diff --git a/scripts/utils/yarn.ts b/scripts/utils/yarn.ts
index 84d71ece1481..31a96a2f0b2d 100644
--- a/scripts/utils/yarn.ts
+++ b/scripts/utils/yarn.ts
@@ -63,6 +63,10 @@ export const installYarn2 = async ({ cwd, dryRun, debug }: YarnOptions) => {
     `yarn set version berry`,
     `yarn config set enableGlobalCache true`, // Use the global cache so we aren't re-caching dependencies each time we run sandbox
     `yarn config set checksumBehavior ignore`,
+    // Yarn 4.15.0 defaults `npmMinimalAgeGate` to 1d, which quarantines freshly
+    // published Storybook packages from the local Verdaccio registry. Disable
+    // the gate inside sandboxes so installs aren't blocked.
+    `yarn config set npmMinimalAgeGate 0`,
   ];
 
   if (!pnpApiExists) {