diff --git a/.github/workflows/deploy_bookdown.yml b/.github/workflows/deploy_bookdown.yml
index 4a4879b..5da5141 100644
--- a/.github/workflows/deploy_bookdown.yml
+++ b/.github/workflows/deploy_bookdown.yml
@@ -13,7 +13,7 @@ jobs:
       - uses: actions/checkout@v1
       - uses: r-lib/actions/setup-r@v1
         with:
-          r-version: '3.6.3"
+          r-version: '3.6.3'
       - uses: r-lib/actions/setup-pandoc@v1
         with:
           pandoc-version: '2.11'