diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7e75d7a..df21779 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,19 @@
+## 6.6.0 - 2019/01/29
+
+### Features
+
+* 6.6.0  as default Elasticsearch version
+* [#521](https://github.com/elastic/ansible-elasticsearch/pull/521) - @Crazybus - Allow switching between oss and standard packages
+* [#528](https://github.com/elastic/ansible-elasticsearch/pull/528) - @Fra-nk - Use systemd's RequiresMountsFor
+* [#530](https://github.com/elastic/ansible-elasticsearch/pull/530) - @lde - Use dpkg_selections to lock elasticsearch version
+
+### Fixes
+
+* [#513](https://github.com/elastic/ansible-elasticsearch/pull/513) - @kakoni - Fix typo in elasticsearch-parameters.yml
+* [#522](https://github.com/elastic/ansible-elasticsearch/pull/522) - @SlothOfAnarchy - Fix package download URL
+* [#526](https://github.com/elastic/ansible-elasticsearch/pull/527) - @Fra-nk - Allow not installing Elasticsearch deb repository key
+* [#527](https://github.com/elastic/ansible-elasticsearch/pull/527) - @katsukamaru - Execute java version check in check mode
+
 ## 6.5.1.1 - 2018/11/27
 
 ### Fixes
diff --git a/defaults/main.yml b/defaults/main.yml
index 91177cb..4b35fde 100644
--- a/defaults/main.yml
+++ b/defaults/main.yml
@@ -1,6 +1,6 @@
 ---
 es_major_version: "6.x"
-es_version: "6.5.1"
+es_version: "6.6.0"
 es_use_snapshot_release: false
 es_enable_xpack: true
 es_package_name: "elasticsearch"
diff --git a/tasks/compatibility-variables.yml b/tasks/compatibility-variables.yml
index b5cf31c..d37468d 100644
--- a/tasks/compatibility-variables.yml
+++ b/tasks/compatibility-variables.yml
@@ -14,6 +14,9 @@
     es_xpack_conf_subdir: ""
     es_repo_name: "{{ es_major_version }}"
     es_xpack_users_command: "elasticsearch-users"
+    es_other_package_name: "elasticsearch-oss"
+    es_other_repo_name: "{{ 'oss-' + es_major_version }}"
+    es_other_apt_url: "deb https://artifacts.elastic.co/packages/{{ 'oss-' + es_major_version }}/apt stable main"
 
 - name: Detect if es_version is before X-Pack was open and included
   set_fact:
@@ -32,7 +35,10 @@
 - name: Use the oss repo and package if xpack is not being used
   set_fact:
     es_repo_name: "{{ 'oss-' + es_major_version }}"
+    es_other_repo_name: "{{ es_major_version }}"
+    es_other_apt_url: "deb https://artifacts.elastic.co/packages/{{ es_major_version }}/apt stable main"
     es_package_name: "elasticsearch-oss"
+    es_other_package_name: "elasticsearch"
   when:
     - es_open_xpack
     - not es_enable_xpack
diff --git a/tasks/elasticsearch-Debian-version-lock.yml b/tasks/elasticsearch-Debian-version-lock.yml
index 4ca9b24..6d52493 100644
--- a/tasks/elasticsearch-Debian-version-lock.yml
+++ b/tasks/elasticsearch-Debian-version-lock.yml
@@ -1,6 +1,6 @@
 ---
 - name: Debian - hold elasticsearch version
   become: yes
-  command: "apt-mark hold {{ es_package_name }}"
-  register: hold_elasticsearch_result
-  changed_when: "hold_elasticsearch_result.stdout != '{{ es_package_name }} was already set on hold.'"
+  dpkg_selections:
+    name: "{{ es_package_name }}"
+    selection: "hold"
diff --git a/tasks/elasticsearch-Debian.yml b/tasks/elasticsearch-Debian.yml
index fc2bcec..7b9a735 100644
--- a/tasks/elasticsearch-Debian.yml
+++ b/tasks/elasticsearch-Debian.yml
@@ -7,49 +7,53 @@
   set_fact: force_install=yes
   when: es_allow_downgrades
 
