diff --git a/CHANGELOG.md b/CHANGELOG.md
index 8d346e6..136d5fa 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,13 @@
 
 ## Unreleased
 
+### Features
+
+- Updater - Add `post-update-script` input parameter to run custom scripts after dependency updates ([#130](https://github.com/getsentry/github-workflows/pull/130))
+  - Scripts receive original and new version as arguments
+  - Support both bash (`.sh`) and PowerShell (`.ps1`) scripts
+  - Enables workflows like updating lock files, running code generators, or modifying configuration files
+
 ### Fixes
 
 - Updater - Fix boolean input handling for `changelog-entry` parameter and add input validation ([#127](https://github.com/getsentry/github-workflows/pull/127))
diff --git a/updater/README.md b/updater/README.md
index 633af21..a25f4e5 100644
--- a/updater/README.md
+++ b/updater/README.md
@@ -95,6 +95,18 @@ jobs:
           target-branch: v7
           pattern: '^1\.'  # Limit to major version '1'
           api-token: ${{ secrets.CI_DEPLOY_KEY }}
+
+  # Use a post-update script (sh or ps1) to make additional changes after dependency update
+  # The script receives two arguments: original version and new version
+  post-update-script:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: getsentry/github-workflows/updater@v3
+        with:
+          path: modules/sentry-cocoa
+          name: Cocoa SDK
+          post-update-script: scripts/post-update.sh  # Receives args: $1=old version, $2=new version
+          api-token: ${{ secrets.CI_DEPLOY_KEY }}
 ```
 
 ## Inputs
@@ -135,12 +147,45 @@ jobs:
   * type: string
   * required: false
   * default: '' (uses repository default branch)
+* `post-update-script`: Optional script to run after successful dependency update. Can be a bash script (`.sh`) or PowerShell script (`.ps1`). The script will be executed in the repository root directory before PR creation. The script receives two arguments:
+  * `$1` / `$args[0]` - The original version (version before update)
+  * `$2` / `$args[1]` - The new version (version after update)
+  * type: string
+  * required: false
+  * default: ''
 * `api-token`: Token for the repo. Can be passed in using `${{ secrets.GITHUB_TOKEN }}`.
   If you provide the usual `${{ github.token }}`, no followup CI will run on the created PR.
   If you want CI to run on the PRs created by the Updater, you need to provide custom user-specific auth token.
   * type: string
   * required: true
 
+### Post-Update Script Example
+
+**Bash script** (`scripts/post-update.sh`):
+
+```bash
+#!/usr/bin/env bash
+set -euo pipefail
+
+ORIGINAL_VERSION="$1"
+NEW_VERSION="$2"
+
+echo "Updated from $ORIGINAL_VERSION to $NEW_VERSION"
+# Make additional changes to repository files here
+```
+
+**PowerShell script** (`scripts/post-update.ps1`):
+
+```powershell
+param(
+    [Parameter(Mandatory = $true)][string] $OriginalVersion,
+    [Parameter(Mandatory = $true)][string] $NewVersion
+)
+
+Write-Output "Updated from $OriginalVersion to $NewVersion"
+# Make additional changes to repository files here
+```
+
 ## Outputs
 
 * `prUrl`: The created/updated PR's URL.
diff --git a/updater/action.yml b/updater/action.yml
index a21da6c..5349ec9 100644
--- a/updater/action.yml
+++ b/updater/action.yml
@@ -36,6 +36,10 @@ inputs:
   api-token:
     description: 'Token for the repo. Can be passed in using {{ secrets.GITHUB_TOKEN }}'
     required: true
+  post-update-script:
+    description: 'Optional script to run after successful dependency update. Can be a bash script (.sh) or PowerShell script (.ps1). The script will be executed in the caller-repo directory before PR creation.'
+    required: false
+    default: ''
 
 outputs:
   prUrl:
@@ -102,6 +106,17 @@ runs:
         }
         Write-Output "✓ PR strategy value '${{ inputs.pr-strategy }}' is valid"
 
+    - name: Validate post-update-script
+      if: ${{ inputs.post-update-script != '' }}
+      shell: pwsh
+      run: |
+        # Validate that inputs.post-update-script contains only safe characters
+        if ('${{ inputs.post-update-script }}' -notmatch '^[a-zA-Z0-9_\./#\s-]+$') {
+          Write-Output "::error::Invalid post-update-script path: '${{ inputs.post-update-script }}'. Only alphanumeric characters, spaces, and _-./#  are allowed."
