diff --git a/README.md b/README.md
index f6b7817..66fc85a 100644
--- a/README.md
+++ b/README.md
@@ -24,7 +24,7 @@ All variables which can be overridden are stored in [defaults/main.yml](defaults
 
 | Name           | Default Value | Description                        |
 | -------------- | ------------- | -----------------------------------|
-| `alertmanager_version` | 0.15.2 | Alermanager package version |
+| `alertmanager_version` | 0.16.1 | Alertmanager package version |
 | `alertmanager_listen_address` | '0.0.0.0:9093' | Address on which alertmanager will be listening |
 | `alertmanager_external_url` | 'http://localhost:9093/' | External address on which alertmanager is available. Useful when behind reverse proxy. Ex. example.org/alertmanager |
 | `alertmanager_config_dir` | /etc/alertmanager | Path to directory with alertmanager configuration |
diff --git a/defaults/main.yml b/defaults/main.yml
index 66c036f..9e29d3f 100644
--- a/defaults/main.yml
+++ b/defaults/main.yml
@@ -1,5 +1,5 @@
 ---
-alertmanager_version: 0.15.3
+alertmanager_version: 0.16.1
 
 alertmanager_config_dir: /etc/alertmanager
 alertmanager_db_dir: /var/lib/alertmanager
@@ -50,7 +50,6 @@ alertmanager_receivers: []
 #   - name: slack
 #     slack_configs:
 #       - send_resolved: true
-#         api_url: $slack_api_url
 #         channel: '#alerts'
 
 alertmanager_inhibit_rules: []
diff --git a/molecule/alternative/playbook.yml b/molecule/alternative/playbook.yml
index 569c68e..f87c8ba 100644
--- a/molecule/alternative/playbook.yml
+++ b/molecule/alternative/playbook.yml
@@ -14,7 +14,7 @@
       - name: slack
         slack_configs:
           - send_resolved: true
-            api_url: $slack_api_url
+            api_url: 'https://hooks.slack.com/services/T00000000/B00000000/XXXXXXXXXXXXXXXXXXXXXXXX'
             channel: '#alerts'
     alertmanager_route:
       group_by: ['alertname', 'cluster', 'service']
diff --git a/molecule/default/playbook.yml b/molecule/default/playbook.yml
index 15a668b..c896377 100644
--- a/molecule/default/playbook.yml
+++ b/molecule/default/playbook.yml
@@ -9,7 +9,6 @@
       - name: slack
         slack_configs:
           - send_resolved: true
-            api_url: $slack_api_url
             channel: '#alerts'
     alertmanager_route:
       group_by: ['alertname', 'cluster', 'service']
diff --git a/templates/alertmanager.yml.j2 b/templates/alertmanager.yml.j2
index 036df6a..9b194f9 100644
--- a/templates/alertmanager.yml.j2
+++ b/templates/alertmanager.yml.j2
@@ -1,50 +1,50 @@
 {{ ansible_managed | comment }}
 
 global:
-  resolve_timeout: {{ alertmanager_resolve_timeout }}
+  resolve_timeout: {{ alertmanager_resolve_timeout | quote}}
 {% for key, value in alertmanager_smtp.items() %}
-  smtp_{{ key }}: {{ value }}
+  smtp_{{ key }}: {{ value | quote }}
 {% endfor %}
-{% if alertmanager_slack_api_url != '' %}
-  slack_api_url: {{ alertmanager_slack_api_url }}
+{% if alertmanager_slack_api_url | length %}
+  slack_api_url: {{ alertmanager_slack_api_url | quote }}
 {% endif %}
-{% if alertmanager_pagerduty_url != '' %}
-  pagerduty_url: {{ alertmanager_pagerduty_url }}
+{% if alertmanager_pagerduty_url | length %}
+  pagerduty_url: {{ alertmanager_pagerduty_url | quote }}
 {% endif %}
-{% if alertmanager_opsgenie_api_key != '' %}
-  opsgenie_api_key: {{ alertmanager_opsgenie_api_key }}
+{% if alertmanager_opsgenie_api_key | length %}
+  opsgenie_api_key: {{ alertmanager_opsgenie_api_key | quote }}
 {% endif %}
-{% if alertmanager_opsgenie_api_url != '' %}
-  opsgenie_api_url: {{ alertmanager_opsgenie_api_url }}
+{% if alertmanager_opsgenie_api_url | length %}
+  opsgenie_api_url: {{ alertmanager_opsgenie_api_url | quote }}
 {% endif %}
-{% if alertmanager_hipchat_api_url != '' %}
-  hipchat_api_url: {{ alertmanager_hipchat_api_url }}
+{% if alertmanager_hipchat_api_url | length %}
+  hipchat_api_url: {{ alertmanager_hipchat_api_url | quote }}
 {% endif %}
-{% if alertmanager_hipchat_auth_token != '' %}
-  hipchat_auth_token: {{ alertmanager_hipchat_auth_token }}
+{% if alertmanager_hipchat_auth_token | length %}
+  hipchat_auth_token: {{ alertmanager_hipchat_auth_token | quote }}
 {% endif %}
-{% if alertmanager_wechat_url != '' %}
-  wechat_api_url: {{ alertmanager_wechat_url }}
+{% if alertmanager_wechat_url | length %}
+  wechat_api_url: {{ alertmanager_wechat_url | quote }}
 {% endif %}
-{% if alertmanager_wechat_secret != '' %}
-  wechat_api_secret: {{ alertmanager_wechat_secret }}
+{% if alertmanager_wechat_secret | length %}
+  wechat_api_secret: {{ alertmanager_wechat_secret | quote }}
 {% endif %}
-{% if alertmanager_wechat_corp_id != '' %}
-  wechat_api_corp_id: {{ alertmanager_wechat_corp_id }}
+{% if alertmanager_wechat_corp_id | length %}
+  wechat_api_corp_id: {{ alertmanager_wechat_corp_id | quote }}
 {% endif %}
 templates:
 - '/etc/alertmanager/templates/*.tmpl'
-{% if alertmanager_receivers != [] %}
+{% if alertmanager_receivers | length %}
 receivers:
 {{ alertmanager_receivers | to_nice_yaml(indent=2) }}
 {% endif %}
-{% if alertmanager_inhibit_rules != [] %}
+{% if alertmanager_inhibit_rules | length %}
 inhibit_rules:
 {{ alertmanager_inhibit_rules | to_nice_yaml(indent=2) }}
 {% endif %}
 route:
   {{ alertmanager_route | to_nice_yaml(indent=2) | indent(2, False) }}
-{% if alertmanager_child_routes != [] %}
+{% if alertmanager_child_routes | length %}
   routes:
   {{ alertmanager_child_routes | to_nice_yaml(indent=2) | indent(2, False) }}
 {% endif %}