-- name: Debian - Install apt-transport-https to support https APT downloads
+- name: Gracefully stop and remove elasticsearch package if switching between OSS and standard
   become: yes
-  apt: name=apt-transport-https state=present
-  when: es_use_repository
-
-- name: Debian - Add Elasticsearch repository key
-  become: yes
-  apt_key: url="{{ es_apt_key }}" state=present
-  when: es_use_repository and es_apt_key
-
-- name: Debian - Add elasticsearch repository
-  become: yes
-  apt_repository: repo={{ item.repo }} state={{ item.state}}
-  with_items:
-    - { repo: "{{ es_apt_url_old }}", state: "absent" }
-    - { repo: "{{ es_apt_url }}", state: "present" }
-  when: es_use_repository
-
-
-- name: Gracefully stop and remove elasticsearch if we are switching to the oss version
-  when:
-    - es_package_name == 'elasticsearch-oss'
   block:
   - name: Check if the elasticsearch package is installed
-    shell: dpkg-query -W -f'${Status}' elasticsearch
+    shell: "dpkg-query -W -f'${Status}' {{ es_other_package_name }}"
     register: elasticsearch_package
     failed_when: False
     changed_when: False
 
   - name: stop elasticsearch
-    become: yes
     service:
       name: '{{ instance_init_script | basename }}'
       state: stopped
     when: elasticsearch_package.stdout == 'install ok installed'
 
-  - name: Debian - Remove elasticsearch package if we are installing the oss package
-    become: yes
+  - name: Debian - Remove elasticsearch package if we are switching to a different package type
     apt:
-      name: 'elasticsearch'
+      name: '{{ es_other_package_name }}'
       state: absent
     when: elasticsearch_package.stdout == 'install ok installed'
 
+
+- name: Install Elasticsearch repository
+  when: es_use_repository
+  become: yes
+  block:
+  - name: Debian - Install apt-transport-https to support https APT downloads
+    apt:
+      name: apt-transport-https
+      state: present
+
+  - name: Debian - Add Elasticsearch repository key
+    apt_key:
+      url: '{{ es_apt_key }}'
+      state: present
+    when: es_apt_key | string
+
+  - name: Debian - Add elasticsearch repository
+    apt_repository:
+      repo: '{{ item.repo }}'
+      state: '{{ item.state }}'
+    with_items:
+      - { repo: "{{ es_apt_url_old }}", state: "absent" }
+      - { repo: "{{ es_apt_url }}", state: "present" }
+      - { repo: "{{ es_other_apt_url }}", state: "absent" }
+
+
 - name: Debian - Ensure elasticsearch is installed
   become: yes
   apt:
diff --git a/tasks/elasticsearch-RedHat.yml b/tasks/elasticsearch-RedHat.yml
index a57ab71..c872fc3 100644
--- a/tasks/elasticsearch-RedHat.yml
+++ b/tasks/elasticsearch-RedHat.yml
@@ -13,19 +13,27 @@
 
 - name: RedHat - add Elasticsearch repo
   become: yes
-  template: src=elasticsearch.repo dest=/etc/yum.repos.d/elasticsearch-{{ es_repo_name }}.repo
+  template:
+    src: 'elasticsearch.repo'
+    dest: '/etc/yum.repos.d/elasticsearch-{{ es_repo_name }}.repo'
+  when: es_use_repository
+
+- name: RedHat - remove unused Elasticsearch repo
+  become: yes
+  file:
+    path: '/etc/yum.repos.d/elasticsearch-{{ es_other_repo_name }}.repo'
+    state: absent
   when: es_use_repository
 
 - name: RedHat - include versionlock
   include: elasticsearch-RedHat-version-lock.yml
   when: es_version_lock
 
