diff --git a/package.json b/package.json
index 268aade96..00814eca6 100644
--- a/package.json
+++ b/package.json
@@ -128,7 +128,6 @@
     "rollup-plugin-terser": "7.0.2",
     "shelljs": "0.8.4",
     "snapshot-diff": "0.8.1",
-    "synchronous-promise": "2.0.15",
     "tempy": "1.0.1",
     "terser-webpack-plugin": "5.1.1",
     "webpack": "5.36.2"
diff --git a/src/cli/core.js b/src/cli/core.js
index 0beffc60c..2b9ca19ed 100644
--- a/src/cli/core.js
+++ b/src/cli/core.js
@@ -16,9 +16,9 @@ const {
 const { createDetailedUsage, createUsage } = require("./usage");
 const { createLogger } = require("./logger");
 
-function logResolvedConfigPathOrDie(context) {
+async function logResolvedConfigPathOrDie(context) {
   const file = context.argv["find-config-path"];
-  const configFile = prettier.resolveConfigFile.sync(file);
+  const configFile = await prettier.resolveConfigFile(file);
   if (configFile) {
     context.logger.log(path.relative(process.cwd(), configFile));
   } else {
@@ -26,7 +26,7 @@ function logResolvedConfigPathOrDie(context) {
   }
 }
 
-function logFileInfoOrDie(context) {
+async function logFileInfoOrDie(context) {
   const options = {
     ignorePath: context.argv["ignore-path"],
     withNodeModules: context.argv["with-node-modules"],
@@ -37,7 +37,7 @@ function logFileInfoOrDie(context) {
 
   context.logger.log(
     prettier.format(
-      stringify(prettier.getFileInfo.sync(context.argv["file-info"], options)),
+      stringify(await prettier.getFileInfo(context.argv["file-info"], options)),
       { parser: "json" }
     )
   );
diff --git a/src/cli/expand-patterns.js b/src/cli/expand-patterns.js
index b8f3bbc55..06edc1d60 100644
--- a/src/cli/expand-patterns.js
+++ b/src/cli/expand-patterns.js
@@ -10,12 +10,12 @@ const flat = require("lodash/flatten");
 /**
  * @param {Context} context
  */
-function* expandPatterns(context) {
+async function* expandPatterns(context) {
   const cwd = process.cwd();
   const seen = new Set();
   let noResults = true;
 
-  for (const pathOrError of expandPatternsInternal(context)) {
+  for await (const pathOrError of expandPatternsInternal(context)) {
     noResults = false;
     if (typeof pathOrError !== "string") {
       yield pathOrError;
@@ -44,7 +44,7 @@ function* expandPatterns(context) {
 /**
  * @param {Context} context
  */
-function* expandPatternsInternal(context) {
+async function* expandPatternsInternal(context) {
   // Ignores files in version control systems directories and `node_modules`
   const silentlyIgnoredDirs = [".git", ".svn", ".hg"];
   if (context.argv["with-node-modules"] !== true) {
@@ -102,7 +102,7 @@ function* expandPatternsInternal(context) {
     let result;
 
     try {
-      result = fastGlob.sync(glob, globOptions);
+      result = await fastGlob(glob, globOptions);
     } catch ({ message }) {
       /* istanbul ignore next */
       yield { error: `${errorMessages.globError[type]}: ${input}\n${message}` };
diff --git a/src/cli/format.js b/src/cli/format.js
index e9aef8ebb..88b42b83b 100644
--- a/src/cli/format.js
+++ b/src/cli/format.js
@@ -105,7 +105,7 @@ function listDifferent(context, input, options, filename) {
   return true;
 }
 
-function format(context, input, opt) {
+async function format(context, input, opt) {
   if (!opt.parser && !opt.filepath) {
     throw new errors.UndefinedParserError(
       "No parser and no file path given, couldn't infer a parser."
@@ -220,9 +220,9 @@ function format(context, input, opt) {
   return prettier.formatWithCursor(input, opt);
 }
 