+          exit 1
+        }
+        Write-Output "✓ Post-update script path '${{ inputs.post-update-script }}' is valid"
+
     # What we need to accomplish:
     # * update to the latest tag
     # * create a PR
@@ -134,8 +149,9 @@ runs:
         DEPENDENCY_PATH: ${{ inputs.path }}
         DEPENDENCY_PATTERN: ${{ inputs.pattern }}
         GH_TITLE_PATTERN: ${{ inputs.gh-title-pattern }}
+        POST_UPDATE_SCRIPT: ${{ inputs.post-update-script }}
         GH_TOKEN: ${{ inputs.api-token }}
-      run: ${{ github.action_path }}/scripts/update-dependency.ps1 -Path $env:DEPENDENCY_PATH -Pattern $env:DEPENDENCY_PATTERN -GhTitlePattern $env:GH_TITLE_PATTERN
+      run: ${{ github.action_path }}/scripts/update-dependency.ps1 -Path $env:DEPENDENCY_PATH -Pattern $env:DEPENDENCY_PATTERN -GhTitlePattern $env:GH_TITLE_PATTERN -PostUpdateScript $env:POST_UPDATE_SCRIPT
 
     - name: Get the base repo info
       if: steps.target.outputs.latestTag != steps.target.outputs.originalTag
@@ -270,8 +286,9 @@ runs:
       working-directory: caller-repo
       env:
         DEPENDENCY_PATH: ${{ inputs.path }}
+        POST_UPDATE_SCRIPT: ${{ inputs.post-update-script }}
         GH_TOKEN: ${{ inputs.api-token }}
-      run: ${{ github.action_path }}/scripts/update-dependency.ps1 -Path $env:DEPENDENCY_PATH -Tag '${{ steps.target.outputs.latestTag }}'
+      run: ${{ github.action_path }}/scripts/update-dependency.ps1 -Path $env:DEPENDENCY_PATH -Tag '${{ steps.target.outputs.latestTag }}' -PostUpdateScript $env:POST_UPDATE_SCRIPT
 
     - name: Update Changelog
       if: ${{ inputs.changelog-entry == 'true' && ( steps.target.outputs.latestTag != steps.target.outputs.originalTag ) && ( steps.root.outputs.changed == 'false') }}
diff --git a/updater/scripts/update-dependency.ps1 b/updater/scripts/update-dependency.ps1
index c825858..648a3a8 100644
--- a/updater/scripts/update-dependency.ps1
+++ b/updater/scripts/update-dependency.ps1
@@ -15,7 +15,10 @@ param(
     # RegEx pattern to match against GitHub release titles. Only releases with matching titles will be considered
     [string] $GhTitlePattern = '',
     # Specific version - if passed, no discovery is performed and the version is set directly
-    [string] $Tag = ''
+    [string] $Tag = '',
+    # Optional post-update script to run after successful dependency update
+    # The script receives the original and new version as arguments
+    [string] $PostUpdateScript = ''
 )
 
 $ErrorActionPreference = 'Stop'
@@ -249,6 +252,9 @@ if ("$Tag" -eq '') {
     $Tag = $latestTag
 }
 
+$originalTagForPostUpdate = if ($originalTag) { $originalTag } else { '' }
+$newTagForPostUpdate = $Tag
+
 if ($isSubmodule) {
     Write-Host "Updating submodule $Path to $Tag"
     Push-Location $Path
@@ -258,3 +264,25 @@ if ($isSubmodule) {
     Write-Host "Updating 'version' in $Path to $Tag"
     DependencyConfig 'set-version' $tag
 }
+
+# Run post-update script if provided
+if ("$PostUpdateScript" -ne '') {
+    Write-Host "Running post-update script: $PostUpdateScript"
+    if (-not (Test-Path $PostUpdateScript)) {
+        throw "Post-update script not found: $PostUpdateScript"
+    }
+
+    if (Get-Command 'chmod' -ErrorAction SilentlyContinue) {
+        chmod +x $PostUpdateScript
+        if ($LastExitCode -ne 0) {
+            throw 'chmod failed';
+        }
+    }
+
+    & $PostUpdateScript "$originalTag" "$tag"
+    if ($LastExitCode -ne 0) {
+        throw "Post-update script failed with exit code $LastExitCode"
+    }
+
+    Write-Host '✓ Post-update script completed successfully'
+}
diff --git a/updater/tests/update-dependency.Tests.ps1 b/updater/tests/update-dependency.Tests.ps1
index 6b77a42..0d92a02 100644
--- a/updater/tests/update-dependency.Tests.ps1
+++ b/updater/tests/update-dependency.Tests.ps1
@@ -1,9 +1,10 @@
 BeforeAll {
-    function UpdateDependency([Parameter(Mandatory = $true)][string] $path, [string] $pattern = $null, [string] $ghTitlePattern = $null)
+    function UpdateDependency([Parameter(Mandatory = $true)][string] $path, [string] $pattern = $null, [string] $ghTitlePattern = $null, [string] $postUpdateScript = $null)
     {
         $params = @{ Path = $path }
         if ($pattern) { $params.Pattern = $pattern }
         if ($ghTitlePattern) { $params.GhTitlePattern = $ghTitlePattern }
+        if ($postUpdateScript) { $params.PostUpdateScript = $postUpdateScript }
 
         $result = & "$PSScriptRoot/../scripts/update-dependency.ps1" @params
         if (-not $?)
@@ -488,4 +489,123 @@ FetchContent_Declare(
             $version | Should -Match '^8\.'
