diff --git a/packages/cli/src/commands/__tests__/type-check.test.js b/packages/cli/src/commands/__tests__/type-check.test.js
index 0eb9923463..15729a189a 100644
--- a/packages/cli/src/commands/__tests__/type-check.test.js
+++ b/packages/cli/src/commands/__tests__/type-check.test.js
@@ -43,12 +43,6 @@ vi.mock('../../lib', async (importOriginal) => {
   }
 })
 
-vi.mock('../../commands/upgrade', () => {
-  return {
-    getCmdMajorVersion: () => 3,
-  }
-})
-
 import path from 'path'
 
 import concurrently from 'concurrently'
@@ -83,12 +77,12 @@ test('Should run tsc commands correctly, in order', async () => {
   // Ensure tsc command run correctly for web side
   expect(concurrentlyArgs.commands).toContainEqual({
     cwd: path.join('myBasePath', 'web'),
-    command: 'yarn  tsc --noEmit --skipLibCheck',
+    command: 'yarn tsc --noEmit --skipLibCheck',
   })
   // Ensure tsc command run correctly for web side
   expect(concurrentlyArgs.commands).toContainEqual({
     cwd: path.join('myBasePath', 'api'),
-    command: 'yarn  tsc --noEmit --skipLibCheck',
+    command: 'yarn tsc --noEmit --skipLibCheck',
   })
   // Ensure we have raw sequential output from tsc
   expect(concurrentlyArgs.options).toEqual({ group: true, raw: true })
@@ -108,8 +102,9 @@ test('Should generate prisma client', async () => {
   // Ensure tsc command run correctly for web side
   expect(concurrentlyArgs.commands).toContainEqual({
     cwd: path.join('myBasePath', 'api'),
-    command: 'yarn  tsc --noEmit --skipLibCheck',
+    command: 'yarn tsc --noEmit --skipLibCheck',
   })
+
   expect(runCommandTask.mock.results[0].value[0]).toMatch(
     /.+(\\|\/)prisma(\\|\/)build(\\|\/)index.js.+/,
   )
diff --git a/packages/cli/src/commands/setup/ui/libraries/tailwindcssHandler.js b/packages/cli/src/commands/setup/ui/libraries/tailwindcssHandler.js
index bc14906e58..7b7d61e5b1 100644
--- a/packages/cli/src/commands/setup/ui/libraries/tailwindcssHandler.js
+++ b/packages/cli/src/commands/setup/ui/libraries/tailwindcssHandler.js
@@ -116,20 +116,9 @@ export const handler = async ({ force, install }) => {
               {
                 title: `Install ${projectPackages.join(', ')}`,
                 task: async () => {
-                  const yarnVersion = await execa('yarn', ['--version'])
-                  const isYarnV1 = yarnVersion.stdout.trim().startsWith('1')
-                  await execa(
-                    'yarn',
-                    [
-                      'add',
-                      '-D',
-                      ...(isYarnV1 ? ['-W'] : []),
-                      ...projectPackages,
-                    ],
-                    {
-                      cwd: rwPaths.base,
-                    },
-                  )
+                  await execa('yarn', ['add', '-D', ...projectPackages], {
+                    cwd: rwPaths.base,
+                  })
                 },
               },
             ],
diff --git a/packages/cli/src/commands/type-checkHandler.js b/packages/cli/src/commands/type-checkHandler.js
index 7757fd94c5..0eb59b79a8 100644
--- a/packages/cli/src/commands/type-checkHandler.js
+++ b/packages/cli/src/commands/type-checkHandler.js
@@ -6,7 +6,6 @@ import { Listr } from 'listr2'
 
 import { recordTelemetryAttributes } from '@cedarjs/cli-helpers'
 
-import { getCmdMajorVersion } from '../commands/upgrade.js'
 import { generatePrismaClient } from '../lib/generatePrismaClient.js'
 import { getPaths } from '../lib/index.js'
 
@@ -22,21 +21,14 @@ export const handler = async ({ sides, verbose, prisma, generate }) => {
   /**
    * Check types for the project directory : [web, api]
    */
-
   const typeCheck = async () => {
     let conclusiveExitCode = 0
 
