diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 017a3900..1a524d25 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,7 +14,7 @@ jobs:
     strategy:
       matrix:
         platform: [ubuntu-latest, macos-latest, windows-latest]
-        toolchain: [stable, 1.64.0]
+        toolchain: [stable, 1.76.0]
     runs-on: ${{ matrix.platform }}
     steps:
       - uses: actions/checkout@v3
@@ -60,7 +60,7 @@ jobs:
       - name: Setup mdBook
         uses: peaceiris/actions-mdbook@v1
         with:
-          mdbook-version: '0.4.4'
+          mdbook-version: '0.4.37'
       - name: Setup toolchain
         uses: dtolnay/rust-toolchain@master
         with:
diff --git a/.github/workflows/gh-pages.yml b/.github/workflows/gh-pages.yml
index dafba802..81577e82 100644
--- a/.github/workflows/gh-pages.yml
+++ b/.github/workflows/gh-pages.yml
@@ -14,7 +14,7 @@ jobs:
       - name: Setup mdBook
         uses: peaceiris/actions-mdbook@v1
         with:
-          mdbook-version: '0.4.4'
+          mdbook-version: '0.4.37'
 
       - run: cd docs && mdbook build
 
diff --git a/src/main.rs b/src/main.rs
index b4290974..45f35e51 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -152,10 +152,12 @@ fn show_paths(config: &Config) {
         |e| format!("[Error: {e}]"),
         |(mut path, source)| {
             path.push(""); // Trailing path separator
-            path.to_str().map_or_else(|| {
-                "[Invalid]".to_string()
-            }, |path| format!("{path} ({source})"))
-        });
+            path.to_str().map_or_else(
+                || "[Invalid]".to_string(),
+                |path| format!("{path} ({source})"),
+            )
+        },
+    );
     let config_path = get_config_path().map_or_else(
         |e| format!("[Error: {e}]"),
         |(path, _)| path.display().to_string(),
@@ -167,9 +169,10 @@ fn show_paths(config: &Config) {
         path.push(""); // Trailing path separator
         path.display().to_string()
     };
-    let custom_pages_dir = config.directories.custom_pages_dir.as_ref().map_or_else(||{
-        "[None]".to_string()
-    }, |ref path_with_source| path_with_source.to_string());
+    let custom_pages_dir = config.directories.custom_pages_dir.as_ref().map_or_else(
+        || "[None]".to_string(),
+        |ref path_with_source| path_with_source.to_string(),
+    );
 
     println!("Config dir:       {config_dir}");
     println!("Config path:      {config_path}");