         }
     }
+
+    Context 'post-update-script' {
+        It 'runs PowerShell post-update script with version arguments' {
+            $testFile = "$testDir/test.properties"
+            $repo = 'https://github.com/getsentry/sentry-cli'
+            @("repo=$repo", 'version=0') | Out-File $testFile
+
+            $postUpdateScript = "$testDir/post-update-test.ps1"
+            $markerFile = "$testDir/post-update-marker.txt"
+            @'
+param([string] $originalVersion, [string] $newVersion)
+"$originalVersion|$newVersion" | Out-File
+'@ + " '$markerFile'" | Out-File $postUpdateScript
+
+            UpdateDependency $testFile '^0\.' -postUpdateScript $postUpdateScript
+
+            # Verify post-update script was executed
+            Test-Path $markerFile | Should -Be $true
+            $markerContent = Get-Content $markerFile
+            $markerContent | Should -Match '^0\|0\.28\.0$'
+
+            # Clean up
+            Remove-Item $markerFile -ErrorAction SilentlyContinue
+            Remove-Item $postUpdateScript -ErrorAction SilentlyContinue
+        }
+
+        It 'runs bash post-update script with version arguments' -Skip:$IsWindows {
+            $testFile = "$testDir/test.properties"
+            $repo = 'https://github.com/getsentry/sentry-cli'
+            @("repo=$repo", 'version=0') | Out-File $testFile
+
+            $postUpdateScript = "$testDir/post-update-test.sh"
+            $markerFile = "$testDir/post-update-marker.txt"
+            @"
+#!/usr/bin/env bash
+set -euo pipefail
+echo "`$1|`$2" > '$markerFile'
+"@ | Out-File $postUpdateScript
+
+            UpdateDependency $testFile '^0\.' -postUpdateScript $postUpdateScript
+
+            # Verify post-update script was executed
+            Test-Path $markerFile | Should -Be $true
+            $markerContent = Get-Content $markerFile
+            $markerContent | Should -Match '^0\|0\.28\.0$'
+
+            # Clean up
+            Remove-Item $markerFile -ErrorAction SilentlyContinue
+            Remove-Item $postUpdateScript -ErrorAction SilentlyContinue
+        }
+
+        It 'fails when post-update script does not exist' {
+            $testFile = "$testDir/test.properties"
+            $repo = 'https://github.com/getsentry/sentry-cli'
+            @("repo=$repo", 'version=0') | Out-File $testFile
+
+            $postUpdateScript = "$testDir/nonexistent-script.ps1"
+
+            { UpdateDependency $testFile '^0\.' -postUpdateScript $postUpdateScript } | Should -Throw '*Post-update script not found*'
+        }
+
+        It 'fails when PowerShell post-update script exits with error' {
+            $testFile = "$testDir/test.properties"
+            $repo = 'https://github.com/getsentry/sentry-cli'
+            @("repo=$repo", 'version=0') | Out-File $testFile
+
+            $postUpdateScript = "$testDir/failing-post-update.ps1"
+            @'
+param([string] $originalVersion, [string] $newVersion)
+throw "Post-update script failed intentionally"
+'@ | Out-File $postUpdateScript
+
+            { UpdateDependency $testFile '^0\.' -postUpdateScript $postUpdateScript } | Should -Throw '*Post-update script failed*'
+
+            # Clean up
+            Remove-Item $postUpdateScript -ErrorAction SilentlyContinue
+        }
+
+        It 'fails when bash post-update script exits with error' -Skip:$IsWindows {
+            $testFile = "$testDir/test.properties"
+            $repo = 'https://github.com/getsentry/sentry-cli'
+            @("repo=$repo", 'version=0') | Out-File $testFile
+
+            $postUpdateScript = "$testDir/failing-post-update.sh"
+            @'
+#!/usr/bin/env bash
+exit 1
+'@ | Out-File $postUpdateScript
+
+            { UpdateDependency $testFile '^0\.' -postUpdateScript $postUpdateScript } | Should -Throw '*Post-update script failed*'
+
+            # Clean up
+            Remove-Item $postUpdateScript -ErrorAction SilentlyContinue
+        }
+
+        It 'receives empty string for original version when updating from scratch' {
+            $testFile = "$testDir/test.properties"
+            $repo = 'https://github.com/getsentry/sentry-cli'
+            @("repo=$repo", 'version=') | Out-File $testFile
+
+            $postUpdateScript = "$testDir/post-update-empty-original.ps1"
+            $markerFile = "$testDir/post-update-marker-empty.txt"
+            @'
+param([string] $originalVersion, [string] $newVersion)
+"original=[$originalVersion]|new=[$newVersion]" | Out-File
+'@ + " '$markerFile'" | Out-File $postUpdateScript
+
+            UpdateDependency $testFile '^0\.' -postUpdateScript $postUpdateScript
+
+            # Verify post-update script received empty original version
+            Test-Path $markerFile | Should -Be $true
+            $markerContent = Get-Content $markerFile
+            $markerContent | Should -Match 'original=\[\]\|new=\[0\.28\.0\]'
+
+            # Clean up
+            Remove-Item $markerFile -ErrorAction SilentlyContinue
+            Remove-Item $postUpdateScript -ErrorAction SilentlyContinue
+        }
+    }
 }