diff --git a/.circleci/config.yml b/.circleci/config.yml
index c1730df..4832248 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -60,22 +60,23 @@ workflows:
   version: 2
   build-unity:
     jobs:
+      # does not exists yet.
+      # - build-and-test:
+      #     unity_version: 2019.3.0a2
+      #     unity_license: ${UNITY_LICENSE_2019_3}
+      # - build-and-test:
+      #     unity_version: 2019.2.0b2
+      #     unity_license: ${UNITY_LICENSE_2019_2}
       - build-and-create-package:
-          unity_version: 2019.3.0a2
-          unity_license: ${UNITY_LICENSE_2019_3}
+          unity_version: 2019.1.2f1
+          unity_license: ${UNITY_LICENSE_2019_1}
       - build-and-test:
-          unity_version: 2019.3.0a2
-          unity_license: ${UNITY_LICENSE_2019_3}
-      - build-and-test:
-          unity_version: 2019.2.0b2
-          unity_license: ${UNITY_LICENSE_2019_2}
-      - build-and-test:
-          unity_version: 2019.1.3f1
+          unity_version: 2019.1.2f1
           unity_license: ${UNITY_LICENSE_2019_1}
       - build-and-test:
           unity_version: 2018.4.0f1
           unity_license: ${UNITY_LICENSE_2018_4}
       # UniTask minimum support version is 2018.3(C# 7.x)
       - build-and-test:
-          unity_version: 2018.3.14f1
+          unity_version: 2018.3.12f1
           unity_license: ${UNITY_LICENSE_2018_3}
\ No newline at end of file