diff --git a/.github/workflows/coding-standards.yml b/.github/workflows/coding-standards.yml
index dac4fb643c..c6249f97de 100644
--- a/.github/workflows/coding-standards.yml
+++ b/.github/workflows/coding-standards.yml
@@ -79,7 +79,7 @@ jobs:
   # - Installs NodeJS 12 (todo: install the version of NPM specified in the `.nvmrc` file to support older branches)
   # - Sets up caching for NPM.
   # - Logs updated debug information.
-  # _ Installs NPM dependencies.
+  # _ Installs NPM dependencies using install-changed to hash the `package.json` file.
   # - Run the WordPress JSHint checks.
   # - todo: Configure Slack notifications for failing tests.
   jshint:
@@ -120,7 +120,7 @@ jobs:
           node --version
 
       - name: Install Dependencies
-        run: npm ci
+        run: npx install-changed --install-command="npm ci"
 
       - name: Run JSHint
         run: npm run grunt jshint
diff --git a/.github/workflows/end-to-end-tests.yml b/.github/workflows/end-to-end-tests.yml
index aa83092d84..9fe6f0b800 100644
--- a/.github/workflows/end-to-end-tests.yml
+++ b/.github/workflows/end-to-end-tests.yml
@@ -22,7 +22,7 @@ jobs:
   # - Logs debug information about the runner container.
   # - Installs NodeJS 12 (todo: install the version of NPM specified in the `.nvmrc` file to support older branches)
   # - Sets up caching for NPM.
-  # _ Installs NPM dependencies.
+  # _ Installs NPM dependencies using install-changed to hash the `package.json` file.
   # - Builds WordPress to run from the `build` directory.
   # - Starts the WordPress Docker container.
   # - Logs general debug information.
@@ -77,7 +77,7 @@ jobs:
             ${{ runner.os }}-npm-
 
       - name: Install Dependencies
-        run: npm ci
+        run: npx install-changed --install-command="npm ci"
 
       - name: Build WordPress
         run: npm run build
diff --git a/.github/workflows/javascript-tests.yml b/.github/workflows/javascript-tests.yml
index aae2476e57..1508d564aa 100644
--- a/.github/workflows/javascript-tests.yml
+++ b/.github/workflows/javascript-tests.yml
@@ -17,7 +17,7 @@ jobs:
   # - Installs NodeJS 12 (todo: install the version of NPM specified in the `.nvmrc` file to support older branches)
   # - Sets up caching for NPM.
   # - Logs updated debug information.
-  # _ Installs NPM dependencies.
+  # _ Installs NPM dependencies using install-changed to hash the `package.json` file.
   # - Run the WordPress QUnit tests.
   # - todo: Configure Slack notifications for failing tests.
   test-js:
@@ -62,7 +62,7 @@ jobs:
           node --version
 
       - name: Install Dependencies
-        run: npm ci
+        run: npx install-changed --install-command="npm ci"
 
       - name: Run QUnit tests
         run: npm run grunt qunit:compiled
diff --git a/.github/workflows/phpunit-tests.yml b/.github/workflows/phpunit-tests.yml
index 16ef65deae..f37c93b5a7 100644
--- a/.github/workflows/phpunit-tests.yml
+++ b/.github/workflows/phpunit-tests.yml
@@ -28,7 +28,7 @@ jobs:
   # - Logs debug information about the runner container.
   # - Installs NodeJS 12 (todo: install the version of NPM specified in the `.nvmrc` file to support older branches)
   # - Sets up caching for NPM.
-  # _ Installs NPM dependencies.
+  # _ Installs NPM dependencies using install-changed to hash the `package.json` file.
   # - Builds WordPress to run from the `build` directory.
   # - Creates a ZIP file of compiled WordPress
   # - Uploads ZIP file as an artifact.
@@ -51,6 +51,8 @@ jobs:
 
       - name: Log debug information
         run: |
+          echo "$GITHUB_REF"
+          echo "$GITHUB_EVENT_NAME"
           npm --version
           node --version
           curl --version
@@ -77,7 +79,7 @@ jobs:
             ${{ runner.os }}-npm-
 
       - name: Install Dependencies
-        run: npm ci
+        run: npx install-changed --install-command="npm ci"
 
       - name: Build WordPress
         run: npm run build
@@ -86,7 +88,7 @@ jobs:
         uses: thedoctor0/zip-release@0.4.1
         with:
           filename: built-wp-${{ github.sha }}.zip
-          exclusions: '/*node_modules/*'
+          exclusions: '*.git* /*node_modules/* packagehash.txt'
 
       - name: Upload build artifact
         uses: actions/upload-artifact@v2
@@ -104,7 +106,7 @@ jobs:
   # - Unzips the artifact.
   # - Installs NodeJS 12 (todo: install the version of NPM specified in the `nvmrc` file to support older branches)
   # - Sets up caching for NPM.
-  # _ Installs NPM dependencies.
+  # _ Installs NPM dependencies using install-changed to hash the `package.json` file.
   # - Configures caching for Composer.
   # _ Installs Composer dependencies (if desired)
   # - Logs Docker debug information (about both the Docker installation within the runner)
@@ -172,7 +174,7 @@ jobs:
             ${{ runner.os }}-npm-
 
       - name: Install Dependencies
-        run: npm ci
+        run: npx install-changed --install-command="npm ci"
 
       - name: Get composer cache directory
         id: composer-cache
diff --git a/.github/workflows/verify-npm-on-windows.yml b/.github/workflows/verify-npm-on-windows.yml
index e01915a61f..c5d8e383ea 100644
--- a/.github/workflows/verify-npm-on-windows.yml
+++ b/.github/workflows/verify-npm-on-windows.yml
@@ -19,7 +19,7 @@ jobs:
   # - Logs debug information about the runner container.
   # - Installs NodeJS 12 (todo: install the version of NPM specified in the `.nvmrc` file to support older branches)
   # - Sets up caching for NPM.
-  # _ Installs NPM dependencies.
+  # _ Installs NPM dependencies using install-changed to hash the `package.json` file.
   # - Builds WordPress to run from the `build` directory.
   test-npm:
     name: Tests NPM on Windows
@@ -62,7 +62,7 @@ jobs:
             ${{ runner.os }}-npm-
 
       - name: Install Dependencies
-        run: npm ci
+        run: npx install-changed --install-command="npm ci"
 
       - name: Build WordPress
         run: npm run build