diff --git a/.github/workflows/ci-tests.yml b/.github/workflows/ci-tests.yml
index 4a8cef7..2a7ff86 100644
--- a/.github/workflows/ci-tests.yml
+++ b/.github/workflows/ci-tests.yml
@@ -31,36 +31,36 @@ jobs:
             java: 17
             spark: "3.4"
             r-version: release
-          - os-name: ubuntu
-            os-version: latest
-            java: 8
-            spark: "2.4"
-            r-version: devel
-          - os-name: ubuntu
-            os-version: "22.04"
-            java: 11
-            spark: "3.0"
-            r-version: oldrel
-          - os-name: macos
-            os-version: latest
-            java: 8
-            spark: "3.2"
-            r-version: release
-          - os-name: macos
-            os-version: latest
-            java: 17
-            spark: "3.4"
-            r-version: devel
-          - os-name: windows
-            os-version: latest
-            java: 8
-            spark: "3.1"
-            r-version: oldrel
-          - os-name: windows
-            os-version: "2022"
-            java: 17
-            spark: "3.3"
-            r-version: release
+          # - os-name: ubuntu
+          #   os-version: latest
+          #   java: 8
+          #   spark: "2.4"
+          #   r-version: devel
+          # - os-name: ubuntu
+          #   os-version: "22.04"
+          #   java: 11
+          #   spark: "3.0"
+          #   r-version: oldrel
+          # - os-name: macos
+          #   os-version: latest
+          #   java: 8
+          #   spark: "3.2"
+          #   r-version: release
+          # - os-name: macos
+          #   os-version: latest
+          #   java: 17
+          #   spark: "3.4"
+          #   r-version: devel
+          # - os-name: windows
+          #   os-version: latest
+          #   java: 8
+          #   spark: "3.1"
+          #   r-version: oldrel
+          # - os-name: windows
+          #   os-version: "2022"
+          #   java: 17
+          #   spark: "3.3"
+          #   r-version: release
     env:
       SPARK_VERSION: ${{ matrix.config.spark }}
       BIGQUERY_PROJECT_ID: mirai-sbb
@@ -145,10 +145,10 @@ jobs:
         
       - name: Set Google application default credentials
         env:
-          ADC: ${{ secrets.GCLOUD_APPLICATION_CREDENTIALS }}
+          ADC: "${{ secrets.GCLOUD_APPLICATION_CREDENTIALS }}"
         shell: bash
         run: |
-          echo $ADC > $BIGQUERY_APPLICATION_CREDENTIALS
+          echo "$ADC" > $BIGQUERY_APPLICATION_CREDENTIALS
       
       - name: Run R CMD check
         uses: r-lib/actions/check-r-package@v2
diff --git a/tests/testthat/setup.R b/tests/testthat/setup.R
index ec8cf0b..e60357a 100644
--- a/tests/testthat/setup.R
+++ b/tests/testthat/setup.R
@@ -5,6 +5,4 @@ bigquery_defaults(
   serviceAccountKeyFile = Sys.getenv("BIGQUERY_APPLICATION_CREDENTIALS")
 )
 
-print(.Options)
-
 options(spark.version = Sys.getenv("SPARK_VERSION", "3.5"))