diff --git a/README.md b/README.md
index e4888ae..3ba42cd 100644
--- a/README.md
+++ b/README.md
@@ -27,17 +27,6 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-      # Perform a minimal checkout to set up this repository for the rest of the
-      # workflow.
-      #
-      # This step must be configured exactly as below: using different
-      # actions/checkout arguments is not supported.
-      - name: Checkout this repository
-        uses: actions/checkout@v4
-        with:
-          filter: tree:0
-
-      # Run the estimation tool
       - name: Run sizeup
         # TODO: Replace the version below with your desired version.
         uses: lerebear/sizeup-action@v0.4.2
diff --git a/badges/coverage.svg b/badges/coverage.svg
index d179b1d..24cd63a 100644
--- a/badges/coverage.svg
+++ b/badges/coverage.svg
@@ -1 +1 @@
-<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="116" height="20" role="img" aria-label="Coverage: 63.23%"><title>Coverage: 63.23%</title><linearGradient id="s" x2="0" y2="100%"><stop offset="0" stop-color="#bbb" stop-opacity=".1"/><stop offset="1" stop-opacity=".1"/></linearGradient><clipPath id="r"><rect width="116" height="20" rx="3" fill="#fff"/></clipPath><g clip-path="url(#r)"><rect width="63" height="20" fill="#555"/><rect x="63" width="53" height="20" fill="#e05d44"/><rect width="116" height="20" fill="url(#s)"/></g><g fill="#fff" text-anchor="middle" font-family="Verdana,Geneva,DejaVu Sans,sans-serif" text-rendering="geometricPrecision" font-size="110"><text aria-hidden="true" x="325" y="150" fill="#010101" fill-opacity=".3" transform="scale(.1)" textLength="530">Coverage</text><text x="325" y="140" transform="scale(.1)" fill="#fff" textLength="530">Coverage</text><text aria-hidden="true" x="885" y="150" fill="#010101" fill-opacity=".3" transform="scale(.1)" textLength="430">63.23%</text><text x="885" y="140" transform="scale(.1)" fill="#fff" textLength="430">63.23%</text></g></svg>
\ No newline at end of file
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" width="116" height="20" role="img" aria-label="Coverage: 61.87%"><title>Coverage: 61.87%</title><linearGradient id="s" x2="0" y2="100%"><stop offset="0" stop-color="#bbb" stop-opacity=".1"/><stop offset="1" stop-opacity=".1"/></linearGradient><clipPath id="r"><rect width="116" height="20" rx="3" fill="#fff"/></clipPath><g clip-path="url(#r)"><rect width="63" height="20" fill="#555"/><rect x="63" width="53" height="20" fill="#e05d44"/><rect width="116" height="20" fill="url(#s)"/></g><g fill="#fff" text-anchor="middle" font-family="Verdana,Geneva,DejaVu Sans,sans-serif" text-rendering="geometricPrecision" font-size="110"><text aria-hidden="true" x="325" y="150" fill="#010101" fill-opacity=".3" transform="scale(.1)" textLength="530">Coverage</text><text x="325" y="140" transform="scale(.1)" fill="#fff" textLength="530">Coverage</text><text aria-hidden="true" x="885" y="150" fill="#010101" fill-opacity=".3" transform="scale(.1)" textLength="430">61.87%</text><text x="885" y="140" transform="scale(.1)" fill="#fff" textLength="430">61.87%</text></g></svg>
\ No newline at end of file
diff --git a/dist/index.js b/dist/index.js
index 8cef7fe..d372d6d 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -16402,27 +16402,17 @@ exports.pullRequestAuthorHasNotOptedIn = pullRequestAuthorHasNotOptedIn;
  */
 async function fetchDiff(pull) {
     const git = (0, simple_git_1.simpleGit)('.', { trimmed: true });
-    // let baseRefExists = false
-    // try {
-    //   baseRefExists = !!(await git.raw('rev-parse', '--verify', pull.base.ref))
-    // } catch (e) {
-    //   core.error(
-    //     `Error from 'git rev-parse --verfy ${pull.base.ref}': ${
-    //       (e as Error).message
-    //     }`
-    //   )
-    // }
-    // if (!baseRefExists) {
-    //   core.setFailed(
-    //     `Could not find pull request base branch ${pull.base.ref}. ` +
-    //       `Please make sure actions/checkout was used beforehand to fetch ${pull.base.ref}.`
-    //   )
-    //   return
-    // }
-    core.debug(`Fetching base ref "${pull.base.ref}" and head ref "${pull.head.ref}"`);
+    core.debug(`Cloning just the base ref "${pull.base.ref}"`);
+    const cloneUrl = `https://${core.getInput('token')}@github.com/${github.context.repo.owner}/${github.context.repo.repo}`;
+    await git.clone(cloneUrl, '.', [
+        `--branch=${pull.base.ref}`,
+        '--filter=tree:0',
+        '--no-tags',
+        '--single-branch'
+    ]);
+    core.debug(`Fetching head ref "${pull.head.ref}"`);
     await git.fetch([
         'origin',
-        `+${pull.base.ref}:${pull.base.ref}`,
         `+${pull.head.ref}:${pull.head.ref}`,
         `--filter=tree:0`,
         '--no-tags',
diff --git a/src/initializer.ts b/src/initializer.ts
index c4eb934..5880cb6 100644
--- a/src/initializer.ts
+++ b/src/initializer.ts
@@ -72,32 +72,20 @@ export async function fetchDiff(
 ): Promise<string | undefined> {
   const git = simpleGit('.', { trimmed: true })
 
-  // let baseRefExists = false
-  // try {
-  //   baseRefExists = !!(await git.raw('rev-parse', '--verify', pull.base.ref))
-  // } catch (e) {
-  //   core.error(
-  //     `Error from 'git rev-parse --verfy ${pull.base.ref}': ${
-  //       (e as Error).message
-  //     }`
-  //   )
-  // }
-
-  // if (!baseRefExists) {
-  //   core.setFailed(
-  //     `Could not find pull request base branch ${pull.base.ref}. ` +
-  //       `Please make sure actions/checkout was used beforehand to fetch ${pull.base.ref}.`
-  //   )
-  //   return
-  // }
-
-  core.debug(
-    `Fetching base ref "${pull.base.ref}" and head ref "${pull.head.ref}"`
-  )
+  core.debug(`Cloning just the base ref "${pull.base.ref}"`)
+  const cloneUrl = `https://${core.getInput('token')}@github.com/${
+    github.context.repo.owner
+  }/${github.context.repo.repo}`
+  await git.clone(cloneUrl, '.', [
+    `--branch=${pull.base.ref}`,
+    '--filter=tree:0',
+    '--no-tags',
+    '--single-branch'
+  ])
 
+  core.debug(`Fetching head ref "${pull.head.ref}"`)
   await git.fetch([
     'origin',
-    `+${pull.base.ref}:${pull.base.ref}`,
     `+${pull.head.ref}:${pull.head.ref}`,
     `--filter=tree:0`,
     '--no-tags',