diff --git a/.github/workflows/build-and-test-powershell-module.yml b/.github/workflows/build-and-test-powershell-module.yml
index 6856a03..b744914 100644
--- a/.github/workflows/build-and-test-powershell-module.yml
+++ b/.github/workflows/build-and-test-powershell-module.yml
@@ -47,7 +47,7 @@ env:
 
 jobs:
   build-and-test:
-    runs-on: windows-latest # Use Windows agent to ensure dotnet.exe is available to build C# assemblies, if required.
+    runs-on: windows-latest # Use Windows agent so we can run Pester tests on Windows PowerShell 5.1 as well.
     outputs:
       powerShellModuleName: ${{ env.powerShellModuleName }}
       stableVersionNumber: ${{ steps.version-number.outputs.majorMinorPatch }}
@@ -107,6 +107,25 @@ jobs:
         shell: pwsh
         run: Invoke-ScriptAnalyzer -Path . -Recurse -EnableExit
 
+      - name: Run Pester tests on Windows PowerShell to ensure backward compatibility
+        shell: powershell
+        run: |
+          Write-Output "Pester version being used:"
+          Import-Module -Name Pester
+          Get-Module -Name Pester
+
+          Write-Output "Running all Pester tests in the repo:"
+          $pesterConfig = New-PesterConfiguration @{
+            Output = @{ Verbosity = 'Detailed' }
+            Run = @{ Throw = $true }
+            TestResult = @{
+              Enabled = $true
+              OutputPath = 'test-results-windows-powershell-nunit.xml'
+            }
+            CodeCoverage = @{ Enabled = $false }
+          }
+          Invoke-Pester -Configuration $pesterConfig
+
       - name: Run Pester tests and generate code coverage report
         shell: pwsh
         run: |
@@ -120,7 +139,7 @@ jobs:
             Run = @{ Throw = $true }
             TestResult = @{
               Enabled = $true
-              OutputPath = 'test-results-nunit.xml'
+              OutputPath = 'test-results-pwsh-nunit.xml'
             }
             CodeCoverage = @{
               Enabled = $true
diff --git a/Changelog.md b/Changelog.md
index bd13a95..bcab158 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -2,6 +2,16 @@
 
 This page is a list of _notable_ changes made in each version.
 
+## v1.1.0 - April 20, 2024
+
+Features:
+
+- Run Pester tests during the build on Windows PowerShell too, to catch backward-incompatible changes earlier.
+
+Fixes:
+
+- Use backslash instead of forward-slash to import module in Pester tests for Windows PowerShell backward compatibility.
+
 ## v1.0.0 - April 13, 2024
 
 Features:
diff --git a/ReadMe.md b/ReadMe.md
index 9eebb1f..611de87 100644
--- a/ReadMe.md
+++ b/ReadMe.md
@@ -31,8 +31,9 @@ Use this repo template or module for your new git repository to get the followin
     - Can also manually trigger deployments of feature branches.
   - Version the module.
   - Run PSScriptAnalyzer to ensure best practices are followed.
-  - Run build tests, and smoke tests on multiple platforms (Windows, Linux, MacOS).
-  - Publish the module to the PowerShell Gallery or a custom feed.
+  - Run build tests with Pwsh and PowerShell to ensure backward compatibility.
+  - Run smoke tests on multiple platforms (Windows, Linux, MacOS) to ensure the module works as expected after being installed on all platforms.
+  - Publish the module to the PowerShell Gallery (custom feed support coming soon).
   - Spell check all files in the repository.
   - Display test code coverage results on PRs.
 - Visual Studio Code tasks to easily run Pester tests and PSScriptAnalyzer locally.
diff --git a/src/ScriptModuleRepositoryTemplate/ScriptModuleRepositoryTemplate.Tests.ps1 b/src/ScriptModuleRepositoryTemplate/ScriptModuleRepositoryTemplate.Tests.ps1
index 0407f9d..25a925a 100644
--- a/src/ScriptModuleRepositoryTemplate/ScriptModuleRepositoryTemplate.Tests.ps1
+++ b/src/ScriptModuleRepositoryTemplate/ScriptModuleRepositoryTemplate.Tests.ps1
@@ -1,4 +1,4 @@
-using module './ScriptModuleRepositoryTemplate.psm1'
+using module '.\ScriptModuleRepositoryTemplate.psm1'
 
