diff --git a/.changes/change-pr-12270.md b/.changes/change-pr-12270.md
new file mode 100644
index 000000000000..9557656d0667
--- /dev/null
+++ b/.changes/change-pr-12270.md
@@ -0,0 +1,5 @@
+---
+"tauri-build": "patch:bug"
+---
+
+Update `cargo_toml` to `0.21.0`. This adds compatibility with Rust's 2024 Edition.
diff --git a/Cargo.lock b/Cargo.lock
index 105805136d46..286b07141c24 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1561,9 +1561,9 @@ dependencies = [
 
 [[package]]
 name = "cargo_toml"
-version = "0.17.2"
+version = "0.21.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "8a969e13a7589e9e3e4207e153bae624ade2b5622fb4684a4923b23ec3d57719"
+checksum = "5fbd1fe9db3ebf71b89060adaf7b0504c2d6a425cf061313099547e382c2e472"
 dependencies = [
  "serde",
  "toml 0.8.19",
diff --git a/crates/tauri-build/Cargo.toml b/crates/tauri-build/Cargo.toml
index c6a8972b8d62..9738c27b51cc 100644
--- a/crates/tauri-build/Cargo.toml
+++ b/crates/tauri-build/Cargo.toml
@@ -33,7 +33,7 @@ tauri-utils = { version = "2.1.1", path = "../tauri-utils", features = [
   "build",
   "resources",
 ] }
-cargo_toml = "0.17"
+cargo_toml = "0.21"
 serde = "1"
 serde_json = "1"
 heck = "0.5"
diff --git a/crates/tauri-build/src/lib.rs b/crates/tauri-build/src/lib.rs
index a1dd235ea26c..a4033d76bd2f 100644
--- a/crates/tauri-build/src/lib.rs
+++ b/crates/tauri-build/src/lib.rs
@@ -506,19 +506,8 @@ pub fn try_build(attributes: Attributes) -> Result<()> {
 
   cfg_alias("dev", is_dev());
 
-  let ws_path = get_workspace_dir()?;
-  let mut manifest =
-    Manifest::<cargo_toml::Value>::from_slice_with_metadata(&fs::read("Cargo.toml")?)?;
-
-  if let Ok(ws_manifest) = Manifest::from_path(ws_path.join("Cargo.toml")) {
-    Manifest::complete_from_path_and_workspace(
-      &mut manifest,
-      Path::new("Cargo.toml"),
-      Some((&ws_manifest, ws_path.as_path())),
-    )?;
-  } else {
-    Manifest::complete_from_path(&mut manifest, Path::new("Cargo.toml"))?;
-  }
+  let cargo_toml_path = Path::new("Cargo.toml").canonicalize()?;
+  let mut manifest = Manifest::<cargo_toml::Value>::from_path_with_metadata(cargo_toml_path)?;
 
   let out_dir = PathBuf::from(env::var("OUT_DIR").unwrap());
 
@@ -701,23 +690,3 @@ pub fn try_build(attributes: Attributes) -> Result<()> {
 
   Ok(())
 }
-
-#[derive(serde::Deserialize)]
-struct CargoMetadata {
-  workspace_root: PathBuf,
-}
-
-fn get_workspace_dir() -> Result<PathBuf> {
-  let output = std::process::Command::new("cargo")
-    .args(["metadata", "--no-deps", "--format-version", "1"])
-    .output()?;
-
-  if !output.status.success() {
-    return Err(anyhow::anyhow!(
-      "cargo metadata command exited with a non zero exit code: {}",
-      String::from_utf8(output.stderr)?
-    ));
-  }
-
-  Ok(serde_json::from_slice::<CargoMetadata>(&output.stdout)?.workspace_root)
-}
diff --git a/crates/tauri/Cargo.toml b/crates/tauri/Cargo.toml
index e7a39710fa7d..d5492ed72195 100644
--- a/crates/tauri/Cargo.toml
+++ b/crates/tauri/Cargo.toml
@@ -150,7 +150,7 @@ serde = { version = "1", features = ["derive"] }
 serde_json = "1"
 tauri = { path = ".", default-features = false, features = ["wry"] }
 tokio = { version = "1", features = ["full"] }
-cargo_toml = "0.17"
+cargo_toml = "0.21"
 http-range = "0.1.5"
 
 # macOS