diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index cccad55d..d4e5a32c 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -9,7 +9,7 @@ jobs:
       - uses: actions/checkout@v1
       - uses: actions-rs/toolchain@v1
         with:
-            toolchain: 1.66.0
+            toolchain: 1.67.1
             components: rustfmt, clippy
             override: true
       - name: rustfmt
diff --git a/gui/src/app/state/mod.rs b/gui/src/app/state/mod.rs
index a6fc78dc..1d23f01b 100644
--- a/gui/src/app/state/mod.rs
+++ b/gui/src/app/state/mod.rs
@@ -172,7 +172,7 @@ impl State for Home {
             Message::View(view::Message::Next) => {
                 if let Some(last) = self.events.last() {
                     let daemon = daemon.clone();
-                    let last_event_date = last.time.unwrap() as u32;
+                    let last_event_date = last.time.unwrap();
                     return Command::perform(
                         async move {
                             let mut limit = view::home::HISTORY_EVENT_PAGE_SIZE;
@@ -284,7 +284,7 @@ impl State for ReceivePanel {
             match res {
                 Ok(address) => {
                     self.warning = None;
-                    self.qr_code = Some(qr_code::State::new(&address.to_qr_uri()).unwrap());
+                    self.qr_code = Some(qr_code::State::new(address.to_qr_uri()).unwrap());
                     self.address = Some(address);
                 }
                 Err(e) => self.warning = Some(e),
diff --git a/gui/src/daemon/client/mod.rs b/gui/src/daemon/client/mod.rs
index 80605201..4f27777c 100644
--- a/gui/src/daemon/client/mod.rs
+++ b/gui/src/daemon/client/mod.rs
@@ -96,7 +96,7 @@ impl<C: Client + Debug> Daemon for Lianad<C> {
     }
 
     fn update_spend_tx(&self, psbt: &Psbt) -> Result<(), DaemonError> {
-        let spend_tx = base64::encode(&consensus::serialize(psbt));
+        let spend_tx = base64::encode(consensus::serialize(psbt));
         let _res: serde_json::value::Value = self.call("updatespend", Some(vec![spend_tx]))?;
         Ok(())
     }
diff --git a/src/bitcoin/d/mod.rs b/src/bitcoin/d/mod.rs
index 311fbb2b..27494502 100644
--- a/src/bitcoin/d/mod.rs
+++ b/src/bitcoin/d/mod.rs
@@ -343,11 +343,11 @@ impl BitcoinD {
         }
     }
 
-    fn make_request_inner<'a, 'b>(
+    fn make_request_inner(
         &self,
         client: &Client,
-        method: &'a str,
-        params: &'b [Box<serde_json::value::RawValue>],
+        method: &str,
+        params: &[Box<serde_json::value::RawValue>],
         retry: bool,
     ) -> Result<Json, BitcoindError> {
         let req = client.build_request(method, params);
@@ -358,11 +358,11 @@ impl BitcoinD {
         }
     }
 
-    fn make_request<'a, 'b>(
+    fn make_request(
         &self,
         client: &Client,
-        method: &'a str,
-        params: &'b [Box<serde_json::value::RawValue>],
+        method: &str,
+        params: &[Box<serde_json::value::RawValue>],
     ) -> Result<Json, BitcoindError> {
         self.make_request_inner(client, method, params, true)
     }