diff --git a/packages/upgrade/package.json b/packages/upgrade/package.json
index 07d7ad0..d846316 100644
--- a/packages/upgrade/package.json
+++ b/packages/upgrade/package.json
@@ -1,7 +1,7 @@
 {
   "name": "yakumo-upgrade",
   "description": "Upgrade package dependencies in a Yakumo workspace",
-  "version": "0.3.3",
+  "version": "0.3.4",
   "main": "lib/index.js",
   "typings": "lib/index.d.ts",
   "files": [
diff --git a/packages/upgrade/src/index.ts b/packages/upgrade/src/index.ts
index 7119e3e..fdd0871 100644
--- a/packages/upgrade/src/index.ts
+++ b/packages/upgrade/src/index.ts
@@ -67,7 +67,7 @@ register('upgrade', async (project) => {
 
   function load(path: string, meta: PackageJson) {
     delete deps[meta.name]
-    for (const type of ['dependencies', 'devDependencies', 'optionalDependencies'] as const) {
+    for (const type of ['dependencies', 'devDependencies', 'peerDependencies', 'optionalDependencies'] as const) {
       for (const key in meta[type] || {}) {
         // skip workspaces and symlinks
         const value = meta[type][key]