diff --git a/.circleci/config.yml b/.circleci/config.yml
index 161a990..21dba85 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -39,11 +39,11 @@ jobs:
           command: |
             . venv/bin/activate
             cd integration_tests
-            dbt deps --target postgres
-            dbt seed --target postgres --full-refresh
-            dbt run --target postgres --full-refresh --vars 'update: false'
-            dbt run --target postgres --vars 'update: true'
-            dbt test --target postgres
+            dbt --warn-error deps --target postgres
+            dbt --warn-error seed --target postgres --full-refresh
+            dbt --warn-error run --target postgres --full-refresh --vars 'update: false'
+            dbt --warn-error run --target postgres --vars 'update: true'
+            dbt --warn-error test --target postgres
 
       - run:
           name: "Run Tests - Redshift"
@@ -51,11 +51,11 @@ jobs:
             . venv/bin/activate
             echo `pwd`
             cd integration_tests
-            dbt deps --target redshift
-            dbt seed --target redshift --full-refresh
-            dbt run --target redshift --full-refresh --vars 'update: false'
-            dbt run --target redshift --vars 'update: true'
-            dbt test --target redshift
+            dbt --warn-error deps --target redshift
+            dbt --warn-error seed --target redshift --full-refresh
+            dbt --warn-error run --target redshift --full-refresh --vars 'update: false'
+            dbt --warn-error run --target redshift --vars 'update: true'
+            dbt --warn-error test --target redshift
 
       - run:
           name: "Run Tests - Snowflake"
@@ -63,11 +63,11 @@ jobs:
             . venv/bin/activate
             echo `pwd`
             cd integration_tests
-            dbt deps --target snowflake
-            dbt seed --target snowflake --full-refresh
-            dbt run --target snowflake --full-refresh --vars 'update: false'
-            dbt run --target snowflake --vars 'update: true'
-            dbt test --target snowflake
+            dbt --warn-error deps --target snowflake
+            dbt --warn-error seed --target snowflake --full-refresh
+            dbt --warn-error run --target snowflake --full-refresh --vars 'update: false'
+            dbt --warn-error run --target snowflake --vars 'update: true'
+            dbt --warn-error test --target snowflake
 
       - run:
           name: "Run Tests - BigQuery"
@@ -78,11 +78,11 @@ jobs:
             . venv/bin/activate
             echo `pwd`
             cd integration_tests
-            dbt deps --target bigquery
-            dbt seed --target bigquery --full-refresh
-            dbt run --target bigquery --full-refresh --vars 'update: false'
-            dbt run --target bigquery --vars 'update: true'
-            dbt test --target bigquery
+            dbt --warn-error deps --target bigquery
+            dbt --warn-error seed --target bigquery --full-refresh
+            dbt --warn-error run --target bigquery --full-refresh --vars 'update: false'
+            dbt --warn-error run --target bigquery --vars 'update: true'
+            dbt --warn-error test --target bigquery
 
       - save_cache:
           key: deps1-{{ .Branch }}
diff --git a/integration_tests/ci/sample.profiles.yml b/integration_tests/ci/sample.profiles.yml
index 1bb1c64..15b4da9 100644
--- a/integration_tests/ci/sample.profiles.yml
+++ b/integration_tests/ci/sample.profiles.yml
@@ -14,7 +14,7 @@ integration_tests:
       host: "{{ env_var('POSTGRES_TEST_HOST') }}"
       user: "{{ env_var('POSTGRES_TEST_USER') }}"
       pass: "{{ env_var('POSTGRES_TEST_PASS') }}"
-      port: "{{ env_var('POSTGRES_TEST_PORT') }}"
+      port: "{{ env_var('POSTGRES_TEST_PORT') | as_number }}"
       dbname: "{{ env_var('POSTGRES_TEST_DBNAME') }}"
       schema: snowplow_integration_tests_postgres
       threads: 1
@@ -25,7 +25,7 @@ integration_tests:
       user: "{{ env_var('REDSHIFT_TEST_USER') }}"
       pass: "{{ env_var('REDSHIFT_TEST_PASS') }}"
       dbname: "{{ env_var('REDSHIFT_TEST_DBNAME') }}"
-      port: "{{ env_var('REDSHIFT_TEST_PORT') }}"
+      port: "{{ env_var('REDSHIFT_TEST_PORT') | as_number }}"
       schema: snowplow_integration_tests_redshift
       threads: 1
 
@@ -36,7 +36,7 @@ integration_tests:
       project: "{{ env_var('BIGQUERY_TEST_DATABASE') }}"
       schema: snowplow_integration_tests_bigquery
       threads: 1
-      
+
     snowflake:
       type: snowflake
       account: "{{ env_var('SNOWFLAKE_TEST_ACCOUNT') }}"
diff --git a/packages.yml b/packages.yml
index 4e57658..ecb7073 100644
--- a/packages.yml
+++ b/packages.yml
@@ -1,3 +1,3 @@
 packages:
   - package: fishtown-analytics/dbt_utils
-    version: ">=0.2.5"
+    version: [">=0.4.0", "<0.6.0"]