diff --git a/Cargo.lock b/Cargo.lock
index ea59887b..7d45fac9 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1267,9 +1267,9 @@ dependencies = [
 
 [[package]]
 name = "pulldown-cmark"
-version = "0.8.0"
+version = "0.9.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ffade02495f22453cd593159ea2f59827aae7f53fa8323f756799b670881dcf8"
+checksum = "acd16514d1af5f7a71f909a44ef253cdb712a376d7ebc8ae4a471a9be9743548"
 dependencies = [
  "bitflags",
  "getopts",
diff --git a/Cargo.toml b/Cargo.toml
index fc5e1b16..0d7751cd 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -25,7 +25,7 @@ lazy_static = "1.0"
 log = "0.4"
 memchr = "2.0"
 opener = "0.5"
-pulldown-cmark = "0.8.0"
+pulldown-cmark = "0.9.0"
 regex = "1.0.0"
 serde = "1.0"
 serde_derive = "1.0"
diff --git a/src/book/summary.rs b/src/book/summary.rs
index 981e1079..1ade05ec 100644
--- a/src/book/summary.rs
+++ b/src/book/summary.rs
@@ -1,6 +1,6 @@
 use crate::errors::*;
 use memchr::{self, Memchr};
-use pulldown_cmark::{self, Event, Tag};
+use pulldown_cmark::{self, Event, HeadingLevel, Tag};
 use std::fmt::{self, Display, Formatter};
 use std::iter::FromIterator;
 use std::ops::{Deref, DerefMut};
@@ -161,7 +161,7 @@ impl From<Link> for SummaryItem {
 /// > match the following regex: "[^<>\n[]]+".
 struct SummaryParser<'a> {
     src: &'a str,
-    stream: pulldown_cmark::OffsetIter<'a>,
+    stream: pulldown_cmark::OffsetIter<'a, 'a>,
     offset: usize,
 
     /// We can't actually put an event back into the `OffsetIter` stream, so instead we store it
@@ -263,7 +263,7 @@ impl<'a> SummaryParser<'a> {
         loop {
             match self.next_event() {
                 Some(ev @ Event::Start(Tag::List(..)))
-                | Some(ev @ Event::Start(Tag::Heading(1))) => {
+                | Some(ev @ Event::Start(Tag::Heading(HeadingLevel::H1, ..))) => {
                     if is_prefix {
                         // we've finished prefix chapters and are at the start
                         // of the numbered section.
@@ -302,10 +302,10 @@ impl<'a> SummaryParser<'a> {
                     break;
                 }
 
-                Some(Event::Start(Tag::Heading(1))) => {
+                Some(Event::Start(Tag::Heading(HeadingLevel::H1, ..))) => {
                     debug!("Found a h1 in the SUMMARY");
 
-                    let tags = collect_events!(self.stream, end Tag::Heading(1));
+                    let tags = collect_events!(self.stream, end Tag::Heading(HeadingLevel::H1, ..));
                     Some(stringify_events(tags))
                 }
 
@@ -375,7 +375,7 @@ impl<'a> SummaryParser<'a> {
                 }
                 // The expectation is that pulldown cmark will terminate a paragraph before a new
                 // heading, so we can always count on this to return without skipping headings.
-                Some(ev @ Event::Start(Tag::Heading(1))) => {
+                Some(ev @ Event::Start(Tag::Heading(HeadingLevel::H1, ..))) => {
                     // we're starting a new part
                     self.back(ev);
                     break;
@@ -527,10 +527,10 @@ impl<'a> SummaryParser<'a> {
     fn parse_title(&mut self) -> Option<String> {
         loop {
             match self.next_event() {
-                Some(Event::Start(Tag::Heading(1))) => {
+                Some(Event::Start(Tag::Heading(HeadingLevel::H1, ..))) => {
                     debug!("Found a h1 in the SUMMARY");
 
-                    let tags = collect_events!(self.stream, end Tag::Heading(1));
+                    let tags = collect_events!(self.stream, end Tag::Heading(HeadingLevel::H1, ..));
                     return Some(stringify_events(tags));
                 }
                 // Skip a HTML element such as a comment line.
diff --git a/src/renderer/html_handlebars/search.rs b/src/renderer/html_handlebars/search.rs
index 2dc717fb..39b59800 100644
--- a/src/renderer/html_handlebars/search.rs
+++ b/src/renderer/html_handlebars/search.rs
@@ -99,7 +99,7 @@ fn render_item(
 
     while let Some(event) = p.next() {
         match event {
-            Event::Start(Tag::Heading(i)) if i <= max_section_depth => {
+            Event::Start(Tag::Heading(i, ..)) if i as u32 <= max_section_depth => {
                 if !heading.is_empty() {
                     // Section finished, the next heading is following now
                     // Write the data to the index, and clear it for the next section
@@ -118,7 +118,7 @@ fn render_item(
 
                 in_heading = true;
             }
-            Event::End(Tag::Heading(i)) if i <= max_section_depth => {
+            Event::End(Tag::Heading(i, ..)) if i as u32 <= max_section_depth => {
                 in_heading = false;
                 section_id = Some(utils::id_from_content(&heading));
                 breadcrumbs.push(heading.clone());
diff --git a/src/utils/mod.rs b/src/utils/mod.rs
index 3910e3dd..44494a8b 100644
--- a/src/utils/mod.rs
+++ b/src/utils/mod.rs
@@ -160,7 +160,7 @@ pub fn render_markdown(text: &str, curly_quotes: bool) -> String {
     render_markdown_with_path(text, curly_quotes, None)
 }
 
-pub fn new_cmark_parser(text: &str, curly_quotes: bool) -> Parser<'_> {
+pub fn new_cmark_parser(text: &str, curly_quotes: bool) -> Parser<'_, '_> {
     let mut opts = Options::empty();
     opts.insert(Options::ENABLE_TABLES);
     opts.insert(Options::ENABLE_FOOTNOTES);