diff --git a/.circleci/config.yml b/.circleci/config.yml
index 866276dd4c816..a9905a53b7a9f 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -127,19 +127,22 @@ jobs:
     environment: *environment
     steps:
       - checkout
+      - run: yarn workspaces info | head -n -1 > workspace_info.txt
+      - *restore_node_modules
       - run:
           name: Download artifacts for base revision
-          # TODO: We can't use the normal download-build script here because it
-          # depends on the CircleCI artifacts API, which was recently changed to
-          # require authorization. And we can't pass an authorization token
-          # without possibly leaking it to the public, since we run sizebot on
-          # PRs from external contributors. As a temporary workaround, this job
-          # will pull the artifacts from a public mirror that I set up. But we
-          # should find some other solution so we don't have to maintain
-          # the mirror.
           command: |
-            curl -L --retry 60 --retry-delay 10 --retry-max-time 600 https://react-builds.vercel.app/api/commits/$(git merge-base HEAD origin/main)/artifacts/build.tgz | tar -xz
-            mv ./build ./base-build
+              git fetch origin main
+              cd ./scripts/release && yarn && cd ../../
+              scripts/release/download-experimental-build.js --commit=$(git merge-base HEAD origin/main)
+              mv ./build ./base-build
+      - run:
+          # TODO: The `download-experimental-build` script copies the npm
+          # packages into the `node_modules` directory. This is a historical
+          # quirk of how the release script works. Let's pretend they
+          # don't exist.
+          name: Delete extraneous files
+          command: rm -rf ./base-build/node_modules
 
       - persist_to_workspace:
           root: .
diff --git a/scripts/release/shared-commands/download-build-artifacts.js b/scripts/release/shared-commands/download-build-artifacts.js
index 4765f41ca6515..fba7465202739 100644
--- a/scripts/release/shared-commands/download-build-artifacts.js
+++ b/scripts/release/shared-commands/download-build-artifacts.js
@@ -9,14 +9,6 @@ const {getArtifactsList, logPromise} = require('../utils');
 const theme = require('../theme');
 
 const run = async ({build, cwd, releaseChannel}) => {
-  const CIRCLE_TOKEN = process.env.CIRCLE_CI_API_TOKEN;
-  if (!CIRCLE_TOKEN) {
-    console.error(
-      theme.error('Missing required environment variable: CIRCLE_CI_API_TOKEN')
-    );
-    process.exit(1);
-  }
-
   const artifacts = await getArtifactsList(build);
   const buildArtifacts = artifacts.find(entry =>
     entry.path.endsWith('build.tgz')
@@ -32,7 +24,7 @@ const run = async ({build, cwd, releaseChannel}) => {
   // Download and extract artifact
   await exec(`rm -rf ./build`, {cwd});
   await exec(
-    `curl -L $(fwdproxy-config curl) ${buildArtifacts.url} -H "Circle-Token: ${CIRCLE_TOKEN}" | tar -xvz`,
+    `curl -L $(fwdproxy-config curl) ${buildArtifacts.url} | tar -xvz`,
     {
       cwd,
     }