diff --git a/.circleci/config.yml b/.circleci/config.yml
index db25d0339..0b91c1b3f 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -54,7 +54,7 @@ jobs:
       - run:
           name: Deploy to Railway App (You must set RAILWAY_TOKEN env var)
           command: |
-            cd section-07-ci-and-publishing/house-prices-api && railway up --detach
+            cd section-07-ci-and-publishing/house-prices-api && railway up --detach -s splendid-writer -e production
 
   section_07_test_and_upload_regression_model:
     <<: *defaults
@@ -92,7 +92,7 @@ jobs:
       - run:
           name: Build and run Dockerfile (see https://docs.railway.app/deploy/dockerfiles)
           command: |
-            cd section-08-deploying-with-containers && railway up --detach
+            cd section-08-deploying-with-containers && railway up --detach -s splendid-writer -e production
 
   test_regression_model_py37:
     docker:
@@ -279,7 +279,15 @@ workflows:
                 - demo
       # upload after git tags are created
       - section_07_test_and_upload_regression_model:
-          <<: *tags_only
+          # <<: *tags_only
+          requires:
+            - section_07_deploy_app_to_railway
+          filters:
+            branches:
+              only:
+                - main
+                - master
+                - demo
 
       - section_08_deploy_app_container_via_railway:
          filters:
diff --git a/section-07-ci-and-publishing/model-package/regression_model/VERSION b/section-07-ci-and-publishing/model-package/regression_model/VERSION
index c4e41f945..4d54daddb 100644
--- a/section-07-ci-and-publishing/model-package/regression_model/VERSION
+++ b/section-07-ci-and-publishing/model-package/regression_model/VERSION
@@ -1 +1 @@
-4.0.3
+4.0.2
diff --git a/section-07-ci-and-publishing/model-package/regression_model/predict.py b/section-07-ci-and-publishing/model-package/regression_model/predict.py
index d27739780..7a9bc55c5 100644
--- a/section-07-ci-and-publishing/model-package/regression_model/predict.py
+++ b/section-07-ci-and-publishing/model-package/regression_model/predict.py
@@ -25,9 +25,10 @@ def make_prediction(
     if not errors:
         predictions = _price_pipe.predict(
             X=validated_data[config.model_config.features]
-        )
+        )  
+        dtype = np.result_type(np.float32, predictions)
         results = {
-            "predictions": [np.exp(pred) for pred in predictions],  # type: ignore
+            "predictions": [np.exp(pred).astype(dtype) for pred in predictions],  # type: ignore
             "version": _version,
             "errors": errors,
         }
diff --git a/section-07-ci-and-publishing/model-package/tox.ini b/section-07-ci-and-publishing/model-package/tox.ini
index d93e00636..8ae84679e 100644
--- a/section-07-ci-and-publishing/model-package/tox.ini
+++ b/section-07-ci-and-publishing/model-package/tox.ini
@@ -21,6 +21,7 @@ passenv =
 	KAGGLE_USERNAME
 	KAGGLE_KEY
 	GEMFURY_PUSH_URL
+	RAILWAY_TOKEN
 
 [testenv:test_package]
 allowlist_externals = python