-function createIgnorerFromContextOrDie(context) {
+async function createIgnorerFromContextOrDie(context) {
   try {
-    return createIgnorer.sync(
+    return await createIgnorer(
       context.argv["ignore-path"],
       context.argv["with-node-modules"]
     );
@@ -232,45 +232,45 @@ function createIgnorerFromContextOrDie(context) {
   }
 }
 
-function formatStdin(context) {
+async function formatStdin(context) {
   const filepath = context.argv["stdin-filepath"]
     ? path.resolve(process.cwd(), context.argv["stdin-filepath"])
     : process.cwd();
 
-  const ignorer = createIgnorerFromContextOrDie(context);
+  const ignorer = await createIgnorerFromContextOrDie(context);
   // If there's an ignore-path set, the filename must be relative to the
   // ignore path, not the current working directory.
   const relativeFilepath = context.argv["ignore-path"]
     ? path.relative(path.dirname(context.argv["ignore-path"]), filepath)
     : path.relative(process.cwd(), filepath);
 
-  getStdin()
-    .then((input) => {
-      if (
-        relativeFilepath &&
-        ignorer.ignores(fixWindowsSlashes(relativeFilepath))
-      ) {
-        writeOutput(context, { formatted: input });
-        return;
-      }
+  try {
+    const input = await getStdin();
 
-      const options = getOptionsForFile(context, filepath);
+    if (
+      relativeFilepath &&
+      ignorer.ignores(fixWindowsSlashes(relativeFilepath))
+    ) {
+      writeOutput(context, { formatted: input });
+      return;
+    }
 
-      if (listDifferent(context, input, options, "(stdin)")) {
-        return;
-      }
+    const options = await getOptionsForFile(context, filepath);
 
-      writeOutput(context, format(context, input, options), options);
-    })
-    .catch((error) => {
-      handleError(context, relativeFilepath || "stdin", error);
-    });
+    if (listDifferent(context, input, options, "(stdin)")) {
+      return;
+    }
+
+    writeOutput(context, await format(context, input, options), options);
+  } catch (error) {
+    handleError(context, relativeFilepath || "stdin", error);
+  }
 }
 
-function formatFiles(context) {
+async function formatFiles(context) {
   // The ignorer will be used to filter file paths after the glob is checked,
   // before any files are actually written
-  const ignorer = createIgnorerFromContextOrDie(context);
+  const ignorer = await createIgnorerFromContextOrDie(context);
 
   let numberOfUnformattedFilesFound = 0;
 
@@ -278,7 +278,7 @@ function formatFiles(context) {
     context.logger.log("Checking formatting...");
   }
 
-  for (const pathOrError of expandPatterns(context)) {
+  for await (const pathOrError of expandPatterns(context)) {
     if (typeof pathOrError === "object") {
       context.logger.error(pathOrError.error);
       // Don't exit, but set the exit code to 2
@@ -305,7 +305,7 @@ function formatFiles(context) {
     }
 
     const options = {
-      ...getOptionsForFile(context, filename),
+      ...(await getOptionsForFile(context, filename)),
       filepath: filename,
     };
 
@@ -349,7 +349,7 @@ function formatFiles(context) {
     let output;
 
     try {
-      result = format(context, input, options);
+      result = await format(context, input, options);
       output = result.formatted;
     } catch (error) {
       handleError(context, filename, error, printedFilename);
diff --git a/src/cli/index.js b/src/cli/index.js
index 7ea19bd3a..38f105f7c 100644
--- a/src/cli/index.js
+++ b/src/cli/index.js
@@ -22,14 +22,14 @@ async function run(rawArguments) {
       logger = core.createLogger(logLevel);
     }
 
-    main(rawArguments, logger);
+    await main(rawArguments, logger);
   } catch (error) {
     logger.error(error.message);
     process.exitCode = 1;
   }
 }
 
