diff --git a/book.json b/book.json
index 31a98d0..01f9c08 100644
--- a/book.json
+++ b/book.json
@@ -1,4 +1,9 @@
 {
-    "plugins": ["theme-api"]
+    "plugins": ["theme-api"],
+    "pluginsConfig": {
+        "theme-api": {
+            "theme": "dark"
+        }
+    }
 }