diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 5b25bddd7..8646e7489 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,7 +15,7 @@ name: ci
   pull_request:
     branches:
     - master
-  create: 
+  create:
 jobs:
   tests:
     runs-on: ubuntu-latest
@@ -28,6 +28,7 @@ jobs:
         - '2.5'
         - '2.4'
         - jruby
+        - truffleruby
         include:
         - ruby: '2.6'
           coverage: 'true'
diff --git a/.github/workflows/custom/ci.yml b/.github/workflows/custom/ci.yml
index 516374556..9187b1386 100644
--- a/.github/workflows/custom/ci.yml
+++ b/.github/workflows/custom/ci.yml
@@ -18,6 +18,7 @@ jobs:
           - "2.5"
           - "2.4"
           - "jruby"
+          - "truffleruby"
         runtime_deps:
           - "dry-transformer-latest"
           - "dry-transformer-master"