diff --git a/README.md b/README.md
index 9380e02..dfe83c0 100644
--- a/README.md
+++ b/README.md
@@ -13,6 +13,7 @@ This is the code for [Apache Airflow Tutorials](https://www.youtube.com/playlist
 | 4    | [Writing your first pipeline](https://youtu.be/43wHwwZhJMo) ([blog post](https://www.applydatascience.com/airflow/writing-your-first-pipeline/)) | N/A |
 | 5    | [Airflow concept](https://youtu.be/4rQSa2zEWfw) ([blog post](https://www.applydatascience.com/airflow/airflow-concept/)) | N/A |
 | 6    | [Build a data pipeline using Google Cloud Bigquery](https://youtu.be/wAyu5BN3VpY) ([blog post](https://www.applydatascience.com/airflow/bigquery-pipeline-airflow/)) | [v0.6](https://github.com/tuanavu/airflow-tutorial/tree/v0.6) |
+| 7    | [Airflow variables](https://youtu.be/bHQ7nzn0j6k) ([blog post](https://www.applydatascience.com/airflow/airflow-variables/)) | [v0.7](https://github.com/tuanavu/airflow-tutorial/tree/v0.7) |
 
 
 ## Getting Started
diff --git a/docker-compose-gcloud.yml b/docker-compose-gcloud.yml
index 142c802..33c703a 100644
--- a/docker-compose-gcloud.yml
+++ b/docker-compose-gcloud.yml
@@ -15,7 +15,8 @@ services:
       context: https://github.com/puckel/docker-airflow.git#1.10.1
       dockerfile: Dockerfile
       args:
-        AIRFLOW_DEPS: gcp_api,s3        
+        AIRFLOW_DEPS: gcp_api,s3
+        PYTHON_DEPS: sqlalchemy==1.2.0        
     restart: always
     depends_on:
       - postgres
diff --git a/docker-compose.yml b/docker-compose.yml
index 86930c3..3457c62 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -15,7 +15,8 @@ services:
       context: https://github.com/puckel/docker-airflow.git#1.10.1
       dockerfile: Dockerfile
       args:
-        AIRFLOW_DEPS: gcp_api,s3        
+        AIRFLOW_DEPS: gcp_api,s3
+        PYTHON_DEPS: sqlalchemy==1.2.0
     restart: always
     depends_on:
       - postgres
@@ -34,4 +35,4 @@ services:
       test: ["CMD-SHELL", "[ -f /usr/local/airflow/airflow-webserver.pid ]"]
       interval: 30s
       timeout: 30s
-      retries: 3
\ No newline at end of file
+      retries: 3
diff --git a/examples/intro-example/dags/example_variables.py b/examples/intro-example/dags/example_variables.py
index 091b4fd..b015847 100644
--- a/examples/intro-example/dags/example_variables.py
+++ b/examples/intro-example/dags/example_variables.py
@@ -18,13 +18,13 @@
     default_args=default_args)
 
 
-# Config variables
-# Common
-var1 = "value1"
-var2 = [1, 2, 3]
-var3 = {'k': 'value3'}
+# # Config variables
+# # Common
+# var1 = "value1"
+# var2 = [1, 2, 3]
+# var3 = {'k': 'value3'}
 
-## 3 DB connections called
+# # 3 DB connections called
 # var1 = Variable.get("var1")
 # var2 = Variable.get("var2")
 # var3 = Variable.get("var3")
@@ -35,33 +35,33 @@
 # var2 = dag_config["var2"]
 # var3 = dag_config["var3"]
 
-start = DummyOperator(
-    task_id="start",
-    dag=dag
-)
+# start = DummyOperator(
+#     task_id="start",
+#     dag=dag
+# )
 
-# To test this task, run this command:
-# docker-compose run --rm webserver airflow test example_variables get_dag_config 2019-02-15
-t1 = BashOperator(
-    task_id="get_dag_config",
-    bash_command='echo "{0}"'.format(dag_config),
-    dag=dag,
-)
+# # To test this task, run this command:
+# # docker-compose run --rm webserver airflow test example_variables get_dag_config 2019-02-15
+# t1 = BashOperator(
+#     task_id="get_dag_config",
+#     bash_command='echo "{0}"'.format(dag_config),
+#     dag=dag,
+# )
 
-# You can directly use a variable from a jinja template
-## {{ var.value.<variable_name> }}
+# # You can directly use a variable from a jinja template
+# ## {{ var.value.<variable_name> }}
 
-t2 = BashOperator(
-    task_id="get_variable_value",
-    bash_command='echo {{ var.value.var3 }} ',
-    dag=dag,
-)
+# t2 = BashOperator(
+#     task_id="get_variable_value",
+#     bash_command='echo {{ var.value.var3 }} ',
+#     dag=dag,
+# )
 
-## {{ var.json.<variable_name> }}
-t3 = BashOperator(
-    task_id="get_variable_json",
-    bash_command='echo {{ var.json.example_variables_config.var3 }} ',
-    dag=dag,
-)
+# ## {{ var.json.<variable_name> }}
+# t3 = BashOperator(
+#     task_id="get_variable_json",
+#     bash_command='echo {{ var.json.example_variables_config.var3 }} ',
+#     dag=dag,
+# )
 
-start >> [t1, t2, t3]
\ No newline at end of file
+# start >> [t1, t2, t3]
\ No newline at end of file