diff --git a/appveyor.yml b/appveyor.yml
index 2b74d36a..4fd1bcee 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -110,6 +110,7 @@ deploy:
 
 on_success:
   - ps: scripts\appveyor\delete_old_artifacts.ps1
+  - ps: scripts\appveyor\update_masterlist_branches.ps1
 
 on_finish:
   - ps: (New-Object System.Net.WebClient).UploadFile("https://ci.appveyor.com/api/testresults/junit/$($env:APPVEYOR_JOB_ID)", "$($env:APPVEYOR_BUILD_FOLDER)\build\$($env:CONFIGURATION)\tests.xml")
diff --git a/scripts/appveyor/update_masterlist_branches.ps1 b/scripts/appveyor/update_masterlist_branches.ps1
new file mode 100644
index 00000000..66820ea2
--- /dev/null
+++ b/scripts/appveyor/update_masterlist_branches.ps1
@@ -0,0 +1,23 @@
+function Get-BranchName() {
+  $numbers = $env:APPVEYOR_REPO_TAG_NAME.Split('.')
+
+  if ($numbers[0] -eq 0) {
+    $numbers = $numbers[0..($numbers.length - 2)]
+  } else {
+    $numbers = @($numbers[0])
+  }
+
+  return "v" + ($numbers -join '.')
+}
+
+if ($env:APPVEYOR_REPO_TAG -eq 'true') {
+  npm install -g lomad
+  $branchName = Get-BranchName
+
+  Write-Output "`nUpdating masterlists' default branch to $branchName..."
+  lomad -t $env:access_token -a -d $branchName
+
+  if ($lastexitcode -eq 0) {
+    Write-Output "Masterlists' default branches have been updated."
+  }
+}