diff --git a/firebase-get-to-know-flutter/step_04/pubspec.lock b/firebase-get-to-know-flutter/step_04/pubspec.lock
index 5072d2cd61..acfd090fa1 100644
--- a/firebase-get-to-know-flutter/step_04/pubspec.lock
+++ b/firebase-get-to-know-flutter/step_04/pubspec.lock
@@ -205,10 +205,10 @@ packages:
     dependency: "direct main"
     description:
       name: firebase_core
-      sha256: "5fbbaa2aeb08a52feee559f92a62f5a6b04c9bdff81c8f608636771cf0d7b680"
+      sha256: "253da727a1eb7ed91a72cb4eb4a1b6db6993e04c228c2dcfa9e573901c252e35"
       url: "https://pub.dev"
     source: hosted
-    version: "4.15.0"
+    version: "4.15.2"
   firebase_core_platform_interface:
     dependency: transitive
     description:
diff --git a/firebase-get-to-know-flutter/step_05/pubspec.lock b/firebase-get-to-know-flutter/step_05/pubspec.lock
index 5072d2cd61..acfd090fa1 100644
--- a/firebase-get-to-know-flutter/step_05/pubspec.lock
+++ b/firebase-get-to-know-flutter/step_05/pubspec.lock
@@ -205,10 +205,10 @@ packages:
     dependency: "direct main"
     description:
       name: firebase_core
-      sha256: "5fbbaa2aeb08a52feee559f92a62f5a6b04c9bdff81c8f608636771cf0d7b680"
+      sha256: "253da727a1eb7ed91a72cb4eb4a1b6db6993e04c228c2dcfa9e573901c252e35"
       url: "https://pub.dev"
     source: hosted
-    version: "4.15.0"
+    version: "4.15.2"
   firebase_core_platform_interface:
     dependency: transitive
     description:
diff --git a/firebase-get-to-know-flutter/step_06/pubspec.lock b/firebase-get-to-know-flutter/step_06/pubspec.lock
index 5072d2cd61..acfd090fa1 100644
--- a/firebase-get-to-know-flutter/step_06/pubspec.lock
+++ b/firebase-get-to-know-flutter/step_06/pubspec.lock
@@ -205,10 +205,10 @@ packages:
     dependency: "direct main"
     description:
       name: firebase_core
-      sha256: "5fbbaa2aeb08a52feee559f92a62f5a6b04c9bdff81c8f608636771cf0d7b680"
+      sha256: "253da727a1eb7ed91a72cb4eb4a1b6db6993e04c228c2dcfa9e573901c252e35"
       url: "https://pub.dev"
     source: hosted
-    version: "4.15.0"
+    version: "4.15.2"
   firebase_core_platform_interface:
     dependency: transitive
     description:
diff --git a/firebase-get-to-know-flutter/step_07/pubspec.lock b/firebase-get-to-know-flutter/step_07/pubspec.lock
index 5072d2cd61..acfd090fa1 100644
--- a/firebase-get-to-know-flutter/step_07/pubspec.lock
+++ b/firebase-get-to-know-flutter/step_07/pubspec.lock
@@ -205,10 +205,10 @@ packages:
     dependency: "direct main"
     description:
       name: firebase_core
-      sha256: "5fbbaa2aeb08a52feee559f92a62f5a6b04c9bdff81c8f608636771cf0d7b680"
+      sha256: "253da727a1eb7ed91a72cb4eb4a1b6db6993e04c228c2dcfa9e573901c252e35"
       url: "https://pub.dev"
     source: hosted
-    version: "4.15.0"
+    version: "4.15.2"
   firebase_core_platform_interface:
     dependency: transitive
     description:
diff --git a/firebase-get-to-know-flutter/step_09/pubspec.lock b/firebase-get-to-know-flutter/step_09/pubspec.lock
index 5072d2cd61..acfd090fa1 100644
--- a/firebase-get-to-know-flutter/step_09/pubspec.lock
+++ b/firebase-get-to-know-flutter/step_09/pubspec.lock
@@ -205,10 +205,10 @@ packages:
     dependency: "direct main"
     description:
       name: firebase_core
-      sha256: "5fbbaa2aeb08a52feee559f92a62f5a6b04c9bdff81c8f608636771cf0d7b680"
+      sha256: "253da727a1eb7ed91a72cb4eb4a1b6db6993e04c228c2dcfa9e573901c252e35"
       url: "https://pub.dev"
     source: hosted
-    version: "4.15.0"
+    version: "4.15.2"
   firebase_core_platform_interface:
     dependency: transitive
     description: