diff --git a/app/controllers/casino/sessions_controller.rb b/app/controllers/casino/sessions_controller.rb
index 50c77ad4..5f9ea1d7 100644
--- a/app/controllers/casino/sessions_controller.rb
+++ b/app/controllers/casino/sessions_controller.rb
@@ -23,7 +23,7 @@ def new
   def create
     validation_result = validate_login_credentials(params[:username], params[:password])
     if !validation_result
-      log_failed_login params[:username]
+      handle_failed_login params[:username]
       show_login_error I18n.t('login_credential_acceptor.invalid_login_credentials')
     else
       sign_in(validation_result, long_term: params[:rememberMe], credentials_supplied: true)
diff --git a/app/helpers/casino/sessions_helper.rb b/app/helpers/casino/sessions_helper.rb
index 13d27d74..5d6cf574 100644
--- a/app/helpers/casino/sessions_helper.rb
+++ b/app/helpers/casino/sessions_helper.rb
@@ -4,6 +4,8 @@ module CASino::SessionsHelper
   include CASino::TicketGrantingTicketProcessor
   include CASino::ServiceTicketProcessor
 
+  LOCK_TIMEOUT = 5.minutes
+
   def current_ticket_granting_ticket?(ticket_granting_ticket)
     ticket_granting_ticket.ticket == cookies[:tgt]
   end
@@ -51,9 +53,10 @@ def sign_out
     cookies.delete :tgt
   end
 
-  def log_failed_login(username)
+  def handle_failed_login(username)
     CASino::User.where(username: username).each do |user|
       create_login_attempt(user, false)
+      lock_user(user) if user.max_failed_logins_reached?(CASino.config.max_failed_login_attempts)
     end
   end
 
@@ -91,4 +94,8 @@ def handle_signed_in_with_service(tgt, options)
       redirect_to url, status: :see_other
     end
   end
+
+  def lock_user(user)
+    user.update locked_until: LOCK_TIMEOUT.from_now
+  end
 end
diff --git a/app/models/casino/login_attempt.rb b/app/models/casino/login_attempt.rb
index 73ca13ca..b4477635 100644
--- a/app/models/casino/login_attempt.rb
+++ b/app/models/casino/login_attempt.rb
@@ -2,4 +2,8 @@ class CASino::LoginAttempt < ActiveRecord::Base
   include CASino::ModelConcern::BrowserInfo
 
   belongs_to :user
+
+  def failed?
+    !successful?
+  end
 end
diff --git a/app/models/casino/user.rb b/app/models/casino/user.rb
index 2bd2a72b..b110d02c 100644
--- a/app/models/casino/user.rb
+++ b/app/models/casino/user.rb
@@ -9,4 +9,14 @@ class CASino::User < ActiveRecord::Base
   def active_two_factor_authenticator
     self.two_factor_authenticators.where(active: true).first
   end
+
+  def locked?
+    return false unless locked_until
+    locked_until.future?
+  end
+
+  def max_failed_logins_reached?(max)
+    max ||= 5
+    login_attempts.last(max).count(&:failed?) == max
+  end
 end
diff --git a/db/migrate/20160810113208_add_locked_until_to_users.rb b/db/migrate/20160810113208_add_locked_until_to_users.rb
new file mode 100644
index 00000000..085b184e
--- /dev/null
+++ b/db/migrate/20160810113208_add_locked_until_to_users.rb
@@ -0,0 +1,5 @@
+class AddLockedUntilToUsers < ActiveRecord::Migration
+  def change
+    add_column :casino_users, :locked_until, :datetime
+  end
+end
diff --git a/spec/controllers/sessions_controller_spec.rb b/spec/controllers/sessions_controller_spec.rb
index 79ecb3f8..264898c0 100644
--- a/spec/controllers/sessions_controller_spec.rb
+++ b/spec/controllers/sessions_controller_spec.rb
@@ -208,6 +208,24 @@
           expect(CASino::LoginAttempt.last.user).to eq user
           expect(CASino::LoginAttempt.last.successful).to eq false
         end
+
+        it 'does not lock the user' do
+          expect do
+            post :create, params
+          end.to_not change { user.reload.locked? }
+        end
+
+        context 'when the maximum of failed login attempts is reached' do
+          before do
+            allow(CASino.config).to receive(:max_failed_login_attempts).and_return(1)
+          end
+
+          it 'deactivates the user' do
+            expect do
+              post :create, params
+            end.to change { user.reload.locked? }.from(false).to(true)
+          end
+        end
       end
 
