diff --git a/.github/actions/install-root-dependencies/action.yaml b/.github/actions/install-root-dependencies/action.yaml
new file mode 100644
index 00000000000..ddfd09cb824
--- /dev/null
+++ b/.github/actions/install-root-dependencies/action.yaml
@@ -0,0 +1,21 @@
+name: Install root dependencies
+runs:
+  using: composite
+  steps:
+    -   name: Get Composer Cache Directory
+        id: composer-cache
+        run: |
+          echo "dir=$(composer config cache-files-dir)" >> $GITHUB_OUTPUT
+        shell: bash
+
+    - name: Cache root Composer dependencies
+      uses: actions/cache@v4
+      with:
+        path: ${{ steps.composer-cache.outputs.dir }}
+        key: ${{ runner.os }}-composer-root-${{ hashFiles('composer.json') }}
+        restore-keys: |
+          ${{ runner.os }}-composer-root-
+
+    - name: Install root Composer dependencies
+      run: composer install
+      shell: bash
diff --git a/.github/actions/install-website-dependencies/action.yaml b/.github/actions/install-website-dependencies/action.yaml
new file mode 100644
index 00000000000..41928fc76eb
--- /dev/null
+++ b/.github/actions/install-website-dependencies/action.yaml
@@ -0,0 +1,27 @@
+name: Install website dependencies
+inputs:
+  dependency-version:
+    description: 'The version of dependencies to install. Can be "locked" or "highest"'
+    default: 'locked'
+    required: false
+runs:
+  using: composite
+  steps:
+    -   name: Get Composer Cache Directory
+        id: composer-cache
+        run: |
+          echo "dir=$(composer config cache-files-dir)" >> $GITHUB_OUTPUT
+        shell: bash
+
+    - name: Cache website Composer dependencies
+      uses: actions/cache@v4
+      with:
+        path: ${{ steps.composer-cache.outputs.dir }}
+        key: ${{ runner.os }}-composer-website-${{ inputs.dependency-version }}-${{ hashFiles('ux.symfony.com/composer.json') }}
+        restore-keys: |
+          ${{ runner.os }}-composer-website-${{ inputs.dependency-version }}-
+
+    - name: Install website Composer dependencies
+      run: composer ${{ inputs.dependency-version == 'highest' && 'update' || 'install' }}
+      shell: bash
+      working-directory: ux.symfony.com
diff --git a/.github/workflows/app-tests.yaml b/.github/workflows/app-tests.yaml
index d28e417052b..528168d2309 100644
--- a/.github/workflows/app-tests.yaml
+++ b/.github/workflows/app-tests.yaml
@@ -45,8 +45,20 @@ jobs:
 
         - uses: shivammathur/setup-php@v2
 
-        - name: Install root dependencies
-          run: composer install
+        - name: Get Composer Cache Directory
+          id: composer-cache
+          run: |
+            echo "dir=$(composer config cache-files-dir)" >> $GITHUB_OUTPUT
+
+        - name: Cache Testing apps dependencies
+          uses: actions/cache@v4
+          with:
+            path: ${{ steps.composer-cache.outputs.dir }}
+            key: ${{ runner.os }}-composer-testing-app-${{ matrix.ux-packages-source }}-${{ hashFiles('test_apps/**/composer.json') }}
+            restore-keys: |
+              ${{ runner.os }}-composer-testing-app-${{ matrix.ux-packages-source }}-
+
+        - uses: ./.github/actions/install-root-dependencies
 
         - name: Build root packages
           run: php .github/build-packages.php
diff --git a/.github/workflows/code-quality.yaml b/.github/workflows/code-quality.yaml
index bf705c0bc6f..c5477d69966 100644
--- a/.github/workflows/code-quality.yaml
+++ b/.github/workflows/code-quality.yaml
@@ -83,8 +83,7 @@ jobs:
                     php-version: 8.1
                     tools: flex
 
-            - name: Install root dependencies
-              run: composer install
+            - uses: ./.github/actions/install-root-dependencies
 
             - name: Build root packages
               run: php .github/build-packages.php
diff --git a/.github/workflows/functional-tests.yml b/.github/workflows/functional-tests.yml
index a38db2e96ae..3674f31a7c8 100644
--- a/.github/workflows/functional-tests.yml
+++ b/.github/workflows/functional-tests.yml
@@ -10,6 +10,10 @@ on:
             - '.github/workflows/functional-tests.yml'
             - 'src/Turbo/**'
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
+  cancel-in-progress: true
+
 jobs:
     turbo-tests:
         runs-on: ubuntu-latest
@@ -56,8 +60,20 @@ jobs:
                   php-version: ${{ matrix.php-version }}
                   tools: flex
 
-            - name: Install root dependencies
-              run: composer install
+            -   name: Get Composer Cache Directory
+                id: composer-cache
+                run: |
+                    echo "dir=$(composer config cache-files-dir)" >> $GITHUB_OUTPUT
+
+            - name: Cache packages dependencies
+              uses: actions/cache@v4
+              with:
+                  path: ${{ steps.composer-cache.outputs.dir }}
+                  key: ${{ runner.os }}-composer-turbo-${{ matrix.php-version }}-${{ matrix.dependency-version }}-${{ matrix.symfony-version }}-${{ matrix.minimum-stability }}-${{ hashFiles('src/**/composer.json') }}
+                  restore-keys: |
+                      ${{ runner.os }}-composer-turbo-${{ matrix.php-version }}-
+
+            - uses: ./.github/actions/install-root-dependencies
 
