diff --git a/build.ps1 b/build.ps1
index d344858..e97538f 100644
--- a/build.ps1
+++ b/build.ps1
@@ -45,11 +45,13 @@ $csproj = [System.IO.Path]::Combine($src, "dotnet", "dependencies.csproj")
 $bin = [System.IO.Path]::Combine($src, "dotnet", "bin")
 $obj = [System.IO.Path]::Combine($src, "dotnet", "obj")
 $lib = [System.IO.Path]::Combine($publish, "lib")
+$ps51 = [System.IO.Path]::Combine($src, "ps51")
 
 Write-Host "src: $src"
 Write-Host "docs: $docs"
 Write-Host "publish: $publish"
 Write-Host "lib: $lib"
+Write-Host "ps51: $ps51"
 Write-Host "dotnet: $([Environment]::Version)"
 Write-Host "ps: $($PSVersionTable.PSVersion)"
 
@@ -64,7 +66,7 @@ $manifest = @{
 
     FunctionsToExport    = @()
     ModuleVersion        = [version]::new($Major, $Minor, $Build, $Revision)
-    PowerShellVersion    = '7.4'
+    PowerShellVersion    = '5.1'
     ProjectUri           = "https://github.com/dfinke/PowerShellHumanizer"
     LicenseUri           = "https://github.com/dfinke/PowerShellHumanizer/blob/master/LICENSE.txt"
     RootModule           = "$module.psm1"
@@ -105,6 +107,9 @@ function Build {
     Get-ChildItem -Path $lib -filter "*.pdb" | Remove-Item -Force -ErrorAction SilentlyContinue
     Get-ChildItem -Path $lib -filter "System.Management.Automation.dll" | Remove-Item -Force -ErrorAction SilentlyContinue
     Get-ChildItem -Path $lib -filter "dependencies.dll" | Remove-Item -Force -ErrorAction SilentlyContinue
+    
+    # Copy PowerShell 5.1 dll's
+    Copy-Item -Path "$ps51/*.dll" -Destination "$publish/lib"
 
     Copy-Item -Path "$src/$module.psm1" -Destination $publish
     Copy-Item -Path @("$parent/README.md") -Destination $publish -ErrorAction SilentlyContinue
diff --git a/src/PowerShellHumanizer.psm1 b/src/PowerShellHumanizer.psm1
index ae7c3fc..3d6cc3e 100644
--- a/src/PowerShellHumanizer.psm1
+++ b/src/PowerShellHumanizer.psm1
@@ -1,13 +1,9 @@
 # Load  dlls
-Add-Type -Path "$PSScriptRoot/lib/Humanizer.dll"
-
-if ($PSCulture -ne 'en-US') {
-    if (Test-Path "$PSScriptRoot/lib/$PSCulture") {
-        Add-Type -Path "$PSScriptRoot/lib/$PSCulture/Humanizer.resources.dll"
-    } else {
-        Write-Warning "Humanizer doesn't currently support '$PSCulture'."
-    }
+if ($PSVersionTable.PSVersion.Major -lt 6) {
+    Add-Type -Path "$PSScriptRoot/lib/System.Buffers.4.0.2.0.dll"
+    Add-Type -Path "$PSScriptRoot/lib/System.Runtime.CompilerServices.Unsafe.4.0.4.1.dll"
 }
+Add-Type -Path "$PSScriptRoot/lib/Humanizer.dll"
 
 if (Get-Module -Name Terminal-Icons -ListAvailable -ErrorAction SilentlyContinue) {
     Update-FormatData -PrependPath "$PSSCriptRoot/formats/FileInfoIcons.format.ps1xml"
diff --git a/src/dotnet/dependencies.csproj b/src/dotnet/dependencies.csproj
index 088183d..9169b7a 100644
--- a/src/dotnet/dependencies.csproj
+++ b/src/dotnet/dependencies.csproj
@@ -2,11 +2,11 @@
 
   <PropertyGroup>
     <TargetFramework>netstandard2.0</TargetFramework>
-	<Version>3.0.0-beta.13</Version>
+    <Version>3.0.0-beta.54</Version>
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Humanizer" Version="3.0.0-beta.13" />
+    <PackageReference Include="Humanizer" Version="3.0.0-beta.54" />
   </ItemGroup>
 
 </Project>
diff --git a/src/en-US/about_PowerShellHumanizer.help.txt b/src/en-US/about_PowerShellHumanizer.help.txt
index b71cea1..3c2174f 100644
--- a/src/en-US/about_PowerShellHumanizer.help.txt
+++ b/src/en-US/about_PowerShellHumanizer.help.txt
@@ -54,7 +54,7 @@ INTEGER EXTENSION PROPERTIES
     .Milliseconds
 
 TIMESPAN EXTENSION METHODS
-    .Humanize([int]Precision)
+    .Humanize([int]Precision, [CultureInfo]Culture, [Humanizer.TimeUnit]MaxUnit, [string]CollectionSeparator, [bool]ToWords)
 
