diff --git a/Cargo.lock b/Cargo.lock
index 11e86009d..f5ccbcaa0 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -3559,9 +3559,9 @@ dependencies = [
 
 [[package]]
 name = "syntect"
-version = "4.6.0"
+version = "5.0.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8b20815bbe80ee0be06e6957450a841185fcf690fe0178f14d77a05ce2caa031"
+checksum = "c6c454c27d9d7d9a84c7803aaa3c50cd088d2906fe3c6e42da3209aa623576a8"
 dependencies = [
  "bincode",
  "bitflags",
@@ -3569,12 +3569,13 @@ dependencies = [
  "flate2",
  "fnv",
  "lazy_static",
- "lazycell",
+ "once_cell",
  "plist",
  "regex-syntax",
  "serde",
  "serde_derive",
  "serde_json",
+ "thiserror",
  "walkdir",
  "yaml-rust",
 ]
diff --git a/egui_demo_lib/Cargo.toml b/egui_demo_lib/Cargo.toml
index 0f1901748..7253748b0 100644
--- a/egui_demo_lib/Cargo.toml
+++ b/egui_demo_lib/Cargo.toml
@@ -41,7 +41,7 @@ chrono = { version = "0.4", optional = true, features = ["js-sys", "wasmbind"] }
 ## Enable this when generating docs.
 document-features = { version = "0.2", optional = true }
 serde = { version = "1", optional = true, features = ["derive"] }
-syntect = { version = "4", optional = true, default-features = false, features = ["default-fancy"] }
+syntect = { version = "5", optional = true, default-features = false, features = ["default-fancy"] }
 
 
 [dev-dependencies]
diff --git a/egui_demo_lib/src/syntax_highlighting.rs b/egui_demo_lib/src/syntax_highlighting.rs
index 086b20fa6..62c3625e3 100644
--- a/egui_demo_lib/src/syntax_highlighting.rs
+++ b/egui_demo_lib/src/syntax_highlighting.rs
@@ -350,7 +350,7 @@ impl Highlighter {
         };
 
         for line in LinesWithEndings::from(text) {
-            for (style, range) in h.highlight(line, &self.ps) {
+            for (style, range) in h.highlight_line(line, &self.ps) {
                 let fg = style.foreground;
                 let text_color = egui::Color32::from_rgb(fg.r, fg.g, fg.b);
                 let italics = style.font_style.contains(FontStyle::ITALIC);