diff --git a/CHANGELOG.md b/CHANGELOG.md
index c2a357dd..4e0c7555 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,6 +6,7 @@
 
 ## Changed
 - Changed from Ace editor to Monaco editor.
+- Updated hub firmware to [v3.1.0a2].
 
 ### Fixed
 - Fixed run button still enabled after hub disconnects during download [support#378].
@@ -36,6 +37,7 @@ Prerelease changes are documented at [support#48].
 [support#378]: https://github.com/pybricks/support/issues/378
 [v3.0.0]: https://github.com/pybricks/pybricks-micropython/blob/master/CHANGELOG.md#300---2021-06-08
 [v3.1.0a1]: https://github.com/pybricks/pybricks-micropython/blob/master/CHANGELOG.md#310a1---2021-06-23
+[v3.1.0a2]: https://github.com/pybricks/pybricks-micropython/blob/master/CHANGELOG.md#310a2---2021-07-06
 
 [Unreleased]: https://github.com/pybricks/pybricks-code/compare/v1.1.0-beta.1...HEAD
 [1.1.0-beta.1]: https://github.com/pybricks/pybricks-code/compare/v1.0.0...v1.1.0-beta.1
diff --git a/package.json b/package.json
index 4787190a..0dd5a614 100644
--- a/package.json
+++ b/package.json
@@ -10,7 +10,7 @@
     "dependencies": {
         "@blueprintjs/core": "^3.41.0",
         "@craco/craco": "^6.1.1",
-        "@pybricks/firmware": "4.13.0-alpha.1",
+        "@pybricks/firmware": "4.13.0-alpha.2",
         "@pybricks/ide-docs": "1.5.0",
         "@pybricks/mpy-cross-v5": "^2.0.0",
         "@shopify/react-i18n": "^6.0.4",
diff --git a/yarn.lock b/yarn.lock
index f8178f04..2a8a6297 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -1563,10 +1563,10 @@
     schema-utils "^2.6.5"
     source-map "^0.7.3"
 
-"@pybricks/firmware@4.13.0-alpha.1":
-  version "4.13.0-alpha.1"
-  resolved "https://registry.yarnpkg.com/@pybricks/firmware/-/firmware-4.13.0-alpha.1.tgz#431efc24960c0966444b78982cdbba9cfc9505af"
-  integrity sha512-fxHu9eA48rU1LtHdGQpCguNxhsBqBozevLYZnunCWz2LrOH3ULleJwKf3iN+yv8d4w1J0e/QU35da6G+MUWDOw==
+"@pybricks/firmware@4.13.0-alpha.2":
+  version "4.13.0-alpha.2"
+  resolved "https://registry.yarnpkg.com/@pybricks/firmware/-/firmware-4.13.0-alpha.2.tgz#59a4ff349cc5e92ceddc50227757b121e90e071e"
+  integrity sha512-H0jAouX4Jnbah6Hgp8sD/vsPq8Nk2eMEFV+8lYwOJlqwNGeb9+WP1Hsk+hBiYj5tj7JnCwuDEVtCMm59zVYjGg==
   dependencies:
     jszip "^3.5.0"