diff --git a/.github/workflows/post-release.yml b/.github/workflows/post-release.yml
index 162e17f10a5..6f26e1058a3 100644
--- a/.github/workflows/post-release.yml
+++ b/.github/workflows/post-release.yml
@@ -21,13 +21,7 @@ jobs:
     needs:
     - automation
 
-    if: |
-      needs.automation.outputs.enabled
-      &&
-      (
-        (github.ref_type == 'tag' && startsWith(github.ref_name, 'core-') && !contains(github.ref_name, '-alpha') && !contains(github.ref_name, '-beta') && !contains(github.ref_name, '-rc'))
-        || (inputs.tag && startsWith(inputs.tag, 'core-') && !contains(inputs.tag, '-alpha') && !contains(inputs.tag, '-beta') && !contains(inputs.tag, '-rc'))
-      )
+    if: needs.automation.outputs.enabled
 
     env:
       GH_TOKEN: ${{ secrets[needs.automation.outputs.token-secret-name] }}
@@ -35,10 +29,16 @@ jobs:
     steps:
     - uses: actions/checkout@v4
       with:
+        # Note: By default GitHub only fetches 1 commit. We need all the tags
+        # for this work.
+        fetch-depth: 0
         ref: ${{ github.event.repository.default_branch }}
         token: ${{ secrets[needs.automation.outputs.token-secret-name] }}
 
     - name: Create GitHub Pull Request to update stable build version in props
+      if: |
+          (github.ref_type == 'tag' && startsWith(github.ref_name, 'core-') && !contains(github.ref_name, '-alpha') && !contains(github.ref_name, '-beta') && !contains(github.ref_name, '-rc'))
+          || (inputs.tag && startsWith(inputs.tag, 'core-') && !contains(inputs.tag, '-alpha') && !contains(inputs.tag, '-beta') && !contains(inputs.tag, '-rc'))
       shell: pwsh
       run: |
         Import-Module .\build\scripts\post-release.psm1
@@ -49,3 +49,23 @@ jobs:
           -targetBranch '${{ github.event.repository.default_branch }}' `
           -gitUserName '${{ needs.automation.outputs.username }}' `
           -gitUserEmail '${{ needs.automation.outputs.email }}'
+
+    - name: Invoke core version update workflow in opentelemetry-dotnet-contrib repository
+      if: vars.CONTRIB_REPO
+      shell: pwsh
+      run: |
+        Import-Module .\build\scripts\post-release.psm1
+
+        InvokeCoreVersionUpdateWorkflowInRemoteRepository `
+          -remoteGitRepository '${{ vars.CONTRIB_REPO }}' `
+          -tag '${{ inputs.tag || github.ref_name }}'
+
+    - name: Post notice when release is published
+      shell: pwsh
+      run: |
+        Import-Module .\build\scripts\post-release.psm1
+
+        TryPostReleasePublishedNoticeOnPrepareReleasePullRequest `
+          -gitRepository '${{ github.repository }}' `
+          -botUserName '${{ needs.automation.outputs.username }}' `
+          -tag '${{ inputs.tag || github.ref_name }}'
diff --git a/build/RELEASING.md b/build/RELEASING.md
index 035aad38d6b..d25f13b1355 100644
--- a/build/RELEASING.md
+++ b/build/RELEASING.md
@@ -164,18 +164,21 @@
     workflow creates a draft release for the tag which was pushed. Edit the
     draft Release and click `Publish release`.
 
-14. If a new stable version of the core packages was released, a draft PR should
-    have been automatically created by the [Build, pack, and publish to
-    MyGet](https://github.com/open-telemetry/opentelemetry-dotnet/actions/workflows/publish-packages-1.0.yml)
+14. If a new stable version of the core packages was released, a PR should have
+    been automatically created by the [Complete
+    release](https://github.com/open-telemetry/opentelemetry-dotnet/actions/workflows/post-release.yml)
     workflow to update the `OTelLatestStableVer` property in
-    `Directory.Packages.props` to the just released stable version. Mark that PR
-    `Ready for review` and then merge it once the build passes (this requires
-    the packages be available on NuGet).
-
-15. If a new stable version of the core packages was released, open an issue in
-    the
-    [opentelemetry-dotnet-contrib](https://github.com/open-telemetry/opentelemetry-dotnet-contrib)
-    repo to notify maintainers to begin upgrading dependencies.
+    `Directory.Packages.props` to the just released stable version. Merge that
+    PR once the build passes (this requires the packages be available on NuGet).
+
+15. The [Complete
+    release](https://github.com/open-telemetry/opentelemetry-dotnet/actions/workflows/post-release.yml)
+    workflow should have invoked the [Core version
+    update](https://github.com/open-telemetry/opentelemetry-dotnet-contrib/actions/workflows/core-version-update.yml)
+    workflow on the
+    [opentelemetry-dotnet-contrib](https://github.com/open-telemetry/opentelemetry-dotnet-contrib/)
+    repository which opens a PR to update dependencies. Verify this PR was
+    opened successfully.
 
