diff --git a/Chapter12/Activity12.01/blog/Gemfile.lock b/Chapter12/Activity12.01/blog/Gemfile.lock
index 2f40482..11a4cab 100644
--- a/Chapter12/Activity12.01/blog/Gemfile.lock
+++ b/Chapter12/Activity12.01/blog/Gemfile.lock
@@ -42,8 +42,8 @@ GEM
       i18n (>= 0.7, < 2)
       minitest (~> 5.1)
       tzinfo (~> 1.1)
-    addressable (2.7.0)
-      public_suffix (>= 2.0.2, < 5.0)
+    addressable (2.8.1)
+      public_suffix (>= 2.0.2, < 6.0)
     arel (9.0.0)
     bindex (0.8.1)
     builder (3.2.3)
@@ -88,7 +88,9 @@ GEM
     marcel (0.3.3)
       mimemagic (~> 0.3.2)
     method_source (0.9.2)
-    mimemagic (0.3.3)
+    mimemagic (0.3.10)
+      nokogiri (~> 1)
+      rake
     mini_mime (1.0.2)
     mini_portile2 (2.4.0)
     minitest (5.11.3)
@@ -96,7 +98,7 @@ GEM
     nokogiri (1.10.4)
       mini_portile2 (~> 2.4.0)
     pg (1.1.4)
-    public_suffix (4.0.1)
+    public_suffix (5.0.0)
     puma (3.12.1)
     rack (2.0.7)
     rack-test (1.1.0)