diff --git a/Cargo.toml b/Cargo.toml
index d8ba6280..bf013e23 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -7,7 +7,7 @@ description = "MathCAT: Math Capable Assistive Technology ('Speech and braille f
 repository = "https://github.com/NSoiffer/MathCAT"
 homepage = "https://nsoiffer.github.io/MathCAT/"
 documentation = "https://nsoiffer.github.io/MathCAT/"
-edition = "2018"
+edition = "2024"
 exclude = ["src/main.rs", "docs", "PythonScripts"]    # should have "Rules/", but then one can't run build.rs to build the zip file
 
 
diff --git a/src/canonicalize.rs b/src/canonicalize.rs
index 52cd0b6b..7dadd054 100644
--- a/src/canonicalize.rs
+++ b/src/canonicalize.rs
@@ -382,7 +382,7 @@ pub fn replace_children<'a>(mathml: Element<'a>, replacements: Vec<Element<'a>>)
 pub fn get_presentation_element(element: Element) -> (usize, Element) {
 	assert_eq!(name(element), "semantics");
 	let children = element.children();
-	if let Some( (i, child) ) = children.iter().enumerate().find(|(_, &child)| 
+	if let Some( (i, child) ) = children.iter().enumerate().find(|&(_, &child)|
 			if let Some(encoding) = as_element(child).attribute_value("encoding") {
 				encoding == "MathML-Presentation"
 			} else {
@@ -1502,7 +1502,7 @@ impl CanonicalizeContext {
 			let n = children.len();
 			let i_mprescripts =
 				if let Some((i,_)) = children.iter().enumerate()
-					.find(|(_,&el)| name(as_element(el)) == "mprescripts") { i } else { n };
+					.find(|&(_,&el)| name(as_element(el)) == "mprescripts") { i } else { n };
 			let has_misplaced_mprescripts = i_mprescripts & 1 == 0;  // should be first, third, ... child
 			let mut has_proper_number_of_children = if i_mprescripts == n { n & 1 == 0} else { n & 1 != 0 }; // should be odd else even #
 			if has_misplaced_mprescripts || !has_proper_number_of_children || has_none_none_script_pair(&children) {
diff --git a/src/speech.rs b/src/speech.rs
index be0b40cf..5a85ebe4 100644
--- a/src/speech.rs
+++ b/src/speech.rs
@@ -1895,14 +1895,14 @@ impl UnicodeDef {
 
         fn substitute_ch(yaml: &Yaml, ch: &str) -> Yaml {
             return match yaml {
-                Yaml::Array(ref v) => {
+                Yaml::Array(v) => {
                     Yaml::Array(
                         v.iter()
                          .map(|e| substitute_ch(e, ch))
                          .collect::<Vec<Yaml>>()
                     )
                 },
-                Yaml::Hash(ref h) => {
+                Yaml::Hash(h) => {
                     Yaml::Hash(
                         h.iter()
                          .map(|(key,val)| (key.clone(), substitute_ch(val, ch)) )