diff --git a/.github/actions/build-assetbundles/action.yml b/.github/actions/build-assetbundles/action.yml
index c19a801..e4e945e 100644
--- a/.github/actions/build-assetbundles/action.yml
+++ b/.github/actions/build-assetbundles/action.yml
@@ -13,6 +13,9 @@ inputs:
   assetbundle-dir:
     description: Destination for built assetbundles
 
+  unity-license:
+    description: Your Unity License file contents
+
 runs:
   using: composite
   steps:
@@ -30,6 +33,14 @@ runs:
         --volume ${{ github.workspace }}:/github/workspace 
         build-assetbundle 
 
+    - name: Authenticate Unity License
+      shell: bash
+      run: |
+        echo $UNITY_ULF >> 'unity_license.ulf'
+        docker exec build-assetbundle unity-editor -batchmode -manualLicenseFile unity_license.ulf -logfile
+      env:
+        UNITY_ULF: ${{ inputs.unity-license }}
+
     - name: Copy editor tools into project
       shell: bash
       run: |