diff --git a/Gemfile b/Gemfile
index d143d53..b83fdb6 100644
--- a/Gemfile
+++ b/Gemfile
@@ -11,7 +11,7 @@ gem 'jquery-rails'
 # postgres
 gem 'pg'
 # Use Puma as the app server
-gem 'puma', '~> 3.11'
+gem 'puma', '~> 3.12'
 # Use SCSS for stylesheets
 gem 'sass-rails', '~> 5.0'
 # Use Uglifier as compressor for JavaScript assets
diff --git a/Gemfile.lock b/Gemfile.lock
index 74c3358..da25d71 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -89,6 +89,7 @@ GEM
       warden (~> 1.2.3)
     erubi (1.8.0)
     execjs (2.7.0)
+    ffi (1.11.1)
     ffi (1.11.1-x64-mingw32)
     globalid (0.4.2)
       activesupport (>= 4.2.0)
@@ -113,15 +114,19 @@ GEM
     mini_mime (1.0.2)
     mini_portile2 (2.4.0)
     minitest (5.11.3)
+    msgpack (1.3.0)
     msgpack (1.3.0-x64-mingw32)
     nio4r (2.4.0)
+    nokogiri (1.10.3)
+      mini_portile2 (~> 2.4.0)
     nokogiri (1.10.3-x64-mingw32)
       mini_portile2 (~> 2.4.0)
     orm_adapter (0.5.0)
+    pg (1.1.4)
     pg (1.1.4-x64-mingw32)
     popper_js (1.14.5)
     public_suffix (3.1.1)
-    puma (3.12.1)
+    puma (3.12.4)
     rack (2.0.7)
     rack-test (1.1.0)
       rack (>= 1.0, < 3)
@@ -188,7 +193,6 @@ GEM
       actionpack (>= 4.0)
       activesupport (>= 4.0)
       sprockets (>= 3.0.0)
-    sqlite3 (1.4.1)
     thor (0.20.3)
     thread_safe (0.3.6)
     tilt (2.0.9)
@@ -215,6 +219,7 @@ GEM
       nokogiri (~> 1.8)
 
 PLATFORMS
+  ruby
   x64-mingw32
 
 DEPENDENCIES
@@ -228,11 +233,10 @@ DEPENDENCIES
   jbuilder (~> 2.5)
   jquery-rails
   pg
-  puma (~> 3.11)
+  puma (~> 3.12)
   rails (~> 5.2.3)
   sass-rails (~> 5.0)
   selenium-webdriver
-  sqlite3
   turbolinks (~> 5)
   tzinfo-data
   uglifier (>= 1.3.0)