diff --git a/Cargo.toml b/Cargo.toml
index e87f0b9..8df72fb 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -1,7 +1,7 @@
 [package]
 name = "yamd"
 description = "Yet Another Markdown Document (flavour)"
-version = "0.14.0"
+version = "0.14.1"
 edition = "2021"
 license = "MIT OR Apache-2.0"
 repository = "https://github.com/Lurk/yamd"
@@ -9,9 +9,9 @@ readme = "README.md"
 keywords = ["markdown", "parser"]
 
 [dependencies]
-serde = { version = "1.0.197", features = ["derive"] }
+serde = { version = "1.0.215", features = ["derive"] }
 
 [dev-dependencies]
-pretty_assertions = "1.4.0"
+pretty_assertions = "1.4.1"
 
 
diff --git a/fuzz/.gitignore b/fuzz/.gitignore
new file mode 100644
index 0000000..1a45eee
--- /dev/null
+++ b/fuzz/.gitignore
@@ -0,0 +1,4 @@
+target
+corpus
+artifacts
+coverage
diff --git a/fuzz/Cargo.toml b/fuzz/Cargo.toml
new file mode 100644
index 0000000..64a7a80
--- /dev/null
+++ b/fuzz/Cargo.toml
@@ -0,0 +1,21 @@
+[package]
+name = "yamd-fuzz"
+version = "0.0.0"
+publish = false
+edition = "2021"
+
+[package.metadata]
+cargo-fuzz = true
+
+[dependencies]
+libfuzzer-sys = "0.4"
+
+[dependencies.yamd]
+path = ".."
+
+[[bin]]
+name = "deserialize"
+path = "fuzz_targets/deserialize.rs"
+test = false
+doc = false
+bench = false
diff --git a/fuzz/fuzz_targets/deserialize.rs b/fuzz/fuzz_targets/deserialize.rs
new file mode 100644
index 0000000..b68f78d
--- /dev/null
+++ b/fuzz/fuzz_targets/deserialize.rs
@@ -0,0 +1,9 @@
+#![no_main]
+
+use libfuzzer_sys::fuzz_target;
+
+fuzz_target!(|data: &[u8]| {
+    if let Ok(s) = std::str::from_utf8(data) {
+        let _ = yamd::deserialize(s);
+    }
+});
diff --git a/src/parser/anchor.rs b/src/parser/anchor.rs
index a926843..9f724d2 100644
--- a/src/parser/anchor.rs
+++ b/src/parser/anchor.rs
@@ -23,7 +23,9 @@ pub(crate) fn anchor(p: &mut Parser<'_>) -> Option<Anchor> {
                 p.next_token();
                 paren_count += 1;
             }
-            TokenKind::RightParenthesis if right_square_bracket_pos.is_some() => {
+            TokenKind::RightParenthesis
+                if right_square_bracket_pos.is_some() && paren_count > 0 =>
+            {
                 last_right_paren_pos.replace(pos);
                 p.next_token();
                 paren_count -= 1;
@@ -133,4 +135,14 @@ mod tests {
             Some((&Token::new(TokenKind::Literal, "[", Position::default()), 0))
         )
     }
+
+    #[test]
+    fn right_paren() {
+        let mut p = Parser::new("[a])");
+        assert_eq!(anchor(&mut p), None);
+        assert_eq!(
+            p.peek(),
+            Some((&Token::new(TokenKind::Literal, "[", Position::default()), 0))
+        )
+    }
 }
diff --git a/src/parser/metadata.rs b/src/parser/metadata.rs
index dd8d6ad..b4a5ede 100644
--- a/src/parser/metadata.rs
+++ b/src/parser/metadata.rs
@@ -13,7 +13,11 @@ pub(crate) fn metadata(p: &mut Parser) -> Option<String> {
                 match t.kind {
                     TokenKind::Minus if t.slice.len() == 3 && t.position.column == 0 => {
                         p.next_token();
-                        return Some(p.range_to_string(start + 2..pos - 1));
+                        if (start + 2) > (pos - 1) {
+                            return Some(String::from(""));
+                        } else {
+                            return Some(p.range_to_string(start + 2..pos - 1));
+                        }
                     }
                     _ => {
                         p.next_token();
@@ -85,4 +89,10 @@ mod tests {
             ))
         )
     }
+
+    #[test]
+    fn no_content() {
+        let mut p = Parser::new("---\n---");
+        assert_eq!(metadata(&mut p), Some(String::from("")));
+    }
 }
diff --git a/src/parser/mod.rs b/src/parser/mod.rs
index 5ca2e46..e0265b7 100644
--- a/src/parser/mod.rs
+++ b/src/parser/mod.rs
@@ -55,8 +55,9 @@ impl<'input> Parser<'input> {
 
     pub fn next_token(&mut self) -> Option<&Token<'input>> {
         if self.stack.len() > self.stack_pos {
+            let res = self.stack.get(self.stack_pos);
             self.stack_pos += 1;
-            return self.stack.get(self.stack_pos);
+            return res;
         };
 
         self.stack.push(self.lexer.next()?);
@@ -210,4 +211,15 @@ mod tests {
             Some((&Token::new(TokenKind::Literal, "!", Position::default()), 0))
         )
     }
+
+    #[test]
+    fn backtrack() {
+        let mut p = Parser::new("!");
+        p.next_token();
+        p.backtrack(0);
+        assert_eq!(
+            p.next_token(),
+            Some(&Token::new(TokenKind::Bang, "!", Position::default()))
+        );
+    }
 }