       context 'with valid credentials' do
diff --git a/spec/dummy/db/migrate/20160810122605_add_locked_until_to_users.casino.rb b/spec/dummy/db/migrate/20160810122605_add_locked_until_to_users.casino.rb
new file mode 100644
index 00000000..a09eea44
--- /dev/null
+++ b/spec/dummy/db/migrate/20160810122605_add_locked_until_to_users.casino.rb
@@ -0,0 +1,6 @@
+# This migration comes from casino (originally 20160810113208)
+class AddLockedUntilToUsers < ActiveRecord::Migration
+  def change
+    add_column :casino_users, :locked_until, :datetime
+  end
+end
diff --git a/spec/dummy/db/schema.rb b/spec/dummy/db/schema.rb
index 8cbc2295..57bb4f29 100644
--- a/spec/dummy/db/schema.rb
+++ b/spec/dummy/db/schema.rb
@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20160502074450) do
+ActiveRecord::Schema.define(version: 20160810122605) do
 
   create_table "casino_auth_token_tickets", force: true do |t|
     t.string   "ticket",     null: false
@@ -119,6 +119,7 @@
     t.text     "extra_attributes"
     t.datetime "created_at"
     t.datetime "updated_at"
+    t.datetime "locked_until"
   end
 
   add_index "casino_users", ["authenticator", "username"], name: "index_casino_users_on_authenticator_and_username", unique: true
diff --git a/spec/model/login_attempt_spec.rb b/spec/model/login_attempt_spec.rb
index 2fe7af25..42d95535 100644
--- a/spec/model/login_attempt_spec.rb
+++ b/spec/model/login_attempt_spec.rb
@@ -4,4 +4,16 @@
   subject { described_class.new user_agent: 'TestBrowser' }
 
   it_behaves_like 'has browser info'
+
+  describe '#failed?' do
+    it 'is true when it is not successful' do
+      login_attempt = FactoryGirl.create :login_attempt, successful: false
+      expect(login_attempt).to be_failed
+    end
+
+    it 'is false when it is successful' do
+      login_attempt = FactoryGirl.create :login_attempt, successful: true
+      expect(login_attempt).to_not be_failed
+    end
+  end
 end
diff --git a/spec/model/user_spec.rb b/spec/model/user_spec.rb
new file mode 100644
index 00000000..3bfcd54e
--- /dev/null
+++ b/spec/model/user_spec.rb
@@ -0,0 +1,63 @@
+require 'spec_helper'
+
+RSpec.describe CASino::User do
+  let(:user) { FactoryGirl.create :user }
+
+  describe '#locked?' do
+    it 'is true when locked_until is in the future' do
+      user = FactoryGirl.create :user, locked_until: 1.hour.from_now
+      expect(user).to be_locked
+    end
+
+    it 'is false when locked_until is in the past' do
+      user = FactoryGirl.create :user, locked_until: 1.hour.ago
+      expect(user).to_not be_locked
+    end
+
+    it 'is false when locked_until is empty' do
+      user = FactoryGirl.create :user, locked_until: nil
+      expect(user).to_not be_locked
+    end
+  end
+
+  describe '#max_failed_logins_reached?' do
+    let(:max_failed_attempts) { 2 }
+
+    subject { user.max_failed_logins_reached?(max_failed_attempts) }
+
+    context 'when the user has no login attempts' do
+      it { is_expected.to eq false }
+    end
+
+    context 'when the user has only successful logins' do
+      it { is_expected.to eq false }
+    end
+
+    context 'when the maximum of attempts is reached' do
+      before { FactoryGirl.create_list :login_attempt, 2, successful: false, user: user }
+
+      context 'in a row' do
+        it { is_expected.to eq true }
+      end
+
+      context 'but the last attempt was successful' do
+        before { FactoryGirl.create :login_attempt, successful: true, user: user }
+        it { is_expected.to eq false }
+      end
+
+      context 'but a successful between' do
+        before do
+          FactoryGirl.create :login_attempt, successful: true, user: user
+          FactoryGirl.create :login_attempt, successful: false, user: user
+        end
+
+        it { is_expected.to eq false }
+      end
+    end
+
+    context 'when the user has less then the maximum failed attempts' do
+      before { FactoryGirl.create :login_attempt, successful: false, user: user }
+      it { is_expected.to eq false }
+    end
+  end
+end