diff --git a/CHANGELOG.md b/CHANGELOG.md
index b61960887..77e350d80 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,7 +2,11 @@
 
 ## 7.1.3
 
-Added Clear-VSTeamDefaultProjectCount and Set-VSTeamDefaultProjectCount to control the default number of projects returned for tab completion and validation. By default only 100 projects are returned and the 100 returned is nondeterministic. But calling Set-VSTeamDefaultProjectCount you can increase the number of projects returned.
+Merged [Pull Request](https://github.com/DarqueWarrior/vsteam/pull/350) from [Daniel Silva](https://github.com/DanielSSilva) which included the following:
+
+- Fixed exception thrown by the Update-VSTeamPullRequest when status is set to "completed", by adding the missing "lastMergeSourceCommit" property to body.
+
+Also added Clear-VSTeamDefaultProjectCount and Set-VSTeamDefaultProjectCount to control the default number of projects returned for tab completion and validation. By default only 100 projects are returned and the 100 returned is nondeterministic. But calling Set-VSTeamDefaultProjectCount you can increase the number of projects returned.
 
 ## 7.1.2
 
diff --git a/Source/Public/Update-VSTeamPullRequest.ps1 b/Source/Public/Update-VSTeamPullRequest.ps1
index 1d4de06ff..e23c27e96 100644
--- a/Source/Public/Update-VSTeamPullRequest.ps1
+++ b/Source/Public/Update-VSTeamPullRequest.ps1
@@ -1,6 +1,6 @@
 function Update-VSTeamPullRequest {
    [CmdletBinding(SupportsShouldProcess = $true, ConfirmImpact = "High", DefaultParameterSetName = 'Draft',
-    HelpUri='https://methodsandpractices.github.io/vsteam-docs/docs/modules/vsteam/commands/Update-VSTeamPullRequest')]
+      HelpUri = 'https://methodsandpractices.github.io/vsteam-docs/docs/modules/vsteam/commands/Update-VSTeamPullRequest')]
    param(
       [Parameter(ValueFromPipelineByPropertyName = $true, Mandatory = $true, Position = 0)]
       [Alias('Id')]
@@ -46,7 +46,13 @@ function Update-VSTeamPullRequest {
          }
 
          if ($Status) {
-            $body = '{"status": "' + $Status + '"}'
+            if ($Status -eq "completed") {
+               $lastMergeSourceCommit = Get-VSTeamPullRequest -RepositoryId $RepositoryId | Where-Object { $_.pullRequestId -eq $PullRequestId } | Select-Object -ExpandProperty lastMergeSourceCommit | ConvertTo-Json
+               $body = '{"status": "' + $Status + '", "lastMergeSourceCommit": ' + $lastMergeSourceCommit + '}'
+            }
+            else {
+               $body = '{"status": "' + $Status + '"}'
+            }
          }
 
          # Call the REST API
diff --git a/Source/VSTeam.psd1 b/Source/VSTeam.psd1
index d960375bf..3a7f064ce 100644
--- a/Source/VSTeam.psd1
+++ b/Source/VSTeam.psd1
@@ -12,7 +12,7 @@
    RootModule           = 'VSTeam.psm1'
 
    # Version number of this module.
-   ModuleVersion        = '7.1.2'
+   ModuleVersion        = '7.1.3'
 
    # Supported PSEditions
    CompatiblePSEditions = @('Core', 'Desktop')
diff --git a/Tests/function/tests/Update-VSTeamPullRequest.Tests.ps1 b/Tests/function/tests/Update-VSTeamPullRequest.Tests.ps1
index 7593ccb80..bc13723f0 100644
--- a/Tests/function/tests/Update-VSTeamPullRequest.Tests.ps1
+++ b/Tests/function/tests/Update-VSTeamPullRequest.Tests.ps1
@@ -3,15 +3,17 @@ Set-StrictMode -Version Latest
 Describe 'VSTeamPullRequest' {
    BeforeAll {
       . "$PSScriptRoot\_testInitialize.ps1" $PSCommandPath
+      . "$baseFolder/Source/Public/Get-VSTeamPullRequest.ps1"
       . "$baseFolder/Source/Public/Get-VSTeamUser.ps1"
 
       Mock _getInstance { return 'https://dev.azure.com/test' }
       Mock _getApiVersion { return '1.0-unitTest' } -ParameterFilter {
-         $Service -eq 'Git' -or 
+         $Service -eq 'Git' -or
          $Service -eq 'Graph'
       }
 
       Mock Invoke-RestMethod { Open-SampleFile 'users.single.json' }
+      Mock Get-VSTeamPullRequest { Open-SampleFile 'Get-VSTeamPullRequest-Id_17.json' }
       Mock Invoke-RestMethod { Open-SampleFile 'updatePullRequestResponse.json' } -ParameterFilter {
          $PullRequestId -eq 18000
       }
@@ -57,6 +59,20 @@ Describe 'VSTeamPullRequest' {
          }
       }
 
+      It 'Update-VSTeamPullRequest to set status to completed' {
+         ## Act
+         Update-VSTeamPullRequest -RepositoryId "45df2d67-e709-4557-a7f9-c6812b449277" -PullRequestId 17 -Status completed -Force
+
+         ## Assert
+         Should -Invoke Invoke-RestMethod -Exactly -Scope It -Times 1 -ParameterFilter {
+            $Method -eq 'Patch' -and
+            $Uri -like "*repositories/45df2d67-e709-4557-a7f9-c6812b449277/*" -and
+            $Uri -like "*pullrequests/17*" -and
+            $Body -like '*"status": "completed"*' -and
+            $Body -like '*"commitId":*"c8262543095d0d443b5bcaff27201ef01314d4ff"*'
+         }
+      }
+
       It 'Update-VSTeamPullRequest to set to enable auto complete' {
          ## Arrange
          $user = Get-VSTeamUser -Descriptor "aad.OTcyOTJkNzYtMjc3Yi03OTgxLWIzNDMtNTkzYmM3ODZkYjlj"
diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index cab3ac481..516fb7dab 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -9,7 +9,7 @@ resources:
 variables:
   Folder: 'dist'
   TEAM_CIBUILD: 'true'
-  PESTER_VERSION: '5.0.2'
+  PESTER_VERSION: '5.1.1'
 
 stages:
 - stage: Build