diff --git a/.github/settings.yml b/.github/settings.yml
index aebfa4c2..99408fa5 100644
--- a/.github/settings.yml
+++ b/.github/settings.yml
@@ -20,18 +20,31 @@ branches:
           - "Dependency Analysis (7.4, locked)"
           - "Label"
           - "Static Code Analysis (7.4, locked)"
-          - "Tests (7.1, highest)"
-          - "Tests (7.1, locked)"
-          - "Tests (7.1, lowest)"
-          - "Tests (7.2, highest)"
-          - "Tests (7.2, locked)"
-          - "Tests (7.2, lowest)"
-          - "Tests (7.3, highest)"
-          - "Tests (7.3, locked)"
-          - "Tests (7.3, lowest)"
-          - "Tests (7.4, highest)"
-          - "Tests (7.4, locked)"
-          - "Tests (7.4, lowest)"
+          - "Static Code Analysis (7.4, locked)"
+          - "Tests (7.1, 1, highest)"
+          - "Tests (7.1, 1, locked)"
+          - "Tests (7.1, 1, lowest)"
+          - "Tests (7.1, 2, highest)"
+          - "Tests (7.1, 2, locked)"
+          - "Tests (7.1, 2, lowest)"
+          - "Tests (7.2, 1, highest)"
+          - "Tests (7.2, 1, locked)"
+          - "Tests (7.2, 1, lowest)"
+          - "Tests (7.2, 2, highest)"
+          - "Tests (7.2, 2, locked)"
+          - "Tests (7.2, 2, lowest)"
+          - "Tests (7.3, 1, highest)"
+          - "Tests (7.3, 1, locked)"
+          - "Tests (7.3, 1, lowest)"
+          - "Tests (7.3, 2, highest)"
+          - "Tests (7.3, 2, locked)"
+          - "Tests (7.3, 2, lowest)"
+          - "Tests (7.4, 1, highest)"
+          - "Tests (7.4, 1, locked)"
+          - "Tests (7.4, 1, lowest)"
+          - "Tests (7.4, 2, highest)"
+          - "Tests (7.4, 2, locked)"
+          - "Tests (7.4, 2, lowest)"
         strict: false
       restrictions:
 
diff --git a/.github/workflows/integrate.yaml b/.github/workflows/integrate.yaml
index 818e6f90..25351123 100644
--- a/.github/workflows/integrate.yaml
+++ b/.github/workflows/integrate.yaml
@@ -226,6 +226,10 @@ jobs:
           - "7.3"
           - "7.4"
 
+        composer-version:
+          - "1"
+          - "2"
+
         dependencies:
           - "lowest"
           - "locked"
@@ -242,6 +246,14 @@ jobs:
           extensions: "${{ env.REQUIRED_PHP_EXTENSIONS }}"
           php-version: "${{ matrix.php-version }}"
 
+      - name: "Install composer:^1"
+        if: "matrix.composer-version == '1'"
+        run: "composer self-update ${{ env.COMPOSER_VERSION }}"
+
+      - name: "Install composer:^2"
+        if: "matrix.composer-version == '2'"
+        run: "composer self-update --snapshot"
+
       - name: "Determine composer cache directory"
         id: "determine-composer-cache-directory"
         run: "echo \"::set-output name=directory::$(composer config cache-dir)\""
diff --git a/composer.json b/composer.json
index cd1ad19e..9e7e9c14 100644
--- a/composer.json
+++ b/composer.json
@@ -18,13 +18,14 @@
   ],
   "require": {
     "php": "^7.1",
-    "composer-plugin-api": "^1.1.0",
+    "composer-plugin-api": "^1.1.0 || ^2.0.0",
     "ergebnis/json-normalizer": "~0.12.0",
     "ergebnis/json-printer": "^3.0.2",
     "localheinz/diff": "^1.0.1"
   },
   "require-dev": {
     "composer/composer": "^1.10.5",
+    "composer/package-versions-deprecated": "^1.8.0",
     "ergebnis/license": "~0.1.0",
     "ergebnis/php-cs-fixer-config": "^2.1.2",
     "ergebnis/phpstan-rules": "~0.14.4",
diff --git a/composer.lock b/composer.lock
index 8b622e9e..c44eebc2 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "cc02c73a0993b62137289efdda877abf",
+    "content-hash": "e56dec9d617c37383b9200979273b981",
     "packages": [
         {
             "name": "ergebnis/json-normalizer",
@@ -4628,7 +4628,7 @@
     "prefer-lowest": false,
     "platform": {
         "php": "^7.1",
-        "composer-plugin-api": "^1.1.0"
+        "composer-plugin-api": "^1.1.0 || ^2.0.0"
     },
     "platform-dev": [],
     "platform-overrides": {
diff --git a/src/NormalizePlugin.php b/src/NormalizePlugin.php
index 02ffd334..fe4f0fbe 100644
--- a/src/NormalizePlugin.php
+++ b/src/NormalizePlugin.php
@@ -27,6 +27,14 @@ public function activate(Composer $composer, IO\IOInterface $io): void
     {
     }
 
+    public function deactivate(Composer $composer, IO\IOInterface $io): void
+    {
+    }
+
+    public function uninstall(Composer $composer, IO\IOInterface $io): void
+    {
+    }
+
     public function getCapabilities(): array
     {
         return [