diff --git a/.github/workflows/dep_build_v2.yml b/.github/workflows/dep_build_v2.yml
index 6e602aff..c6858da2 100644
--- a/.github/workflows/dep_build_v2.yml
+++ b/.github/workflows/dep_build_v2.yml
@@ -16,7 +16,7 @@ jobs:
       matrix:
         java_version: ['8', '17', '21', '25']
         # Versions need to align with ones in 'main.yml' workflow
-        kotlin_version: ['2.1.21', '2.2.20']
+        kotlin_version: ['2.1.21', '2.2.21', '2.3.0-RC2']
     env:
       JAVA_OPTS: "-XX:+TieredCompilation -XX:TieredStopAtLevel=1"
     steps:
diff --git a/.github/workflows/dep_build_v3.yml b/.github/workflows/dep_build_v3.yml
index a8c54fa6..a0284082 100644
--- a/.github/workflows/dep_build_v3.yml
+++ b/.github/workflows/dep_build_v3.yml
@@ -14,7 +14,7 @@ jobs:
       matrix:
         java_version: ['17', '21', '25']
         # Versions need to align with ones in 'main.yml' workflow
-        kotlin_version: ['2.1.21', '2.2.20']
+        kotlin_version: ['2.1.21', '2.2.21', '2.3.0-RC2']
     env:
       JAVA_OPTS: "-XX:+TieredCompilation -XX:TieredStopAtLevel=1"
     steps:
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 8feea1b7..dfd24527 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -21,7 +21,7 @@ jobs:
       max-parallel: 5
       matrix:
         java_version: ['17', '21', '25']
-        kotlin_version: ['2.1.21', '2.2.20']
+        kotlin_version: ['2.1.21', '2.2.21', '2.3.0-RC2']
         include:
           - java_version: '17'
             kotlin_version: '2.1.21'