diff --git a/Build.ps1 b/Build.ps1
index c385d8b1..3b80be47 100644
--- a/Build.ps1
+++ b/Build.ps1
@@ -30,7 +30,7 @@ $script:DependencyVersions = @{
         'powershell-yaml'  = $null
         'ps1xmlgen'        = $null
         'PlatyPS'          = $null
-        'Pester'           = @{ MinimumVersion = '5.0' }
+        'Pester'           = @{ RequiredVersion = '6.0.0-rc4'; AllowPrerelease = $true }
     }
 }
 
@@ -122,11 +122,15 @@ Function Install-PsModule($Module, $Version) {
     Write-Verbose "Restoring module $Module"
 
     $minVersion = if ($Version -is [hashtable]) { $Version['MinimumVersion'] } else { $null }
-    $exactVersion = if ($Version -is [hashtable]) { $null } else { $Version }
+    $exactVersion = if ($Version -is [hashtable]) { $Version['RequiredVersion'] } else { $Version }
+    $allowPrerelease = ($Version -is [hashtable]) -and $Version['AllowPrerelease']
 
     $existing = Get-Module $Module -ListAvailable | Sort-Object Version -Descending | Select-Object -First 1
     if ($existing) {
-        if ($exactVersion -and $existing.Version -ne [version]$exactVersion) { <# fall through to install #> }
+        $existingVersion = $existing.Version.ToString()
+        if ($existing.PrivateData.PSData.Prerelease) { $existingVersion = "$existingVersion-$($existing.PrivateData.PSData.Prerelease)" }
+
+        if ($exactVersion -and $existingVersion -ne $exactVersion) { <# fall through to install #> }
         elseif ($minVersion -and $existing.Version -lt [version]$minVersion) { <# fall through to install #> }
         else {
             Write-Verbose "PowerShell module $Module found; Skipping..."
@@ -140,8 +144,9 @@ Function Install-PsModule($Module, $Version) {
     }
 
     $installArgs = @{ Name = $Module; Scope = 'CurrentUser'; Force = $true; AllowClobber = $true }
-    if ($exactVersion)  { $installArgs['RequiredVersion'] = $exactVersion }
-    if ($minVersion)    { $installArgs['MinimumVersion']  = $minVersion }
+    if ($exactVersion)     { $installArgs['RequiredVersion'] = $exactVersion }
+    if ($minVersion)       { $installArgs['MinimumVersion']  = $minVersion }
+    if ($allowPrerelease)  { $installArgs['AllowPrerelease'] = $true }
     Install-Module @installArgs | Write-Verbose
 }
 
@@ -200,6 +205,8 @@ try {
 
     $pesterSpec = $script:DependencyVersions.PsModules['Pester']
     $pesterMinVersion = if ($pesterSpec -is [hashtable]) { $pesterSpec['MinimumVersion'] } else { $null }
+    $pesterRequiredVersion = if ($pesterSpec -is [hashtable]) { $pesterSpec['RequiredVersion'] } else { $pesterSpec }
+    $pesterAllowPrerelease = ($pesterSpec -is [hashtable]) -and $pesterSpec['AllowPrerelease']
 
     Invoke-Psake -Nologo -BuildFile $psakeScript -TaskList $Targets -Verbose:$IsVerbose -ErrorAction SilentlyContinue `
         -Parameters @{
@@ -215,7 +222,9 @@ try {
         SkipReleaseNotes  = $SkipReleaseNotes.IsPresent
         Incremental       = $Incremental.IsPresent
         IsCI              = $isCI
-        PesterMinVersion  = $pesterMinVersion
+        PesterMinVersion      = $pesterMinVersion
+        PesterRequiredVersion = $pesterRequiredVersion
+        PesterAllowPrerelease = $pesterAllowPrerelease
     }
 
     Write-Verbose "=== END PSAKE ==="
diff --git a/psake.ps1 b/psake.ps1
index da74ea1e..b526aa23 100644
--- a/psake.ps1
+++ b/psake.ps1
@@ -57,6 +57,8 @@ Properties {
 
