diff --git a/composer.json b/composer.json
index 3634bf6..12f3a89 100644
--- a/composer.json
+++ b/composer.json
@@ -26,6 +26,9 @@
         "psalm/plugin-phpunit": "^0.18",
         "symfony/browser-kit": "^7.0"
     },
+    "conflict": {
+        "zircote/swagger-php": "=4.8.7"
+    },
     "autoload": {
         "psr-4": {
             "OpenSolid\\OpenApiBundle\\": "src/"