diff --git a/.github/actions/upload-to-s3/action.yml b/.github/actions/upload-to-s3/action.yml
index 869c287..644ca34 100644
--- a/.github/actions/upload-to-s3/action.yml
+++ b/.github/actions/upload-to-s3/action.yml
@@ -36,13 +36,16 @@ runs:
         aws-access-key-id: ${{ inputs.aws_access_key_id }}
         aws-secret-access-key: ${{ inputs.aws_secret_access_key }}
         aws-region: ${{ inputs.aws_region }}
+        aws-session-token: ''
         mask-aws-account-id: true
 
+    - name: Set endpoint URL
+      if: inputs.endpoint_url != ''
+      shell: bash
+      run: |
+        aws configure set endpoint_url ${{ inputs.endpoint_url }}
+
     - name: Deploy to S3
       shell: bash
       run: |
-        endpoint_option=""
-        if [ -n "${{ inputs.endpoint_url }}" ]; then
-          endpoint_option="--endpoint-url ${{ inputs.endpoint_url }}"
-        fi
-        s3cmd sync ${{ inputs.path_to_upload }} s3://${{ inputs.s3_bucket }}/${{ inputs.target_path }} --delete $endpoint_option
+        s3cmd sync ${{ inputs.path_to_upload }} s3://${{ inputs.s3_bucket }}/${{ inputs.target_path }} --delete