     # Test dependencies
     $PesterMinVersion = $null
+    $PesterRequiredVersion = $null
+    $PesterAllowPrerelease = $false
 }
 
 Task Rebuild -Depends Clean, Build {
@@ -247,7 +249,10 @@ Task AllTests -PreCondition { -not $SkipTests } {
 
     try {
         Write-Output ' == PowerShell Core =='
-        if ($PesterMinVersion) {
+        if ($PesterRequiredVersion) {
+            $allowPrereleaseArg = if ($PesterAllowPrerelease) { '-AllowPrerelease' } else { '' }
+            Exec { pwsh.exe -NonInteractive -NoLogo -Command "if (-not (Get-Module Pester -ListAvailable | Where-Object { `$version = `$_.Version.ToString(); if (`$_.PrivateData.PSData.Prerelease) { `$version = `$version + '-' + `$_.PrivateData.PSData.Prerelease }; `$version -eq '$PesterRequiredVersion' })) { Install-Module Pester -RequiredVersion $PesterRequiredVersion $allowPrereleaseArg -Force -Scope CurrentUser -SkipPublisherCheck -AllowClobber }" }
+        } elseif ($PesterMinVersion) {
             Exec { pwsh.exe -NonInteractive -NoLogo -Command "if (-not (Get-Module Pester -ListAvailable | Where-Object { `$_.Version -ge [version]'$PesterMinVersion' })) { Install-Module Pester -MinimumVersion $PesterMinVersion -Force -Scope CurrentUser -SkipPublisherCheck -AllowClobber }" }
         }
         Exec { pwsh.exe -NonInteractive -NoLogo -Command "`$cfg = New-PesterConfiguration; `$cfg.Run.Exit = `$true; `$cfg.TestResult.Enabled = `$true; `$cfg.Output.Verbosity = '$outputLevel'; `$cfg.Filter.ExcludeTag = @('Desktop', 'Server'); Invoke-Pester -Configuration `$cfg" }
@@ -255,7 +260,10 @@ Task AllTests -PreCondition { -not $SkipTests } {
         Move-Item 'coverage.xml' -Destination $OutDir/Coverage-Pester-Core.xml -Force
     
         Write-Output ' == PowerShell Desktop =='
-        if ($PesterMinVersion) {
+        if ($PesterRequiredVersion) {
+            $allowPrereleaseArg = if ($PesterAllowPrerelease) { '-AllowPrerelease' } else { '' }
+            Exec { powershell.exe -NonInteractive -NoLogo -Command "if (-not (Get-Module Pester -ListAvailable | Where-Object { `$version = `$_.Version.ToString(); if (`$_.PrivateData.PSData.Prerelease) { `$version = `$version + '-' + `$_.PrivateData.PSData.Prerelease }; `$version -eq '$PesterRequiredVersion' })) { Install-Module Pester -RequiredVersion $PesterRequiredVersion $allowPrereleaseArg -Force -Scope CurrentUser -SkipPublisherCheck -AllowClobber }" }
+        } elseif ($PesterMinVersion) {
             Exec { powershell.exe -NonInteractive -NoLogo -Command "if (-not (Get-Module Pester -ListAvailable | Where-Object { `$_.Version -ge [version]'$PesterMinVersion' })) { Install-Module Pester -MinimumVersion $PesterMinVersion -Force -Scope CurrentUser -SkipPublisherCheck -AllowClobber }" }
         }
         Exec { powershell.exe -NonInteractive -NoLogo -Command "`$cfg = New-PesterConfiguration; `$cfg.Run.Exit = `$true; `$cfg.TestResult.Enabled = `$true; `$cfg.Output.Verbosity = '$outputLevel'; `$cfg.Filter.ExcludeTag = @('Core', 'Server'); Invoke-Pester -Configuration `$cfg" }