 DATETIME EXTENSION METHODS
     .Humanize([bool]UTC)
\ No newline at end of file
diff --git a/src/formats/FileInfo.format.ps1xml b/src/formats/FileInfo.format.ps1xml
index f335a03..f69b9fa 100644
--- a/src/formats/FileInfo.format.ps1xml
+++ b/src/formats/FileInfo.format.ps1xml
@@ -1,3 +1,4 @@
+<?xml version="1.0" encoding="utf-8" ?>
 <Configuration>
     <SelectionSets>
         <SelectionSet>
@@ -8,7 +9,6 @@
             </Types>
         </SelectionSet>
     </SelectionSets>
-
     <!-- ################ GLOBAL CONTROL DEFINITIONS ################ -->
     <Controls>
         <Control>
@@ -22,12 +22,12 @@
                                         <CustomItem>
                                             <Text AssemblyName="System.Management.Automation" BaseName="FileSystemProviderStrings" ResourceId="DirectoryDisplayGrouping"/>
                                             <ExpressionBinding>
-                                              <ScriptBlock>
-                                                  $_.PSParentPath.Replace("Microsoft.PowerShell.Core\FileSystem::", "")                                                  
-                                              </ScriptBlock>
+                                                <ScriptBlock>
+                                                    $_.PSParentPath.Replace("Microsoft.PowerShell.Core\FileSystem::", "")
+                                                </ScriptBlock>
                                             </ExpressionBinding>
                                             <NewLine/>
-                                        </CustomItem> 
+                                        </CustomItem>
                                     </Frame>
                                 </CustomItem>
                             </CustomEntry>
@@ -35,26 +35,24 @@
             </CustomControl>
         </Control>
     </Controls>
-    
     <!-- ################ VIEW DEFINITIONS ################ -->
-
     <ViewDefinitions>
-       <View>
+        <View>
             <Name>children</Name>
             <ViewSelectedBy>
                 <SelectionSetName>FileSystemTypes</SelectionSetName>
             </ViewSelectedBy>
             <GroupBy>
-                <PropertyName>PSParentPath</PropertyName> 
-                <CustomControlName>FileSystemTypes-GroupingFormat</CustomControlName>  
+                <PropertyName>PSParentPath</PropertyName>
+                <CustomControlName>FileSystemTypes-GroupingFormat</CustomControlName>
             </GroupBy>
             <TableControl>
                 <TableHeaders>
-                   <TableColumnHeader>
-                      <Label>Mode</Label>
-                      <Width>8</Width>
-                      <Alignment>left</Alignment>
-                   </TableColumnHeader>
+                    <TableColumnHeader>
+                        <Label>Mode</Label>
+                        <Width>8</Width>
+                        <Alignment>Left</Alignment>
+                    </TableColumnHeader>
                     <TableColumnHeader>
                         <Label>LastWritten</Label>
                         <Width>15</Width>
@@ -62,7 +60,7 @@
                     <TableColumnHeader>
                         <Label>Length</Label>
                         <Width>10</Width>
-                        <Alignment>right</Alignment>
+                        <Alignment>Right</Alignment>
                     </TableColumnHeader>
                     <TableColumnHeader/>
                 </TableHeaders>
@@ -80,7 +78,7 @@
                             </TableColumnItem>
                             <TableColumnItem>
                                 <ScriptBlock>
-                                    if (-not $_.PSIsContainer) { [Humanizer.ByteSizeExtensions]::bytes($_.Length).ToString(0.00)} 
+                                    if (-not $_.PSIsContainer) { [Humanizer.ByteSizeExtensions]::bytes($_.Length).ToString(0.00)}
                                 </ScriptBlock>
                             </TableColumnItem>
                             <TableColumnItem>
@@ -92,4 +90,4 @@
             </TableControl>
         </View>
     </ViewDefinitions>
-</Configuration>        
\ No newline at end of file
+</Configuration>
diff --git a/src/formats/FileInfoIcons.format.ps1xml b/src/formats/FileInfoIcons.format.ps1xml
index 48c60c3..7b9a4ce 100644
--- a/src/formats/FileInfoIcons.format.ps1xml
+++ b/src/formats/FileInfoIcons.format.ps1xml
@@ -1,5 +1,4 @@
 <?xml version="1.0" encoding="utf-8" ?>
-
 <!-- Based on the format.ps1xml file from DirColors
 https://github.com/DHowett/DirColors -->
 <Configuration>
@@ -26,7 +25,7 @@ https://github.com/DHowett/DirColors -->
                                     <Text AssemblyName="System.Management.Automation" BaseName="FileSystemProviderStrings" ResourceId="DirectoryDisplayGrouping"/>
                                     <ExpressionBinding>
                                         <ScriptBlock>
-                                                  $_.PSParentPath.Replace("Microsoft.PowerShell.Core\FileSystem::", "")
+                                            $_.PSParentPath.Replace("Microsoft.PowerShell.Core\FileSystem::", "")
                                         </ScriptBlock>
                                     </ExpressionBinding>
                                     <NewLine/>
@@ -54,17 +53,17 @@ https://github.com/DHowett/DirColors -->
                     <TableColumnHeader>
                         <Label>Mode</Label>
                         <Width>7</Width>
-                        <Alignment>left</Alignment>
+                        <Alignment>Left</Alignment>
                     </TableColumnHeader>
                     <TableColumnHeader>
                         <Label>LastWriteTime</Label>
                         <Width>25</Width>
-                        <Alignment>right</Alignment>
+                        <Alignment>Right</Alignment>
                     </TableColumnHeader>
                     <TableColumnHeader>
                         <Label>Length</Label>
                         <Width>14</Width>
-                        <Alignment>right</Alignment>
+                        <Alignment>Right</Alignment>
                     </TableColumnHeader>
                     <TableColumnHeader>
                         <Label>Name</Label>
@@ -228,4 +227,4 @@ https://github.com/DHowett/DirColors -->
             </WideControl>
         </View>
     </ViewDefinitions>
-</Configuration>
\ No newline at end of file
+</Configuration>
diff --git a/src/ps51/System.Buffers.4.0.2.0.dll b/src/ps51/System.Buffers.4.0.2.0.dll
new file mode 100644
index 0000000..b6d9c77
Binary files /dev/null and b/src/ps51/System.Buffers.4.0.2.0.dll differ
diff --git a/src/ps51/System.Runtime.CompilerServices.Unsafe.4.0.4.1.dll b/src/ps51/System.Runtime.CompilerServices.Unsafe.4.0.4.1.dll
new file mode 100644
index 0000000..e717510
Binary files /dev/null and b/src/ps51/System.Runtime.CompilerServices.Unsafe.4.0.4.1.dll differ
diff --git a/src/public/ConvertTo-Quantity.ps1 b/src/public/ConvertTo-Quantity.ps1
index fe0b724..d9dbd86 100644
--- a/src/public/ConvertTo-Quantity.ps1
+++ b/src/public/ConvertTo-Quantity.ps1
@@ -26,10 +26,10 @@ function ConvertTo-Quantity {
     [CmdletBinding()]
     [OutputType('string')]
     param(
-        [Parameter(Mandatory, Position = 0, ValueFromPipeline)]
+        [Parameter(Mandatory, Position = 0)]
         [string]$String,
 
