diff --git a/config.toml b/config.toml
index d13da11..6f6b5d2 100644
--- a/config.toml
+++ b/config.toml
@@ -8,8 +8,7 @@ generate_feeds = true
 feed_filenames = ["rss.xml"]
 
 [markdown]
-highlight_code = true
-highlight_theme = "css"
+highlighting = { theme = "GitHub-Dark" }
 
 [extra]
 author = "Yan Lin"
diff --git a/flake.lock b/flake.lock
new file mode 100644
index 0000000..6f6bfa6
--- /dev/null
+++ b/flake.lock
@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1769461804,
+        "narHash": "sha256-msG8SU5WsBUfVVa/9RPLaymvi5bI8edTavbIq3vRlhI=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "bfc1b8a4574108ceef22f02bafcf6611380c100d",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}