diff --git a/ch04/package-lock.json b/ch04/package-lock.json
index 81b2b3a..14bcabe 100644
--- a/ch04/package-lock.json
+++ b/ch04/package-lock.json
@@ -10,7 +10,7 @@
       "dependencies": {
         "@angular/common": "^21.0.0-next.0",
         "@angular/compiler": "^21.0.0-next.0",
-        "@angular/core": "^21.0.0-next.0",
+        "@angular/core": "^21.0.7",
         "@angular/forms": "^21.0.0-next.0",
         "@angular/platform-browser": "^21.0.0-next.0",
         "@angular/router": "^21.0.0-next.0",
@@ -514,9 +514,9 @@
       }
     },
     "node_modules/@angular/core": {
-      "version": "21.0.0-next.5",
-      "resolved": "https://registry.npmjs.org/@angular/core/-/core-21.0.0-next.5.tgz",
-      "integrity": "sha512-lBlMrtC5KqcdXJZUx/p7jSxKHKBPkj57p24b9wRdWfVGCdUUB+NI/kXZhIdECtHpE9FdQbkA7bqyD7y+g1zF2w==",
+      "version": "21.0.7",
+      "resolved": "https://registry.npmjs.org/@angular/core/-/core-21.0.7.tgz",
+      "integrity": "sha512-MvgRRse2PaEleQFp+35rj7ew5gBmBh3wp5yNDYPTiPaVp1I3fJ08VYSpldodaXmdkdWRB+OU4WJhnFkagyRx7A==",
       "license": "MIT",
       "dependencies": {
         "tslib": "^2.3.0"
@@ -525,9 +525,9 @@
         "node": "^20.19.0 || ^22.12.0 || >=24.0.0"
       },
       "peerDependencies": {
-        "@angular/compiler": "21.0.0-next.5",
+        "@angular/compiler": "21.0.7",
         "rxjs": "^6.5.3 || ^7.4.0",
-        "zone.js": "~0.15.0"
+        "zone.js": "~0.15.0 || ~0.16.0"
       },
       "peerDependenciesMeta": {
         "@angular/compiler": {
@@ -3798,6 +3798,13 @@
       "dev": true,
       "license": "MIT"
     },
+    "node_modules/@standard-schema/spec": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/@standard-schema/spec/-/spec-1.1.0.tgz",
+      "integrity": "sha512-l2aFy5jALhniG5HgqrD6jXLi/rUWrKvqN/qJx6yoJsgKhblVd+iqqU4RCXavm/jPityDo5TCvKMnpjKnOriy0w==",
+      "license": "MIT",
+      "peer": true
+    },
     "node_modules/@tufjs/canonical-json": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/@tufjs/canonical-json/-/canonical-json-2.0.0.tgz",
diff --git a/ch04/package.json b/ch04/package.json
index 5a0259d..2dcb1c5 100644
--- a/ch04/package.json
+++ b/ch04/package.json
@@ -25,7 +25,7 @@
   "dependencies": {
     "@angular/common": "^21.0.0-next.0",
     "@angular/compiler": "^21.0.0-next.0",
-    "@angular/core": "^21.0.0-next.0",
+    "@angular/core": "^21.0.7",
     "@angular/forms": "^21.0.0-next.0",
     "@angular/platform-browser": "^21.0.0-next.0",
     "@angular/router": "^21.0.0-next.0",