fd504a29d404335700f2a3f28ebb33f3"
+  integrity sha512-CKcc8GTUZjC+LsMytU8ocRr/cGZIfMR7+mdy4YnlyetlmIl/dM8BMnOEpD4JPIGt+ZVW7Db9ZtSsbgyeBH3uTA==
+  dependencies:
+    nanoid "^3.1.32"
+    open "^8.4.0"
+    source-map "^0.7.3"
+    yargs "^17.3.1"
+
 rollup-pluginutils@^2.8.2:
   version "2.8.2"
   resolved "https://registry.yarnpkg.com/rollup-pluginutils/-/rollup-pluginutils-2.8.2.tgz#72f2af0748b592364dbd3389e600e5a9444a351e"