diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 5622e4b..6ac2417 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -44,4 +44,4 @@ jobs:
           key: v2-${{ hashFiles('repositories.json') }}
       - uses: actions/setup-node@v6
       - run: yarn
-      - run: yarn execute "RUN https://pkg.pr.new/prettier/prettier@main VS latest"
+      - run: yarn execute "RUN https://pkg.pr.new/prettier/prettier@main VS https://pkg.pr.new/prettier/prettier@main"
diff --git a/src/execute-command.ts b/src/execute-command.ts
index 38fab4f..afec375 100644
--- a/src/execute-command.ts
+++ b/src/execute-command.ts
@@ -13,14 +13,16 @@ export type ExecuteCommandResult = Awaited<ReturnType<typeof executeCommand>>;
 
 export async function executeCommand(commandString: string) {
   const { alternative, original, repositories } = parseCommand(commandString);
+  const isSame = alternative.raw === original.raw;
+
   const directory = await createTemporaryDirectory();
 
   // Install Prettier
-  const [alternativePrettier, originalPrettier] = await Promise.all(
-    [original, alternative].map((version) =>
-      installPrettier(version, { cwd: directory }),
-    ),
+  const promises = [installPrettier(alternative, { cwd: directory })];
+  promises.push(
+    isSame ? promises[0] : installPrettier(original, { cwd: directory }),
   );
+  const [alternativePrettier, originalPrettier] = await Promise.all(promises);
 
   await logger.brief(
     `Running Prettier on ${repositories.length} repositories ...`,
diff --git a/src/run-prettier.ts b/src/run-prettier.ts
index 0996c00..01ffa2f 100644
--- a/src/run-prettier.ts
+++ b/src/run-prettier.ts
@@ -95,6 +95,11 @@ export async function runPrettier(
     reset,
   });
 
+  if (alternative === original) {
+    timing.end();
+    return "";
+  }
+
   await runPrettierWithVersion({
     cwd: directory,
     prettier: alternative,