 16. Post an announcement in the [Slack
     channel](https://cloud-native.slack.com/archives/C01N3BC2W7Q). Note any big
diff --git a/build/scripts/post-release.psm1 b/build/scripts/post-release.psm1
index 369d4366fb3..ca6ea1cc158 100644
--- a/build/scripts/post-release.psm1
+++ b/build/scripts/post-release.psm1
@@ -136,8 +136,6 @@ function TryPostPackagesReadyNoticeOnPrepareReleasePullRequest {
   $body =
 @"
 The packages for [$tag](https://github.com/$gitRepository/releases/tag/$tag) are now available: $packagesUrl.
-
-Have a nice day!
 "@
 
     $pullRequestNumber = $pr.number
@@ -227,3 +225,85 @@ Merge once packages are available on NuGet and the build passes.
 }
 
 Export-ModuleMember -Function CreateStableVersionUpdatePullRequest
+
+function InvokeCoreVersionUpdateWorkflowInRemoteRepository {
+  param(
+    [Parameter(Mandatory=$true)][string]$remoteGitRepository,
+    [Parameter(Mandatory=$true)][string]$tag,
+    [Parameter()][string]$targetBranch="main"
+  )
+
+  $match = [regex]::Match($tag, '^(.*?-)(.*)$')
+  if ($match.Success -eq $false)
+  {
+      throw 'Could not parse prefix or version from tag'
+  }
+
+  gh workflow run "core-version-update.yml" `
+    --repo $remoteGitRepository `
+    --ref $targetBranch `
+    --field "tag=$tag"
+}
+
+Export-ModuleMember -Function InvokeCoreVersionUpdateWorkflowInRemoteRepository
+
+function TryPostReleasePublishedNoticeOnPrepareReleasePullRequest {
+  param(
+    [Parameter(Mandatory=$true)][string]$gitRepository,
+    [Parameter(Mandatory=$true)][string]$botUserName,
+    [Parameter(Mandatory=$true)][string]$tag
+  )
+
+  $tagSha = git rev-list -n 1 $tag 2>&1 | % ToString
+  if ($LASTEXITCODE -gt 0)
+  {
+      throw 'git rev-list failure'
+  }
+
+  $prListResponse = gh pr list --search $tagSha --state merged --json number,author,title,comments | ConvertFrom-Json
+
+  if ($prListResponse.Length -eq 0)
+  {
+    Write-Host 'No prepare release PR found for tag & commit skipping post notice'
+    return
+  }
+
+  foreach ($pr in $prListResponse)
+  {
+    if ($pr.author.login -ne $botUserName -or $pr.title -ne "[repo] Prepare release $tag")
+    {
+      continue
+    }
+
+    $foundComment = $false
+    foreach ($comment in $pr.comments)
+    {
+      if ($comment.author.login -eq $botUserName -and $comment.body.StartsWith("The packages for [$tag](https://github.com/$gitRepository/releases/tag/$tag) are now available:"))
+      {
+        $foundComment = $true
+        break
+      }
+    }
+
+    if ($foundComment -eq $false)
+    {
+      continue
+    }
+
+  $body =
+@"
+The release [$tag](https://github.com/$gitRepository/releases/tag/$tag) has been published and packages should be available on NuGet momentarily.
+
+Have a nice day!
+"@
+
+    $pullRequestNumber = $pr.number
+
+    gh pr comment $pullRequestNumber --body $body
+    return
+  }
+
+  Write-Host 'No prepare release PR found matched author and title with a valid comment'
+}
+
+Export-ModuleMember -Function TryPostReleasePublishedNoticeOnPrepareReleasePullRequest