diff --git a/.circleci/config.yml b/.circleci/config.yml
index bd05577cd7cf..ec9d9de9d995 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -136,24 +136,24 @@ jobs:
     steps:
       *rubocop_steps
 
-  # Latest MRI release candidate
-  ruby-rc-spec:
+  # ruby-head (nightly snapshot build)
+  ruby-head-spec:
     docker:
-      - image: circleci/ruby:rc
+      - image: rubocophq/circleci-ruby-snapshot:latest
     environment:
       <<: *common_env
     steps:
       *spec_steps
-  ruby-rc-ascii_spec:
+  ruby-head-ascii_spec:
     docker:
-      - image: circleci/ruby:rc
+      - image: rubocophq/circleci-ruby-snapshot:latest
     environment:
       <<: *common_env
     steps:
       *ascii_spec_steps
-  ruby-rc-rubocop:
+  ruby-head-rubocop:
     docker:
-      - image: circleci/ruby:rc
+      - image: rubocophq/circleci-ruby-snapshot:latest
     environment:
       <<: *common_env
     steps:
@@ -262,11 +262,11 @@ workflows:
             - cc-setup
       - ruby-2.5-ascii_spec
       - ruby-2.5-rubocop
-      - ruby-rc-spec:
+      - ruby-head-spec:
           requires:
             - cc-setup
-      - ruby-rc-ascii_spec
-      - ruby-rc-rubocop
+      - ruby-head-ascii_spec
+      - ruby-head-rubocop
       - jruby-9.2-spec:
           requires:
             - cc-setup