diff --git a/Gemfile.lock b/Gemfile.lock
index d3ecc5e..4eef417 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -30,14 +30,6 @@ GEM
       activemodel (= 4.2.11.1)
       activesupport (= 4.2.11.1)
       arel (~> 6.0)
-    activerecord-jdbc-adapter (50.0)
-      activerecord (>= 2.2)
-    activerecord-jdbcmysql-adapter (50.0)
-      activerecord-jdbc-adapter (~> 50.0)
-      jdbc-mysql (~> 5.1.36)
-    activerecord-jdbcpostgresql-adapter (50.0)
-      activerecord-jdbc-adapter (~> 50.0)
-      jdbc-postgres (>= 9.4, < 43)
     activerecord-session_store (1.1.3)
       actionpack (>= 4.0)
       activerecord (>= 4.0)
@@ -56,7 +48,7 @@ GEM
       descendants_tracker (~> 0.0.4)
       ice_nine (~> 0.11.0)
       thread_safe (~> 0.3, >= 0.3.1)
-    better_errors (2.5.1)
+    better_errors (2.8.0)
       coderay (>= 1.0.0)
       erubi (>= 1.0.0)
       rack (>= 0.9.0)
@@ -67,7 +59,7 @@ GEM
     bullet (6.1.0)
       activesupport (>= 3.0.0)
       uniform_notifier (~> 1.11)
-    coderay (1.1.2)
+    coderay (1.1.3)
     coercible (1.0.0)
       descendants_tracker (~> 0.0.1)
     coffee-rails (4.1.1)
@@ -83,7 +75,7 @@ GEM
       thread_safe (~> 0.3, >= 0.3.1)
     enum_help (0.0.15)
     equalizer (0.0.11)
-    erubi (1.9.0)
+    erubi (1.10.0)
     erubis (2.7.0)
     execjs (2.7.0)
     ffi (1.12.2)
@@ -102,8 +94,6 @@ GEM
     ice_nine (0.11.2)
     jbuilder (2.9.1)
       activesupport (>= 4.2.0)
-    jdbc-mysql (5.1.47)
-    jdbc-postgres (42.2.6)
     jquery-rails (4.3.5)
       rails-dom-testing (>= 1, < 3)
       railties (>= 4.2.0)
@@ -129,13 +119,11 @@ GEM
     minitest (5.14.0)
     mnist (0.1.0)
     multi_json (1.14.1)
-    mysql2 (0.3.21)
     nio4r (2.5.2)
     nio4r (2.5.2-java)
     nokogiri (1.10.9)
       mini_portile2 (~> 2.4.0)
     nokogiri (1.10.9-java)
-    pg (0.18.4)
     pry (0.12.2)
       coderay (~> 1.1.0)
       method_source (~> 0.9.0)
@@ -274,8 +262,6 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  activerecord-jdbcmysql-adapter
-  activerecord-jdbcpostgresql-adapter
   activerecord-session_store
   better_errors
   bootstrap-sass
@@ -291,8 +277,6 @@ DEPENDENCIES
   kaminari (= 0.17.0)
   log4r
   mime-types (< 3)
-  mysql2 (~> 0.3.11)
-  pg (~> 0.18.1)
   pry-doc
   pry-rails
   puma