diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index fd96b2a..5f6516a 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -22,8 +22,8 @@ jobs:
           php-version: ${{ matrix.php }}
           coverage: none
 
-      - run: php Tests/fix_composer_json.php
-
       - uses: "ramsey/composer-install@v1"
+        with: # ext-rdkafka not needed for tests, and a pain to install on CI;
+          composer-options: "--ignore-platform-req=ext-rdkafka"
 
       - run: vendor/bin/phpunit --exclude-group=functional
diff --git a/Tests/bootstrap.php b/Tests/bootstrap.php
index bf11262..1d4816c 100644
--- a/Tests/bootstrap.php
+++ b/Tests/bootstrap.php
@@ -12,5 +12,8 @@
     }
 }
 
+// Pretend that a high version was installed, opposed to 0.8.5 from kwn/php-rdkafka-stubs
+const RD_KAFKA_VERSION = 42424242;
+
 include_once $kafkaStubsDir.'/stubs/constants.php';
 include_once $kafkaStubsDir.'/stubs/functions.php';
diff --git a/Tests/fix_composer_json.php b/Tests/fix_composer_json.php
deleted file mode 100644
index b778f6f..0000000
--- a/Tests/fix_composer_json.php
+++ /dev/null
@@ -1,9 +0,0 @@
-<?php
-
-copy(__DIR__.'/../composer.json', __DIR__.'/../composer.json.bak');
-
-$composerJson = json_decode(file_get_contents(__DIR__.'/../composer.json'), true);
-
-$composerJson['config']['platform']['ext-rdkafka'] = '3.3';
-
-file_put_contents(__DIR__.'/../composer.json', json_encode($composerJson, JSON_PRETTY_PRINT));