 Describe 'New-PowerShellScriptModuleRepository' {
 	BeforeEach {
diff --git a/src/ScriptModuleRepositoryTemplate/TemplateRepoFiles/_.github/workflows/build-and-test-powershell-module.yml b/src/ScriptModuleRepositoryTemplate/TemplateRepoFiles/_.github/workflows/build-and-test-powershell-module.yml
index 35e0d20..5107c39 100644
--- a/src/ScriptModuleRepositoryTemplate/TemplateRepoFiles/_.github/workflows/build-and-test-powershell-module.yml
+++ b/src/ScriptModuleRepositoryTemplate/TemplateRepoFiles/_.github/workflows/build-and-test-powershell-module.yml
@@ -47,7 +47,7 @@ env:
 
 jobs:
   build-and-test:
-    runs-on: windows-latest # Use Windows agent to ensure dotnet.exe is available to build C# assemblies, if required.
+    runs-on: windows-latest # Use Windows agent so we can run Pester tests on Windows PowerShell 5.1 as well.
     outputs:
       powerShellModuleName: ${{ env.powerShellModuleName }}
       stableVersionNumber: ${{ steps.version-number.outputs.majorMinorPatch }}
@@ -108,6 +108,25 @@ jobs:
         shell: pwsh
         run: Invoke-ScriptAnalyzer -Path . -Recurse -EnableExit
 
+      - name: Run Pester tests on Windows PowerShell to ensure backward compatibility
+        shell: powershell
+        run: |
+          Write-Output "Pester version being used:"
+          Import-Module -Name Pester
+          Get-Module -Name Pester
+
+          Write-Output "Running all Pester tests in the repo:"
+          $pesterConfig = New-PesterConfiguration @{
+            Output = @{ Verbosity = 'Detailed' }
+            Run = @{ Throw = $true }
+            TestResult = @{
+              Enabled = $true
+              OutputPath = 'test-results-windows-powershell-nunit.xml'
+            }
+            CodeCoverage = @{ Enabled = $false }
+          }
+          Invoke-Pester -Configuration $pesterConfig
+
       - name: Run Pester tests and generate code coverage report
         shell: pwsh
         run: |
@@ -121,7 +140,7 @@ jobs:
             Run = @{ Throw = $true }
             TestResult = @{
               Enabled = $true
-              OutputPath = 'test-results-nunit.xml'
+              OutputPath = 'test-results-pwsh-nunit.xml'
             }
             CodeCoverage = @{
               Enabled = $true
diff --git a/src/ScriptModuleRepositoryTemplate/TemplateRepoFiles/src/__NewModuleName__/__NewModuleName__.Tests.ps1 b/src/ScriptModuleRepositoryTemplate/TemplateRepoFiles/src/__NewModuleName__/__NewModuleName__.Tests.ps1
index a033d94..3cbfdda 100644
--- a/src/ScriptModuleRepositoryTemplate/TemplateRepoFiles/src/__NewModuleName__/__NewModuleName__.Tests.ps1
+++ b/src/ScriptModuleRepositoryTemplate/TemplateRepoFiles/src/__NewModuleName__/__NewModuleName__.Tests.ps1
@@ -1,4 +1,4 @@
-using module './__NewModuleName__.psm1'
+using module '.\__NewModuleName__.psm1'
 
 # UPDATE ME: This is just example code. Replace the code below with your module's tests.
 Describe 'Get-HelloWorld' {