diff --git a/.cspell.json b/.cspell.json
index a933584..2895231 100644
--- a/.cspell.json
+++ b/.cspell.json
@@ -10,7 +10,10 @@
 		"**/_.gitignore",
 		"**/devcontainer.json",
 		"**/build-and-test-powershell-module.yml",
-		"**/build-test-and-deploy-powershell-module.yml"
+		"**/build-test-and-deploy-powershell-module.yml",
+		"**/bin/**", // Ignore C# build output files.
+		"**/obj/**", // Ignore C# build output files.
+		".gitignore"
 	],
 	"words": [
 		"behaviour",
diff --git a/.devcontainer/devcontainer.json b/.devcontainer/devcontainer.json
index 65f375d..3fe48dd 100644
--- a/.devcontainer/devcontainer.json
+++ b/.devcontainer/devcontainer.json
@@ -3,7 +3,7 @@
 {
 	"name": "PowerShell",
 	// Or use a Dockerfile or Docker Compose file. More info: https://containers.dev/guide/dockerfile
-	"image": "mcr.microsoft.com/powershell:lts-debian-11",
+	"image": "mcr.microsoft.com/dotnet/sdk:9.0",
 	"features": {
 		"ghcr.io/devcontainers/features/common-utils:2": {
 			"installZsh": "true",
@@ -13,8 +13,9 @@
 		}
 	},
 
-	// Set VS Code's default shell to PowerShell.
-	"postCreateCommand": "sudo chsh vscode -s \"$(which pwsh)\"",
+	// Set pwsh as the default shell for the devcontainer, install required PowerShell modules, and install NPM and CSpell.
+	// If you do not plan to use CSpell, you can remove everything after and including 'sudo apt update'.
+	"postCreateCommand": "sudo chsh vscode -s \"$(which pwsh)\"; pwsh -c \"Install-Module Pester -Force\"; pwsh -c \"Install-Module PSScriptAnalyzer -Force\"; sudo apt update; sudo DEBIAN_FRONTEND=noninteractive apt install -y npm; npm install cspell",
 
 	// Configure tool-specific properties.
 	"customizations": {
diff --git a/.gitignore b/.gitignore
index 0beb3dc..9bba3b6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,9 @@
+# Custom additions:
+
+# Ignore NPM files.
+package-lock.json
+package.json
+
 # Created by https://www.toptal.com/developers/gitignore/api/powershell,visualstudiocode,visualstudio
 # Edit at https://www.toptal.com/developers/gitignore?templates=powershell,visualstudiocode,visualstudio
 
diff --git a/.vscode/tasks.json b/.vscode/tasks.json
index 6de0722..feab2e8 100644
--- a/.vscode/tasks.json
+++ b/.vscode/tasks.json
@@ -9,7 +9,8 @@
 				"isDefault": true
 			},
 			"dependsOn": [
-				"Run PSScriptAnalyzer linter"
+				"Run PSScriptAnalyzer linter",
+				"Run CSpell spell checker"
 			]
 		},
 		{
@@ -46,6 +47,31 @@
 				"$func-powershell-watch"
 			]
 		},
+		{
+			"label": "Run CSpell spell checker",
+			"type": "shell",
+			"options": {
+				"shell": {
+					"executable": "pwsh",
+					"args": [
+						"-NoProfile",
+						"-Command"
+					]
+				}
+			},
+			// If npx is not available, warn that Node.js is not installed. If we cannot run cspell, try to install and run it, and warn if we still cannot run it.
+			"command": "try { & npx -v > $null } catch {}; if (-not $?) { Write-Warning 'Node.js is not installed, so cannot download and run npx cspell.' } else { try { & npx cspell . } catch {}; if (-not $?) { & npm install cspell; & npx cspell . }; if (-not $?) { Write-Warning 'There was a problem installing or running cspell' } }",
+			"group": "build",
+			"presentation": {
+				"reveal": "always",
+				"panel": "dedicated",
+				"clear": true,
+				"group": "build"
+			},
+			"problemMatcher": [
+				"$func-powershell-watch"
+			]
+		},
 		{
 			"label": "Run all Pester tests",
 			"type": "shell",
diff --git a/Changelog.md b/Changelog.md
index bcab158..3766c41 100644
--- a/Changelog.md
+++ b/Changelog.md
@@ -2,6 +2,14 @@
 
 This page is a list of _notable_ changes made in each version.
 
+## v1.2.0 - March 27, 2025
+
+Features:
+
+- Add VS Code task to run CSpell spellcheck when building, as well as a stand-alone VS Code task.
+- Update dev container to the latest PowerShell image and have it install PSScriptAnalyzer, Pester, and CSpell.
+- Update default Contributing.md to include information around local development and building.
+
 ## v1.1.0 - April 20, 2024
 
 Features:
diff --git a/src/ScriptModuleRepositoryTemplate/TemplateRepoFiles/_.cspell.json b/src/ScriptModuleRepositoryTemplate/TemplateRepoFiles/_.cspell.json
index b4a3bcf..0085d1e 100644
--- a/src/ScriptModuleRepositoryTemplate/TemplateRepoFiles/_.cspell.json
+++ b/src/ScriptModuleRepositoryTemplate/TemplateRepoFiles/_.cspell.json
@@ -7,7 +7,8 @@
 	"language": "en",
 	"ignorePaths": [
 		".devcontainer/devcontainer.json",
-		".github/workflows/*.yml"
+		".github/workflows/*.yml",
+		".gitignore"
 	],
 	"words": [
 		"behaviour",
diff --git a/src/ScriptModuleRepositoryTemplate/TemplateRepoFiles/docs/Contributing.md b/src/ScriptModuleRepositoryTemplate/TemplateRepoFiles/docs/Contributing.md
index 32903b0..d8ff807 100644
--- a/src/ScriptModuleRepositoryTemplate/TemplateRepoFiles/docs/Contributing.md
+++ b/src/ScriptModuleRepositoryTemplate/TemplateRepoFiles/docs/Contributing.md
@@ -2,6 +2,22 @@
 
 Feel free to open an issue or pull request.
 
+## 💻 Local development
+
+This PowerShell module is developed using Visual Studio Code.
+If you encounter any issues developing on your local machine, you can use [Docker Desktop](https://www.docker.com/products/docker-desktop/) and the [Dev Containers](https://marketplace.visualstudio.com/items?itemName=ms-vscode-remote.remote-containers) VS Code extension to develop in a Docker container with all of the required dependencies, so that you do not have to install them locally.
+You may also develop in your web browser with GitHub Codespaces to avoid needing to put any code or dependencies on your local machine.
+
+### 🛠️ Building and testing
+
+The code is built and tested by CI/CD pipelines on every commit to the `main` branch and every PR opened against the `main` branch.
+
+When developing locally, you can use [the VS Code tasks](/.vscode/tasks.json) to simulate the build and test process and be notified of any problems before pushing your code up to the remote repository.
+In VS Code, open the command palette (Ctrl+Shift+P) and select `Tasks: Run Build Task` or `Tasks: Run Test Task`.
+
+When you run the build task, it will run PSScriptAnalyzer and CSpell spellcheck.
+If CSpell flags a word as `unknown` that is not misspelled, you can add it to the `.cspell.json` file in the root of the repository to have it ignore the word.
+
 ## 🚀 Publishing new versions
 
 A prerelease version of the module is published automatically on every commit to the `main` branch.