diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 05cfa398..52c25914 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -82,7 +82,6 @@ jobs:
       - name: Verify Changed files
         uses: tj-actions/verify-changed-files@v16
         id: changed_files
-        if: github.event_name == 'pull_request'
         with:
           files: |
             src
diff --git a/action.yml b/action.yml
index 5b377f8f..20baebb2 100644
--- a/action.yml
+++ b/action.yml
@@ -136,6 +136,10 @@ inputs:
     description: "Skip the initial fetch to improve performance for shallow repositories. **NOTE**: This could lead to errors with missing history and the intended use is limited to when you've fetched the history necessary to perform the diff."
     required: false
     default: "false"
+  fetch_additional_submodule_history:
+    description: "Fetch additional history for submodules."
+    required: false
+    default: "false"
   since_last_remote_commit:
     description: "Use the last commit on the remote branch as the `base_sha`. Defaults to the last non-merge commit on the target branch for pull request events and the previous remote commit of the current branch for push events."
     required: false
diff --git a/dist/index.js b/dist/index.js
index dce749cb..074cfce2 100644
Binary files a/dist/index.js and b/dist/index.js differ
diff --git a/dist/index.js.map b/dist/index.js.map
index 553948dd..425ad4f7 100644
Binary files a/dist/index.js.map and b/dist/index.js.map differ
diff --git a/src/changedFiles.ts b/src/changedFiles.ts
index 99313e65..33c702b3 100644
--- a/src/changedFiles.ts
+++ b/src/changedFiles.ts
@@ -65,6 +65,9 @@ export const getRenamedFiles = async ({
             diff
           }))
         ) {
+          core.warning(
+            `Set 'fetch_additional_submodule_history: true' to fetch additional submodule history for: ${submodulePath}, Note you can control the fetch depth using 'fetch_depth' input`
+          )
           diff = '..'
         }
 
@@ -157,6 +160,9 @@ export const getAllDiffFiles = async ({
             diff
           }))
         ) {
+          core.warning(
+            `Set 'fetch_additional_submodule_history: true' to fetch additional submodule history for: ${submodulePath}, Note you can control the fetch depth using 'fetch_depth' input`
+          )
           diff = '..'
         }
 
diff --git a/src/commitSha.ts b/src/commitSha.ts
index 6605b9d4..eedacd57 100644
--- a/src/commitSha.ts
+++ b/src/commitSha.ts
@@ -93,56 +93,70 @@ export const getSHAForNonPullRequestEvent = async (
   const currentBranch = targetBranch
   let initialCommit = false
 
-  if (isShallow && !inputs.skipInitialFetch) {
-    core.info('Repository is shallow, fetching more history...')
+  if (!inputs.skipInitialFetch) {
+    if (isShallow) {
+      core.info('Repository is shallow, fetching more history...')
 
-    if (isTag) {
-      let sourceBranch = ''
+      if (isTag) {
+        let sourceBranch = ''
 
-      if (github.context.payload.base_ref) {
-        sourceBranch = github.context.payload.base_ref.replace(
-          'refs/heads/',
-          ''
-        )
-      } else if (github.context.payload.release?.target_commitish) {
-        sourceBranch = github.context.payload.release?.target_commitish
+        if (github.context.payload.base_ref) {
+          sourceBranch = github.context.payload.base_ref.replace(
+            'refs/heads/',
+            ''
+          )
+        } else if (github.context.payload.release?.target_commitish) {
+          sourceBranch = github.context.payload.release?.target_commitish
+        }
+
+        await gitFetch({
+          cwd: workingDirectory,
+          args: [
+            ...gitFetchExtraArgs,
+            '-u',
+            '--progress',
+            `--deepen=${inputs.fetchDepth}`,
+            'origin',
+            `+refs/heads/${sourceBranch}:refs/remotes/origin/${sourceBranch}`
+          ]
+        })
+      } else {
+        await gitFetch({
+          cwd: workingDirectory,
+          args: [
+            ...gitFetchExtraArgs,
+            '-u',
+            '--progress',
+            `--deepen=${inputs.fetchDepth}`,
+            'origin',
+            `+refs/heads/${targetBranch}:refs/remotes/origin/${targetBranch}`
+          ]
+        })
       }
 
-      await gitFetch({
-        cwd: workingDirectory,
-        args: [
-          ...gitFetchExtraArgs,
-          '-u',
-          '--progress',
-          `--deepen=${inputs.fetchDepth}`,
-          'origin',
-          `+refs/heads/${sourceBranch}:refs/remotes/origin/${sourceBranch}`
-        ]
-      })
+      if (hasSubmodule) {
+        await gitFetchSubmodules({
+          cwd: workingDirectory,
+          args: [
+            ...gitFetchExtraArgs,
+            '-u',
+            '--progress',
+            `--deepen=${inputs.fetchDepth}`
+          ]
+        })
+      }
     } else {
-      await gitFetch({
-        cwd: workingDirectory,
-        args: [
-          ...gitFetchExtraArgs,
-          '-u',
-          '--progress',
-          `--deepen=${inputs.fetchDepth}`,
-          'origin',
-          `+refs/heads/${targetBranch}:refs/remotes/origin/${targetBranch}`
-        ]
-      })
-    }
-
-    if (hasSubmodule) {
-      await gitFetchSubmodules({
-        cwd: workingDirectory,
-        args: [
-          ...gitFetchExtraArgs,
-          '-u',
-          '--progress',
-          `--deepen=${inputs.fetchDepth}`
-        ]
-      })
+      if (hasSubmodule && inputs.fetchSubmoduleHistory) {
+        await gitFetchSubmodules({
+          cwd: workingDirectory,
+          args: [
+            ...gitFetchExtraArgs,
+            '-u',
+            '--progress',
+            `--deepen=${inputs.fetchDepth}`
+          ]
+        })
+      }
     }
   }
 
