diff --git a/ruby-projects/sample_blog/Gemfile.lock b/ruby-projects/sample_blog/Gemfile.lock
index 6db32bd..fa1f164 100644
--- a/ruby-projects/sample_blog/Gemfile.lock
+++ b/ruby-projects/sample_blog/Gemfile.lock
@@ -1,34 +1,32 @@
 GEM
   remote: https://rubygems.org/
   specs:
-    activemodel (4.1.8)
-      activesupport (= 4.1.8)
-      builder (~> 3.1)
-    activerecord (4.1.8)
-      activemodel (= 4.1.8)
-      activesupport (= 4.1.8)
-      arel (~> 5.0.0)
-    activesupport (4.1.8)
-      i18n (~> 0.6, >= 0.6.9)
-      json (~> 1.7, >= 1.7.7)
+    activemodel (5.2.8.1)
+      activesupport (= 5.2.8.1)
+    activerecord (5.2.8.1)
+      activemodel (= 5.2.8.1)
+      activesupport (= 5.2.8.1)
+      arel (>= 9.0)
+    activesupport (5.2.8.1)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (>= 0.7, < 2)
       minitest (~> 5.1)
-      thread_safe (~> 0.1)
       tzinfo (~> 1.1)
-    arel (5.0.1.20140414130214)
+    arel (9.0.0)
     bcrypt (3.1.9)
-    builder (3.2.2)
+    concurrent-ruby (1.1.10)
     haml (4.0.6)
       tilt
     http_router (0.11.1)
       rack (>= 1.0.0)
       url_mount (~> 0.2.1)
-    i18n (0.6.11)
-    json (1.8.1)
+    i18n (0.9.5)
+      concurrent-ruby (~> 1.0)
     mail (2.5.4)
       mime-types (~> 1.16)
       treetop (~> 1.4.8)
     mime-types (1.25.1)
-    minitest (5.4.3)
+    minitest (5.16.2)
     moneta (0.7.20)
     padrino (0.12.4)
       padrino-admin (= 0.12.4)
@@ -64,6 +62,7 @@ GEM
       padrino-core (= 0.12.4)
     padrino-support (0.12.4)
       activesupport (>= 3.1)
+    pg (1.4.1)
     polyglot (0.3.5)
     rack (1.5.2)
     rack-protection (1.5.3)
@@ -82,14 +81,13 @@ GEM
       rack (~> 1.4)
       rack-protection (~> 1.4)
       tilt (~> 1.3, >= 1.3.4)
-    sqlite3 (1.3.10)
     thor (0.19.1)
-    thread_safe (0.3.4)
+    thread_safe (0.3.6)
     tilt (1.4.1)
     treetop (1.4.15)
       polyglot
       polyglot (>= 0.3.1)
-    tzinfo (1.2.2)
+    tzinfo (1.2.9)
       thread_safe (~> 0.1)
     url_mount (0.2.1)
       rack
@@ -102,8 +100,8 @@ DEPENDENCIES
   bcrypt
   haml
   padrino (= 0.12.4)
+  pg
   rack-test
   rake
   sass
   shoulda
-  sqlite3