-function main(rawArguments, logger) {
+async function main(rawArguments, logger) {
   const context = new core.Context({ rawArguments, logger });
 
   logger.debug(`normalized argv: ${JSON.stringify(context.argv)}`);
@@ -79,13 +79,13 @@ function main(rawArguments, logger) {
     (!process.stdin.isTTY || context.argv["stdin-filepath"]);
 
   if (context.argv["find-config-path"]) {
-    core.logResolvedConfigPathOrDie(context);
+    await core.logResolvedConfigPathOrDie(context);
   } else if (context.argv["file-info"]) {
-    core.logFileInfoOrDie(context);
+    await core.logFileInfoOrDie(context);
   } else if (useStdin) {
-    core.formatStdin(context);
+    await core.formatStdin(context);
   } else if (hasFilePatterns) {
-    core.formatFiles(context);
+    await core.formatFiles(context);
   } else {
     logger.log(core.createUsage(context));
     process.exitCode = 1;
diff --git a/src/cli/option.js b/src/cli/option.js
index bb5db7aa5..1d6ce15f8 100644
--- a/src/cli/option.js
+++ b/src/cli/option.js
@@ -59,7 +59,7 @@ function parseArgsToOptions(context, overrideDefaults) {
   );
 }
 
-function getOptionsOrDie(context, filePath) {
+async function getOptionsOrDie(context, filePath) {
   try {
     if (context.argv.config === false) {
       context.logger.debug(
@@ -74,7 +74,7 @@ function getOptionsOrDie(context, filePath) {
         : `resolve config from '${filePath}'`
     );
 
-    const options = prettier.resolveConfig.sync(filePath, {
+    const options = await prettier.resolveConfig(filePath, {
       editorconfig: context.argv.editorconfig,
       config: context.argv.config,
     });
@@ -108,8 +108,8 @@ function applyConfigPrecedence(context, options) {
   }
 }
 
-function getOptionsForFile(context, filepath) {
-  const options = getOptionsOrDie(context, filepath);
+async function getOptionsForFile(context, filepath) {
+  const options = await getOptionsOrDie(context, filepath);
 
   const hasPlugins = options && options.plugins;
   if (hasPlugins) {
diff --git a/tests/integration/runPrettier.js b/tests/integration/runPrettier.js
index d8edb2773..e1ba2eb66 100644
--- a/tests/integration/runPrettier.js
+++ b/tests/integration/runPrettier.js
@@ -3,7 +3,6 @@
 const fs = require("fs");
 const path = require("path");
 const stripAnsi = require("strip-ansi");
-const { SynchronousPromise } = require("synchronous-promise");
 const { prettierCli, thirdParty } = require("./env");
 
 async function run(dir, args, options) {
@@ -74,7 +73,7 @@ async function run(dir, args, options) {
   // "get-stream" module to mock.
   jest
     .spyOn(require(thirdParty), "getStdin")
-    .mockImplementation(() => SynchronousPromise.resolve(options.input || ""));
+    .mockImplementation(() => Promise.resolve(options.input || ""));
   jest
     .spyOn(require(thirdParty), "isCI")
     .mockImplementation(() => Boolean(options.ci));
diff --git a/yarn.lock b/yarn.lock
index e22c1c009..6b6001512 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -6648,11 +6648,6 @@ symbol-tree@^3.2.4:
   resolved "https://registry.yarnpkg.com/symbol-tree/-/symbol-tree-3.2.4.tgz#430637d248ba77e078883951fb9aa0eed7c63fa2"
   integrity sha512-9QNk5KwDF+Bvz+PyObkmSYjI5ksVUYtjW7AU22r2NKcfLJcXp96hkDWU3+XndOsUb+AQ9QhfzfCT2O+CNWT5Tw==
 
-synchronous-promise@2.0.15:
-  version "2.0.15"
-  resolved "https://registry.yarnpkg.com/synchronous-promise/-/synchronous-promise-2.0.15.tgz#07ca1822b9de0001f5ff73595f3d08c4f720eb8e"
-  integrity sha512-k8uzYIkIVwmT+TcglpdN50pS2y1BDcUnBPK9iJeGu0Pl1lOI8pD6wtzgw91Pjpe+RxtTncw32tLxs/R0yNL2Mg==
-
 table@^6.0.4:
   version "6.0.7"
   resolved "https://registry.yarnpkg.com/table/-/table-6.0.7.tgz#e45897ffbcc1bcf9e8a87bf420f2c9e5a7a52a34"