-    const yarnVersion = await getCmdMajorVersion('yarn')
-
     const tscForAllSides = sides.map((side) => {
       const projectDir = path.join(getPaths().base, side)
-      // -s flag to suppress error output from yarn. For example yarn doc link on non-zero status.
-      // Since it'll be printed anyways after the whole execution.
       return {
         cwd: projectDir,
-        command: `yarn ${
-          yarnVersion > 1 ? '' : '-s'
-        } tsc --noEmit --skipLibCheck`,
+        command: `yarn tsc --noEmit --skipLibCheck`,
       }
     })
 
@@ -63,6 +55,7 @@ export const handler = async ({ sides, verbose, prisma, generate }) => {
       schema: getPaths().api.dbSchema,
     })
   }
+
   if (generate) {
     await new Listr(
       [
diff --git a/packages/cli/src/commands/upgrade.js b/packages/cli/src/commands/upgrade.js
index 844b351e19..750cf19ca2 100644
--- a/packages/cli/src/commands/upgrade.js
+++ b/packages/cli/src/commands/upgrade.js
@@ -235,19 +235,12 @@ export const handler = async ({ dryRun, tag, verbose, dedupe, yes }) => {
   await tasks.run()
 }
 async function yarnInstall({ verbose }) {
-  const yarnVersion = await getCmdMajorVersion('yarn')
-
   try {
-    await execa(
-      'yarn install',
-      yarnVersion > 1 ? [] : ['--force', '--non-interactive'],
-      {
-        shell: true,
-        stdio: verbose ? 'inherit' : 'pipe',
-
-        cwd: getPaths().base,
-      },
-    )
+    await execa('yarn install', {
+      shell: true,
+      stdio: verbose ? 'inherit' : 'pipe',
+      cwd: getPaths().base,
+    })
   } catch (e) {
     throw new Error(
       'Could not finish installation. Please run `yarn install` and then `yarn dedupe`, before continuing',
@@ -515,41 +508,13 @@ async function refreshPrismaClient(task, { verbose }) {
   }
 }
 
-export const getCmdMajorVersion = async (command) => {
-  // Get current version
-  const { stdout } = await execa(command, ['--version'], {
-    cwd: getPaths().base,
-  })
-
-  if (!SEMVER_REGEX.test(stdout)) {
-    throw new Error(`Unable to verify ${command} version.`)
-  }
-
-  // Get major version number
-  const version = stdout.match(SEMVER_REGEX)[0]
-  return parseInt(version.split('.')[0])
-}
-
 const dedupeDeps = async (task, { verbose }) => {
   try {
-    const yarnVersion = await getCmdMajorVersion('yarn')
-
-    const baseExecaArgsForDedupe = {
+    await execa('yarn dedupe', {
       shell: true,
       stdio: verbose ? 'inherit' : 'pipe',
       cwd: getPaths().base,
-    }
-    if (yarnVersion > 1) {
-      await execa('yarn', ['dedupe'], baseExecaArgsForDedupe)
-    } else {
-      // CedarJS projects should not be using yarn 1.x as we specify a version of yarn in the package.json
-      // with "packageManager": "yarn@4.6.0" or similar.
-      // Although we could (and previous did) automatically run `npx yarn-deduplicate` here, that would require
-      // the user to have `npx` installed, which is not guaranteed and we do not wish to enforce that.
-      task.skip(
-        "Yarn 1.x doesn't support dedupe directly. Please upgrade yarn or use npx with `npx yarn-deduplicate` manually.",
-      )
-    }
+    })
   } catch (e) {
     console.log(c.error(e.message))
     throw new Error(
diff --git a/packages/cli/src/lib/index.js b/packages/cli/src/lib/index.js
index b1866ba29c..9b325f99b5 100644
--- a/packages/cli/src/lib/index.js
+++ b/packages/cli/src/lib/index.js
@@ -1,4 +1,3 @@
-import { execSync } from 'child_process'
 import https from 'https'
 import path from 'path'
 
@@ -532,18 +531,11 @@ export const addPackagesTask = async ({
       ].filter(Boolean),
     ]
   } else {
-    const stdout = execSync('yarn --version')
-
-    const yarnVersion = stdout.toString().trim()
-
     installCommand = [
       'yarn',
-      [
-        yarnVersion.startsWith('1') && '-W',
-        'add',
-        devDependency && '--dev',
-        ...packagesWithSameRWVersion,
-      ].filter(Boolean),
+      ['add', devDependency && '--dev', ...packagesWithSameRWVersion].filter(
+        Boolean,
+      ),
     ]
   }