diff --git a/alfa-client/package.json b/alfa-client/package.json
index b6092d172e2bcc826d3566492a463f7d4cfc2488..2b6783cb2f01950762bc76e0c5fa2851155596a1 100644
--- a/alfa-client/package.json
+++ b/alfa-client/package.json
@@ -173,5 +173,6 @@
   },
   "optionalDependencies": {
     "@rollup/rollup-linux-x64-gnu": "*"
-  }
+  },
+  "packageManager": "pnpm@9.15.0"
 }
\ No newline at end of file