-- name: RedHat - Remove non oss package if the old elasticsearch package is installed
+- name: RedHat - Remove the other elasticsearch package if switching between OSS and standard
   become: yes
   yum:
-    name: 'elasticsearch'
+    name: '{{ es_other_package_name }}'
     state: 'absent'
-  when: es_package_name == 'elasticsearch-oss'
 
 - name: RedHat - Install Elasticsearch
   become: yes
diff --git a/tasks/elasticsearch-parameters.yml b/tasks/elasticsearch-parameters.yml
index dc8a177..df1ba0e 100644
--- a/tasks/elasticsearch-parameters.yml
+++ b/tasks/elasticsearch-parameters.yml
@@ -71,5 +71,5 @@
   set_fact: pid_dir={{ es_pid_dir }}/{{instance_suffix}}
 - name: set fact log_dir
   set_fact: log_dir={{ es_log_dir }}/{{instance_suffix}}
-- name: set fact log_dir
+- name: set fact data_dirs
   set_fact: data_dirs={{ es_data_dirs | append_to_list('/'+instance_suffix) }}
diff --git a/tasks/java.yml b/tasks/java.yml
index a7174da..68abc53 100644
--- a/tasks/java.yml
+++ b/tasks/java.yml
@@ -18,6 +18,7 @@
   register: java_full_path
   failed_when: False
   changed_when: False
+  check_mode: no
   when: ansible_os_family == 'RedHat'
 
 - name: correct java version selected
diff --git a/templates/systemd/elasticsearch.j2 b/templates/systemd/elasticsearch.j2
index a1747d0..cd7366b 100644
--- a/templates/systemd/elasticsearch.j2
+++ b/templates/systemd/elasticsearch.j2
@@ -3,6 +3,8 @@ Description=Elasticsearch-{{es_instance_name}}
 Documentation=http://www.elastic.co
 Wants=network-online.target
 After=network-online.target
+{# Directive 'WorkingDirectory' creates an implicit dependecy for {{es_home}}, so it can be omitted here #}
+RequiresMountsFor={{ data_dirs | array_to_str(separator=' ') }} {{log_dir}} {{pid_dir}} {{conf_dir}}
 
 [Service]
 Environment=ES_HOME={{es_home}}
diff --git a/test/integration/helpers/serverspec/shared_spec.rb b/test/integration/helpers/serverspec/shared_spec.rb
index d707cde..eca6682 100644
--- a/test/integration/helpers/serverspec/shared_spec.rb
+++ b/test/integration/helpers/serverspec/shared_spec.rb
@@ -167,4 +167,29 @@ shared_examples 'shared::init' do |vars|
     its(:content) { should match "path.data: #{vars['data_dirs'].join(',')}" }
     its(:content) { should match "path.logs: /var/log/elasticsearch/localhost-#{vars['es_instance_name']}" }
   end
+
+  if vars['es_use_repository']
+    if vars['ansible_os_family'] == 'RedHat'
+      describe file("/etc/yum.repos.d/elasticsearch-#{vars['es_repo_name']}.repo") do
+        it { should exist }
+      end
+      describe yumrepo("elasticsearch-#{vars['es_repo_name']}") do
+        it { should exist }
+        it { should be_enabled }
+      end
+      describe file("/etc/yum.repos.d/elasticsearch-#{vars['es_other_repo_name']}.repo") do
+        it { should_not exist }
+      end
+      describe yumrepo("elasticsearch-#{vars['es_other_repo_name']}") do
+        it { should_not exist }
+        it { should_not be_enabled }
+      end
+    end
+    if vars['ansible_os_family'] == 'Debian'
+      describe command('apt-cache policy') do
+        its(:stdout) { should match /elastic.co.*\/#{Regexp.quote(vars['es_repo_name'])}\//}
+        its(:stdout) { should_not match /elastic.co.*\/#{Regexp.quote(vars['es_other_repo_name'])}\//}
+      end
+    end
+  end
 end