diff --git a/.circleci/config.yml b/.circleci/config.yml
index 185e68a6..5157a76e 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -69,29 +69,17 @@ workflows:
           rails_version: 6.0.4.7
       - build:
           name: "ruby2-7_rails6-0"
-          ruby_version: 2.7.5
-          rails_version: 6.0.4.7
-      - build:
-          name: "ruby2-6_rails6-0"
-          ruby_version: 2.6.9
+          ruby_version: 2.7.7
           rails_version: 6.0.4.7
 
       - build:
           name: "ruby2-7_rails5-2"
-          ruby_version: 2.7.5
-          rails_version: 5.2.7
-      - build:
-          name: "ruby2-6_rails5-2"
-          ruby_version: 2.6.9
+          ruby_version: 2.7.7
           rails_version: 5.2.7
 
       - build:
           name: "ruby2-7_rails5-1"
-          ruby_version: 2.7.5
-          rails_version: 5.1.7
-      - build:
-          name: "ruby2-6_rails5-1"
-          ruby_version: 2.6.9
+          ruby_version: 2.7.7
           rails_version: 5.1.7
 
   nightly:
@@ -127,28 +115,16 @@ workflows:
           rails_version: 6.0.4.7
       - build:
           name: "ruby2-7_rails6-0"
-          ruby_version: 2.7.5
-          rails_version: 6.0.4.7
-      - build:
-          name: "ruby2-6_rails6-0"
-          ruby_version: 2.6.9
+          ruby_version: 2.7.7
           rails_version: 6.0.4.7
 
       - build:
           name: "ruby2-7_rails5-2"
-          ruby_version: 2.7.5
-          rails_version: 5.2.7
-      - build:
-          name: "ruby2-6_rails5-2"
-          ruby_version: 2.6.9
+          ruby_version: 2.7.7
           rails_version: 5.2.7
 
       - build:
           name: "ruby2-7_rails5-1"
-          ruby_version: 2.7.5
-          rails_version: 5.1.7
-      - build:
-          name: "ruby2-6_rails5-1"
-          ruby_version: 2.6.9
+          ruby_version: 2.7.7
           rails_version: 5.1.7