diff --git a/.github/workflows/bld.yml b/.github/workflows/bld.yml
index bdd3185..1fcc6f8 100644
--- a/.github/workflows/bld.yml
+++ b/.github/workflows/bld.yml
@@ -2,17 +2,15 @@ name: bld-ci
 
 on: [push, pull_request, workflow_dispatch]
 
-env:
-  KOTLIN_HOME: /usr/share/kotlinc
-
 jobs:
   build-gradle-project:
-    runs-on: ubuntu-latest
-
     strategy:
       matrix:
         java-version: [17, 21, 24]
         kotlin-version: [1.9.25, 2.1.20]
+        os: [ ubuntu-latest, windows-latest, macos-latest ]
+
+    runs-on: ${{ matrix.os }}
 
     steps:
       - name: Checkout source repository