diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 79a1d6f..8e24fcf 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -1,13 +1,14 @@
 name: CI
 
 # details & description at http://3bb.cc/blog/2020/09/11/github-ci/
+# and/or https://github.com/roswell/roswell/wiki/GitHub-Actions
 
 # Controls when the action will run. Triggers the workflow on push for any branch, and
 # pull requests to master
 on:
   push:
   pull_request:
-    branches: [ endless ]
+    branches: [ endless, core ]
 
 # A workflow run is made up of one or more jobs that can run sequentially or in parallel
 jobs:
@@ -17,7 +18,7 @@ jobs:
       matrix:
       # current ccl-bin has a flaky zip file, so roswell can't install it.
       # Specify a version that works for now.
-        lisp: [ sbcl-bin ]
+        lisp: [ sbcl-bin, ccl-bin, ecl ]
         os: [ windows-latest, ubuntu-latest, macos-latest ]
 
     # run the job on every combination of "lisp" and "os" above