@@ -288,55 +302,68 @@ export const getSHAForPullRequestEvent = async (
     targetBranch = currentBranch
   }
 
-  if (isShallow && !inputs.skipInitialFetch) {
+  if (!inputs.skipInitialFetch) {
     core.info('Repository is shallow, fetching more history...')
-
-    let prFetchExitCode = await gitFetch({
-      cwd: workingDirectory,
-      args: [
-        ...gitFetchExtraArgs,
-        '-u',
-        '--progress',
-        'origin',
-        `pull/${github.context.payload.pull_request?.number}/head:${currentBranch}`
-      ]
-    })
-
-    if (prFetchExitCode !== 0) {
-      prFetchExitCode = await gitFetch({
+    if (isShallow) {
+      let prFetchExitCode = await gitFetch({
         cwd: workingDirectory,
         args: [
           ...gitFetchExtraArgs,
           '-u',
           '--progress',
-          `--deepen=${inputs.fetchDepth}`,
           'origin',
-          `+refs/heads/${currentBranch}*:refs/remotes/origin/${currentBranch}*`
-        ]
-      })
-    }
-
-    if (prFetchExitCode !== 0) {
-      throw new Error(
-        'Failed to fetch pull request branch. Please ensure "persist-credentials" is set to "true" when checking out the repository. See: https://github.com/actions/checkout#usage'
-      )
-    }
-
-    if (!inputs.sinceLastRemoteCommit) {
-      core.debug('Fetching target branch...')
-      await gitFetch({
-        cwd: workingDirectory,
-        args: [
-          ...gitFetchExtraArgs,
-          '-u',
-          '--progress',
-          `--deepen=${inputs.fetchDepth}`,
-          'origin',
-          `+refs/heads/${targetBranch}:refs/remotes/origin/${targetBranch}`
+          `pull/${github.context.payload.pull_request?.number}/head:${currentBranch}`
         ]
       })
 
-      if (hasSubmodule) {
+      if (prFetchExitCode !== 0) {
+        prFetchExitCode = await gitFetch({
+          cwd: workingDirectory,
+          args: [
+            ...gitFetchExtraArgs,
+            '-u',
+            '--progress',
+            `--deepen=${inputs.fetchDepth}`,
+            'origin',
+            `+refs/heads/${currentBranch}*:refs/remotes/origin/${currentBranch}*`
+          ]
+        })
+      }
+
+      if (prFetchExitCode !== 0) {
+        throw new Error(
+          'Failed to fetch pull request branch. Please ensure "persist-credentials" is set to "true" when checking out the repository. See: https://github.com/actions/checkout#usage'
+        )
+      }
+
+      if (!inputs.sinceLastRemoteCommit) {
+        core.debug('Fetching target branch...')
+        await gitFetch({
+          cwd: workingDirectory,
+          args: [
+            ...gitFetchExtraArgs,
+            '-u',
+            '--progress',
+            `--deepen=${inputs.fetchDepth}`,
+            'origin',
+            `+refs/heads/${targetBranch}:refs/remotes/origin/${targetBranch}`
+          ]
+        })
+
+        if (hasSubmodule) {
+          await gitFetchSubmodules({
+            cwd: workingDirectory,
+            args: [
+              ...gitFetchExtraArgs,
+              '-u',
+              '--progress',
+              `--deepen=${inputs.fetchDepth}`
+            ]
+          })
+        }
+      }
+    } else {
+      if (hasSubmodule && inputs.fetchSubmoduleHistory) {
         await gitFetchSubmodules({
           cwd: workingDirectory,
           args: [
diff --git a/src/inputs.ts b/src/inputs.ts
index 2b88afc3..a92041db 100644
--- a/src/inputs.ts
+++ b/src/inputs.ts
@@ -34,6 +34,7 @@ export type Inputs = {
   json: boolean
   escapeJson: boolean
   fetchDepth?: number
+  fetchSubmoduleHistory?: boolean
   sinceLastRemoteCommit: boolean
   writeOutputFiles: boolean
   outputDir: string
@@ -189,6 +190,12 @@ export const getInputs = (): Inputs => {
   const skipInitialFetch = core.getBooleanInput('skip_initial_fetch', {
     required: false
   })
+  const fetchSubmoduleHistory = core.getBooleanInput(
+    'fetch_additional_submodule_history',
+    {
+      required: false
+    }
+  )
 
   const inputs: Inputs = {
     files,
@@ -225,6 +232,7 @@ export const getInputs = (): Inputs => {
     oldNewSeparator,
     oldNewFilesSeparator,
     skipInitialFetch,
+    fetchSubmoduleHistory,
     // End Not Supported via REST API
     dirNames,
     dirNamesExcludeCurrentDir,
diff --git a/src/main.ts b/src/main.ts
index 43fcd1e0..2f8024a6 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -317,7 +317,8 @@ export async function run(): Promise<void> {
       'recoverFiles',
       'recoverFilesIgnore',
       'includeAllOldNewRenamedFiles',
-      'skipInitialFetch'
+      'skipInitialFetch',
+      'fetchSubmoduleHistory'
     ]
 
     for (const input of unsupportedInputs) {