diff --git a/crates/core/src/document/djvu.rs b/crates/core/src/document/djvu.rs
index 94c18e1..137afe7 100644
--- a/crates/core/src/document/djvu.rs
+++ b/crates/core/src/document/djvu.rs
@@ -266,7 +266,7 @@ impl Document for DjvuDocument {
 }
 
 impl DjvuDocument {
-    pub fn page(&self, index: usize) -> Option<DjvuPage> {
+    pub fn page(&self, index: usize) -> Option<DjvuPage<'_>> {
         unsafe {
             let page = ddjvu_page_create_by_pageno(self.doc, index as libc::c_int);
             if page.is_null() {
diff --git a/crates/core/src/document/djvulibre_sys.rs b/crates/core/src/document/djvulibre_sys.rs
index d7cca2a..efbb00a 100644
--- a/crates/core/src/document/djvulibre_sys.rs
+++ b/crates/core/src/document/djvulibre_sys.rs
@@ -42,7 +42,7 @@ pub type RenderMode = libc::c_uint;
 pub type FormatStyle = libc::c_uint;
 
 #[link(name="djvulibre")]
-extern {
+extern "C" {
     pub fn ddjvu_context_create(name: *const libc::c_char) -> *mut ExoContext;
     pub fn ddjvu_context_release(ctx: *mut ExoContext);
     pub fn ddjvu_cache_set_size(ctx: *mut ExoContext, size: libc::c_ulong);
diff --git a/crates/core/src/document/html/css.rs b/crates/core/src/document/html/css.rs
index fe92878..142d5bf 100644
--- a/crates/core/src/document/html/css.rs
+++ b/crates/core/src/document/html/css.rs
@@ -120,7 +120,7 @@ pub struct CssParser<'a> {
 }
 
 impl<'a> CssParser<'a> {
-    pub fn new(input: &str) -> CssParser {
+    pub fn new(input: &str) -> CssParser<'_> {
         CssParser {
             input,
             offset: 0,
diff --git a/crates/core/src/document/html/dom.rs b/crates/core/src/document/html/dom.rs
index 191e958..2f677c5 100644
--- a/crates/core/src/document/html/dom.rs
+++ b/crates/core/src/document/html/dom.rs
@@ -151,19 +151,19 @@ impl XmlTree {
         unsafe { self.nodes.get_unchecked_mut(id.to_index()) }
     }
 
-    pub fn get(&self, id: NodeId) -> NodeRef {
+    pub fn get(&self, id: NodeId) -> NodeRef<'_> {
         NodeRef { id, node: self.node(id), tree: self }
     }
 
-    pub fn get_mut(&mut self, id: NodeId) -> NodeMut {
+    pub fn get_mut(&mut self, id: NodeId) -> NodeMut<'_> {
         NodeMut { id, tree: self }
     }
 
-    pub fn root(&self) -> NodeRef {
+    pub fn root(&self) -> NodeRef<'_> {
         self.get(NodeId::from_index(0))
     }
 
-    pub fn root_mut(&mut self) -> NodeMut {
+    pub fn root_mut(&mut self) -> NodeMut<'_> {
         self.get_mut(NodeId::from_index(0))
     }
 
diff --git a/crates/core/src/document/html/xml.rs b/crates/core/src/document/html/xml.rs
index a93e01c..a4164ba 100644
--- a/crates/core/src/document/html/xml.rs
+++ b/crates/core/src/document/html/xml.rs
@@ -9,7 +9,7 @@ pub struct XmlParser<'a> {
 }
 
 impl<'a> XmlParser<'a> {
-    pub fn new(input: &str) -> XmlParser {
+    pub fn new(input: &str) -> XmlParser<'_> {
         XmlParser {
             input,
             offset: 0,
diff --git a/crates/core/src/document/mupdf_sys.rs b/crates/core/src/document/mupdf_sys.rs
index a22e121..2f29640 100644
--- a/crates/core/src/document/mupdf_sys.rs
+++ b/crates/core/src/document/mupdf_sys.rs
@@ -62,7 +62,7 @@ pub enum FzImage {}
 #[link(name="mupdf")]
 #[link(name="mupdf_wrapper", kind="static")]
 
