diff --git a/Build/localbuild.ps1 b/Build/localbuild.ps1
new file mode 100644
index 00000000..58a6510c
--- /dev/null
+++ b/Build/localbuild.ps1
@@ -0,0 +1,5 @@
+Start-Transcript ($PSScriptRoot + '\Temp\runbuild.txt')
+
+$version = Get-Content "$PSScriptRoot\version.json" | Out-String | ConvertFrom-Json
+
+& $PSScriptRoot\runbuild.ps1 -properties @{"majorVersion"="$($version.Major).0"; "majorWithReleaseVersion"="$($version.Major).0.$($version.Release)"; "nugetPrerelease"=$version.Prerelease; "zipFileName"="Json$($version.Major)0r$($version.Release).zip"; "treatWarningsAsErrors"=$true}
\ No newline at end of file
diff --git a/Build/version.json b/Build/version.json
new file mode 100644
index 00000000..3d72af29
--- /dev/null
+++ b/Build/version.json
@@ -0,0 +1,5 @@
+{
+  "Major": 12,
+  "Release": 1,
+  "Prerelease": "beta1"
+}
\ No newline at end of file
diff --git a/azure-pipelines.yml b/azure-pipelines.yml
index 14498ee4..7c5b6e06 100644
--- a/azure-pipelines.yml
+++ b/azure-pipelines.yml
@@ -10,20 +10,22 @@ steps:
   env:
     KEY_DATA: $(newtonsoft.keyData)
   displayName: 'Prepare signing key'
-  condition: and(succeeded(), eq(variables['Build.SourceBranch'], 'refs/heads/master'))
+  condition: and(succeeded(), not(eq(variables['build.reason'], 'PullRequest')))
 
 - powershell: |
-    $buildNumber = [int]$Env:BUILD_ID
-    write-host "Build number $buildNumber" -fore white
     $basePath = resolve-path .
     $keyPath = "$basePath\key.snk"
     $sign = test-path $keyPath
     write-host "Sign assemblies $sign" -fore white
-    $formattedBuildNumber = $buildNumber.ToString("D6")
-    $nugetPrerelease = "build$formattedBuildNumber"
-    .\Build\runbuild.ps1 -properties @{"signAssemblies"=$sign; "signKeyPath"=$keyPath; "treatWarningsAsErrors"=$true; "nugetPrerelease"=$nugetPrerelease;}
+    $version = Get-Content .\Build\version.json | Out-String | ConvertFrom-Json
+    $buildNumber = [int]$Env:BuildId
+    write-host "Build number $buildNumber" -fore white
+    $nugetPrerelease = if ($Env:SourceBranch -eq "refs/heads/master") { $version.Prerelease } else { "build$($buildNumber.ToString("D6"))" }
+    write-host "Prerelease $nugetPrerelease" -fore white
+    .\Build\runbuild.ps1 -properties @{"majorVersion"="$($version.Major).0"; "majorWithReleaseVersion"="$($version.Major).0.$($version.Release)"; "nugetPrerelease"=$nugetPrerelease; "zipFileName"="Json$($version.Major)0r$($version.Release).zip"; "signAssemblies"=$sign; "signKeyPath"=$keyPath; "treatWarningsAsErrors"=$true; "buildNuGet"=$true}
   env:
-    BUILD_ID: $(Build.BuildId)
+    BuildId: $(Build.BuildId)
+    SourceBranch: $(Build.SourceBranch)
   displayName: 'Run build'
 
 - task: PowerShell@2
@@ -34,7 +36,7 @@ steps:
     SignClientSecret: $(newtonsoft.signClientSecret)
     ArtifactDirectory: .\Working
   displayName: 'Authenticode sign packages'
-  condition: and(succeeded(), eq(variables['Build.SourceBranch'], 'refs/heads/master'), not(eq(variables['newtonsoft.signClientUser'], '')), not(eq(variables['newtonsoft.signClientSecret'], '')))
+  condition: and(succeeded(), not(eq(variables['build.reason'], 'PullRequest')), not(eq(variables['newtonsoft.signClientUser'], '')), not(eq(variables['newtonsoft.signClientSecret'], '')))
 
 - task: PublishTestResults@2
   inputs:
@@ -55,4 +57,4 @@ steps:
     parallel: true
     parallelCount: 8
   displayName: 'Publish artifacts'
-  condition: and(succeeded(), eq(variables['Build.SourceBranch'], 'refs/heads/master'))
\ No newline at end of file
+  condition: and(succeeded(), not(eq(variables['build.reason'], 'PullRequest')))
\ No newline at end of file