diff --git a/src/package-managers/yarn.ts b/src/package-managers/yarn.ts
index b947421a..66301aa1 100644
--- a/src/package-managers/yarn.ts
+++ b/src/package-managers/yarn.ts
@@ -295,4 +295,4 @@ export const semver = withNpmConfigFromYarn(npm.semver)
 
 export default spawnYarn
 
-export { getEngines } from './npm'
+export { getEngines, getPeerDependencies, packageAuthorChanged } from './npm'