             - name: Build root packages
               run: php .github/build-packages.php
diff --git a/.github/workflows/toolkit-kits-code-quality.yaml b/.github/workflows/toolkit-kits-code-quality.yaml
index 0ed5ccfc968..af4759587c9 100644
--- a/.github/workflows/toolkit-kits-code-quality.yaml
+++ b/.github/workflows/toolkit-kits-code-quality.yaml
@@ -15,13 +15,23 @@ jobs:
             - uses: actions/checkout@v4
 
             - uses: shivammathur/setup-php@v2
+
+            - name: Get Composer Cache Directory
+              id: composer-cache
+              run: |
+                  echo "dir=$(composer config cache-files-dir)" >> $GITHUB_OUTPUT
+
+            - name: Cache dependencies
+              uses: actions/cache@v4
               with:
-                php-version: 8.3
+                path: ${{ steps.composer-cache.outputs.dir }}
+                key: ${{ runner.os }}-composer-kits-${{ hashFiles('composer.json') }}
+                restore-keys: |
+                  ${{ runner.os }}-composer-kits-
 
             - name: Install composer packages
-              uses: ramsey/composer-install@v3
-              with:
-                working-directory: src/Toolkit
+              run: composer install
+              working-directory: src/Toolkit
 
             - name: Check kits code style
               run: php vendor/bin/twig-cs-fixer check kits
diff --git a/.github/workflows/unit-tests.yaml b/.github/workflows/unit-tests.yaml
index facda11d330..2cb65746a00 100644
--- a/.github/workflows/unit-tests.yaml
+++ b/.github/workflows/unit-tests.yaml
@@ -68,8 +68,20 @@ jobs:
                 php-version: ${{ matrix.php-version }}
                 tools: flex
 
-            - name: Install root dependencies
-              run: composer install
+            - name: Get Composer Cache Directory
+              id: composer-cache
+              run: |
+                  echo "dir=$(composer config cache-files-dir)" >> $GITHUB_OUTPUT
+
+            - name: Cache packages dependencies
+              uses: actions/cache@v4
+              with:
+                  path: ${{ steps.composer-cache.outputs.dir }}
+                  key: ${{ runner.os }}-composer-packages-${{ matrix.php-version }}-${{ matrix.dependency-version }}-${{ matrix.symfony-version }}-${{ matrix.minimum-stability }}-${{ hashFiles('src/**/composer.json') }}
+                  restore-keys: |
+                      ${{ runner.os }}-composer-packages-${{ matrix.php-version }}-
+
+            - uses: ./.github/actions/install-root-dependencies
 
             - name: Build root packages
               run: php .github/build-packages.php
diff --git a/.github/workflows/ux.symfony.com.yaml b/.github/workflows/ux.symfony.com.yaml
index d9d8a65d681..0f3afc887d2 100644
--- a/.github/workflows/ux.symfony.com.yaml
+++ b/.github/workflows/ux.symfony.com.yaml
@@ -26,14 +26,14 @@ jobs:
                 working-directory: ux.symfony.com
         steps:
             -   uses: actions/checkout@v4
+
             -   uses: shivammathur/setup-php@v2
                 with:
                     php-version: '8.3'
                     tools: php-cs-fixer
-            -   name: Install dependencies
-                uses: ramsey/composer-install@v3
-                with:
-                    working-directory: ux.symfony.com
+
+            -   uses: ./.github/actions/install-website-dependencies
+
             -   name: php-cs-fixer
                 run: php-cs-fixer check --diff
 
@@ -45,13 +45,13 @@ jobs:
                 working-directory: ux.symfony.com
         steps:
             -   uses: actions/checkout@v4
+
             -   uses: shivammathur/setup-php@v2
                 with:
                     php-version: '8.3'
-            -   name: Install dependencies
-                uses: ramsey/composer-install@v3
-                with:
-                    working-directory: ux.symfony.com
+
+            -   uses: ./.github/actions/install-website-dependencies
+
             -   name: twig-cs-fixer
                 run: vendor/bin/twig-cs-fixer lint templates --report=github
 
@@ -63,24 +63,26 @@ jobs:
                 working-directory: ux.symfony.com
         steps:
             -   uses: actions/checkout@v4
+
             -   uses: shivammathur/setup-php@v2
                 with:
                     php-version: '8.3'
-            -   name: Install root dependencies
-                uses: ramsey/composer-install@v3
-                with:
-                    working-directory: ${{ github.workspace }}
+
+            -   uses: ./.github/actions/install-root-dependencies
+
             -   name: Build root packages
                 run: php .github/build-packages.php
                 working-directory: ${{ github.workspace }}
-            -   name: Install dependencies
-                uses: ramsey/composer-install@v3
+
+            -   uses: ./.github/actions/install-website-dependencies
                 with:
-                    working-directory: ux.symfony.com
                     dependency-versions: 'highest'
+
             -   name: Importmap dependencies
                 run: php bin/console importmap:install
+
             -   name: Build Sass assets
                 run: php bin/console sass:build
+
             -   name: Tests
                 run: vendor/bin/phpunit