-extern {
+extern "C" {
     pub fn fz_new_context_imp(alloc_ctx: *const FzAllocContext, locks_ctx: *const FzLocksContext, cache_size: libc::size_t, version: *const libc::c_char) -> *mut FzContext;
     pub fn fz_drop_context(ctx: *mut FzContext);
     pub fn fz_register_document_handlers(ctx: *mut FzContext);
diff --git a/crates/core/src/document/pdf.rs b/crates/core/src/document/pdf.rs
index 6a68d90..c688874 100644
--- a/crates/core/src/document/pdf.rs
+++ b/crates/core/src/document/pdf.rs
@@ -106,7 +106,7 @@ unsafe impl Send for PdfDocument {}
 unsafe impl Sync for PdfDocument {}
 
 impl PdfDocument {
-    pub fn page(&self, index: usize) -> Option<PdfPage> {
+    pub fn page(&self, index: usize) -> Option<PdfPage<'_>> {
         unsafe {
             let page = mp_load_page(self.ctx.0, self.doc, index as libc::c_int);
             if page.is_null() {
diff --git a/crates/core/src/font/freetype_sys.rs b/crates/core/src/font/freetype_sys.rs
index b1e3f25..8a92a96 100644
--- a/crates/core/src/font/freetype_sys.rs
+++ b/crates/core/src/font/freetype_sys.rs
@@ -23,7 +23,7 @@ pub type FtPos = libc::c_long;
 pub type FtFixed = libc::c_long;
 pub type FtGlyphFormat = libc::c_uint;
 pub type GlyphBBoxMode = libc::c_uint;
-pub type FtGenericFinalizer = extern fn(*mut libc::c_void);
+pub type FtGenericFinalizer = extern "C" fn(*mut libc::c_void);
 
 pub enum FtLibrary {}
 pub enum FtCharMap {}
@@ -36,7 +36,7 @@ pub enum FtMemory {}
 pub enum FtStream {}
 
 #[link(name="freetype")]
-extern {
+extern "C" {
     pub fn FT_Init_FreeType(lib: *mut *mut FtLibrary) -> FtError;
     pub fn FT_Done_FreeType(lib: *mut FtLibrary) -> FtError;
     pub fn FT_New_Face(lib: *mut FtLibrary, path: *const libc::c_char, idx: libc::c_long, face: *mut *mut FtFace) -> FtError;
diff --git a/crates/core/src/font/harfbuzz_sys.rs b/crates/core/src/font/harfbuzz_sys.rs
index 52ed1e0..dda3e32 100644
--- a/crates/core/src/font/harfbuzz_sys.rs
+++ b/crates/core/src/font/harfbuzz_sys.rs
@@ -20,7 +20,7 @@ pub enum HbBuffer {}
 pub enum HbFont {}
 
 #[link(name="harfbuzz")]
-extern {
+extern "C" {
     pub fn hb_ft_font_create(face: *mut FtFace, destroy: *const libc::c_void) -> *mut HbFont;
     pub fn hb_ft_font_changed(font: *mut HbFont);
     pub fn hb_font_destroy(font: *mut HbFont);
diff --git a/crates/core/src/font/mod.rs b/crates/core/src/font/mod.rs
index b2f3633..211795f 100644
--- a/crates/core/src/font/mod.rs
+++ b/crates/core/src/font/mod.rs
@@ -100,7 +100,7 @@ pub const MD_SIZE: Style = Style {
 
 #[cfg(any(not(target_os = "linux"), target_arch = "arm"))]
 #[link(name="mupdf")]
-extern {
+extern "C" {
     // Based on the outputs of:
     // arm-linux-gnueabihf-readelf -Ws ./libs/libmupdf.so | grep '\b_binary_' | \
     // grep -v '_size$' | awk '{print $8, strtonum($3)-1}' | sort -u
@@ -267,7 +267,7 @@ extern {
 
 #[cfg(all(target_os = "linux", not(target_arch = "arm")))]
 #[link(name="mupdf")]
-extern {
+extern "C" {
     pub static _binary_resources_fonts_droid_DroidSansFallback_ttf_start: [libc::c_uchar; 3556308];
     pub static _binary_resources_fonts_noto_NotoEmoji_Regular_ttf_start: [libc::c_uchar; 418804];
     pub static _binary_resources_fonts_noto_NotoMusic_Regular_otf_start: [libc::c_uchar; 60812];
diff --git a/crates/core/src/helpers.rs b/crates/core/src/helpers.rs
index 6fffe58..7feb927 100644
--- a/crates/core/src/helpers.rs
+++ b/crates/core/src/helpers.rs
@@ -26,7 +26,7 @@ lazy_static! {
     };
 }
 
-pub fn decode_entities(text: &str) -> Cow<str> {
+pub fn decode_entities(text: &str) -> Cow<'_, str> {
     if text.find('&').is_none() {
         return Cow::Borrowed(text);
     }