diff --git a/quartz.config.ts b/quartz.config.ts
index ba0f6dc..eab705e 100644
--- a/quartz.config.ts
+++ b/quartz.config.ts
@@ -67,7 +67,7 @@ const config: QuartzConfig = {
       }),
       Plugin.ObsidianFlavoredMarkdown({ enableInHtmlEmbed: false }),
       Plugin.GitHubFlavoredMarkdown(),
-      Plugin.TableOfContents(),
+      Plugin.TableOfContents({ collapseByDefault: true }),
       Plugin.CrawlLinks({ markdownLinkResolution: "shortest" }),
       Plugin.Description(),
       Plugin.Latex({ renderEngine: "katex" }),