-        [Parameter(Mandatory, Position = 1)]
+        [Parameter(Mandatory, Position = 1, ValueFromPipeline)]
         [Alias('Count')]
         [int]$Quantity,
 
diff --git a/src/types/TimeSpan.types.ps1xml b/src/types/TimeSpan.types.ps1xml
index e7ee14e..c50158e 100644
--- a/src/types/TimeSpan.types.ps1xml
+++ b/src/types/TimeSpan.types.ps1xml
@@ -7,10 +7,24 @@
                 <Name>Humanize</Name>
                 <Script>
                     [OutputType([System.String])]
-                    param([int]$Precision = 1)                  
-                    [Humanizer.TimeSpanHumanizeExtensions]::Humanize($this, $Precision)
+                    param(
+                        [Int]$Precision = 1,
+                        [CultureInfo]$Culture = [CultureInfo]::CurrentUICulture,
+                        [Humanizer.TimeUnit]$MaxUnit = [Humanizer.TimeUnit]::Year,
+                        [String]$CollectionSeparator = ', ',
+                        [Boolean]$ToWords = $false
+                    )
+                    [Humanizer.TimeSpanHumanizeExtensions]::Humanize(
+                        $this,
+                        $Precision,
+                        $Culture,
+                        $MaxUnit,
+                        [Humanizer.TimeUnit]::Millisecond,
+                        $CollectionSeparator,
+                        $ToWords
+                    )
                 </Script>
-            </ScriptMethod>                                                                      
+            </ScriptMethod>
         </Members>
     </Type>
-</Types>            
\ No newline at end of file
+</Types>
diff --git a/tests/PowerShellHumanizer.Tests.ps1 b/tests/PowerShellHumanizer.Tests.ps1
index 89821e7..cd6fd52 100644
--- a/tests/PowerShellHumanizer.Tests.ps1
+++ b/tests/PowerShellHumanizer.Tests.ps1
@@ -151,8 +151,8 @@ Describe 'Custom Formats' {
 
     Context 'FileSystem' {
         BeforeAll {
-            $listAlphaLower = 'a'..'z'
-            $listAlphaUpper = 'A'..'Z'
+            $listAlphaLower = [char[]](97..122)
+            $listAlphaUpper = [char[]](65..90)
             $listNumber = 0..9
             $charset = $listAlphaLower + $listAlphaUpper + $listNumber