diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index e164fe0..f99fef5 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -28,7 +28,7 @@ jobs:
       - name: Install Rust
         uses: dtolnay/rust-toolchain@stable
         with:
-          toolchain: 1.74.0
+          toolchain: stable
       - name: cargo build
         run: cargo build --release --features ${{ matrix.feature }}
       - name: Create release directory
@@ -66,7 +66,7 @@ jobs:
       - name: Install Rust
         uses: dtolnay/rust-toolchain@stable
         with:
-          toolchain: 1.74.0
+          toolchain: stable
       - name: Install cargo bundle
         run: cargo install cargo-bundle
       - name: cargo build
@@ -92,7 +92,7 @@ jobs:
       - name: Install Rust
         uses: dtolnay/rust-toolchain@stable
         with:
-          toolchain: 1.74.0
+          toolchain: stable
       - name: cargo build
         run: cargo build --release
       - name: Download butler
diff --git a/changelog.md b/changelog.md
index f612491..2d346e7 100644
--- a/changelog.md
+++ b/changelog.md
@@ -1,5 +1,10 @@
 # 0.2.x
 
+## 0.2.4
+
+- Fixed clippy warnings for Rust 1.78
+- The GitHub workflow for building Cacophony now uses the latest version of Rust.
+
 ## 0.2.3
 
 - Optimized text and rectangle rendering, which reduces CPU usage by around 5%.
diff --git a/common/src/u64_or_f32.rs b/common/src/u64_or_f32.rs
index a7d94f2..b84b75e 100644
--- a/common/src/u64_or_f32.rs
+++ b/common/src/u64_or_f32.rs
@@ -1,6 +1,6 @@
 use serde::de::{Error, Visitor};
 use serde::{Deserialize, Serialize};
-use std::fmt;
+use std::fmt::{self, Display};
 
 /// A value that is expressed as a u64 or an f32.
 #[derive(Debug, PartialEq, Copy, Clone, Default)]
@@ -46,9 +46,9 @@ impl From<f32> for U64orF32 {
     }
 }
 
-impl ToString for U64orF32 {
-    fn to_string(&self) -> String {
-        self.u.to_string()
+impl Display for U64orF32 {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "{}", self.u)
     }
 }
 
diff --git a/input/src/lib.rs b/input/src/lib.rs
index 5e216e6..d8f8bfc 100644
--- a/input/src/lib.rs
+++ b/input/src/lib.rs
@@ -316,7 +316,7 @@ impl Input {
                 .iter()
                 .filter(|c| Self::is_valid_char(c))
                 .copied()
-                .collect(),
+                .collect::<Vec<char>>(),
         )
     }
 
@@ -329,7 +329,7 @@ impl Input {
                 .iter()
                 .filter(|c| Self::is_valid_char(c) && !ILLEGAL_FILENAME_CHARACTERS.contains(c))
                 .copied()
-                .collect(),
+                .collect::<Vec<char>>(),
         )
     }
 
@@ -358,7 +358,7 @@ impl Input {
                 .iter()
                 .filter(|c| c.is_ascii_digit())
                 .copied()
-                .collect(),
+                .collect::<Vec<char>>(),
         );
         // Try to get a value.
         match T::from_str(string.as_str()) {
@@ -369,7 +369,7 @@ impl Input {
     }
 
     /// Modify a string with qwerty input from this frame.
-    fn modify_string(&self, string: &mut String, chars: &Vec<char>) -> bool {
+    fn modify_string(&self, string: &mut String, chars: &[char]) -> bool {
         // Delete the last character.
         if self.backspace {
             string.pop().is_some()
diff --git a/io/src/export_panel.rs b/io/src/export_panel.rs
index 813dd94..905bb91 100644
--- a/io/src/export_panel.rs
+++ b/io/src/export_panel.rs
@@ -34,7 +34,7 @@ impl Panel for ExportPanel {
         // We're done.
         let export_state = conn.export_state.lock();
         if *export_state == ExportState::NotExporting {
-            state.panels = self.panels.clone();
+            state.panels.clone_from(&self.panels);
             state.focus.set(self.focus);
         }
         None
diff --git a/io/src/lib.rs b/io/src/lib.rs
index 67036d6..cc6bb28 100644
--- a/io/src/lib.rs
+++ b/io/src/lib.rs
@@ -325,7 +325,7 @@ impl IO {
             // We aren't exporting already.
             if export_state == ExportState::NotExporting {
                 self.pre_export_focus = state.focus.get();
-                self.pre_export_panels = state.panels.clone();
+                self.pre_export_panels.clone_from(&state.panels);
                 self.open_file_panel.export(state, paths_state, conn)
             }
         } else if input.happened(&InputEvent::ImportMidi) {
diff --git a/io/src/popup.rs b/io/src/popup.rs
index abc86bd..1859581 100644
--- a/io/src/popup.rs
+++ b/io/src/popup.rs
@@ -13,14 +13,14 @@ impl Popup {
     /// Enable the panel. Store the state of the active panels. Set the state's active panels.
     pub fn enable(&mut self, state: &mut State, panels: Vec<PanelType>) {
         self.focus = state.focus.get();
-        self.panels = state.panels.clone();
+        self.panels.clone_from(&state.panels);
         state.panels = panels;
         state.focus = Index::new(0, state.panels.len());
     }
 
     /// Disable the panel. Set the state's active panels.
     pub fn disable(&self, state: &mut State) {
-        state.panels = self.panels.clone();
+        state.panels.clone_from(&self.panels);
         state.focus = Index::new(self.focus, self.panels.len());
     }
 }