diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 5eb34202..b177da0f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -15,6 +15,9 @@ env:
   pull_request:
     branches-ignore:
     - gh-pages
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref == format('refs/heads/{0}', github.event.repository.default_branch) && github.run_id || github.ref }}
+  cancel-in-progress: true
 jobs:
   build:
     name: Build
diff --git a/zio-sbt-githubactions/src/main/scala/zio/sbt/githubactions/model.scala b/zio-sbt-githubactions/src/main/scala/zio/sbt/githubactions/model.scala
index 8f2da7dd..a3a6d142 100644
--- a/zio-sbt-githubactions/src/main/scala/zio/sbt/githubactions/model.scala
+++ b/zio-sbt-githubactions/src/main/scala/zio/sbt/githubactions/model.scala
@@ -316,6 +316,12 @@ object Workflow {
                          .map(_.toKeyValuePair): _*
                      )
                    }),
+          "concurrency" := Json.obj(
+            "group" := Json.fromString(
+              "${{ github.workflow }}-${{ github.ref == format('refs/heads/{0}', github.event.repository.default_branch) && github.run_id || github.ref }}"
+            ),
+            "cancel-in-progress" := true
+          ),
           "jobs" := Json.obj(wf.jobs.map(job => job.id := job): _*)
         )
 }