diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 9006ec29..612fbc14 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: stable
+            toolchain: 1.66.0
             components: rustfmt, clippy
             override: true
       - name: rustfmt
@@ -52,8 +52,8 @@ jobs:
       - uses: actions/checkout@v1
       - uses: actions-rs/toolchain@v1
         with:
-            toolchain: stable
-            components: rustfmt
+            toolchain: 1.65.0
+            components: rustfmt, clippy
             override: true
       - name: rustfmt
         run: cd gui && cargo fmt -- --check
diff --git a/clippy.toml b/clippy.toml
deleted file mode 100644
index f691ea3d..00000000
--- a/clippy.toml
+++ /dev/null
@@ -1 +0,0 @@
-msrv = "1.48"
diff --git a/src/commands/mod.rs b/src/commands/mod.rs
index 06903489..64a4bc08 100644
--- a/src/commands/mod.rs
+++ b/src/commands/mod.rs
@@ -234,6 +234,7 @@ impl DaemonControl {
     /// Get a list of all known coins.
     pub fn list_coins(&self) -> ListCoinsResult {
         let mut db_conn = self.db.connection();
+        #[allow(clippy::iter_kv_map)] // Because Rust 1.48
         let coins: Vec<ListCoinsEntry> = db_conn
             .coins(CoinType::All)
             // Can't use into_values as of Rust 1.48
@@ -381,10 +382,7 @@ impl DaemonControl {
                 .ok_or(CommandError::InsufficientFunds(
                     in_value, out_value, feerate_vb,
                 ))?;
-        let nochange_feerate_vb = absolute_fee
-            .to_sat()
-            .checked_div(nochange_vb as u64)
-            .unwrap();
+        let nochange_feerate_vb = absolute_fee.to_sat().checked_div(nochange_vb).unwrap();
         if nochange_feerate_vb.checked_mul(10).unwrap() < feerate_vb.checked_mul(9).unwrap() {
             return Err(CommandError::InsufficientFunds(
                 in_value, out_value, feerate_vb,
diff --git a/src/commands/utils.rs b/src/commands/utils.rs
index b10a95fe..58fe4972 100644
--- a/src/commands/utils.rs
+++ b/src/commands/utils.rs
@@ -33,7 +33,7 @@ where
     T: consensus::Decodable,
 {
     let s = String::deserialize(d)?;
-    let s = base64::decode(&s).map_err(de::Error::custom)?;
+    let s = base64::decode(s).map_err(de::Error::custom)?;
     consensus::deserialize(&s).map_err(de::Error::custom)
 }
 
diff --git a/src/config.rs b/src/config.rs
index 111a438b..dc6b831b 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -188,7 +188,7 @@ impl Config {
         let config_file =
             custom_path.unwrap_or(config_file_path().ok_or(ConfigError::DatadirNotFound)?);
 
-        let config = toml::from_slice::<Config>(&std::fs::read(&config_file)?)
+        let config = toml::from_slice::<Config>(&std::fs::read(config_file)?)
             .map_err(|e| ConfigError::ReadingFile(format!("Parsing configuration file: {}", e)))?;
         config.check()?;
 
diff --git a/src/database/sqlite/mod.rs b/src/database/sqlite/mod.rs
index 9f8ca382..e9a3e88a 100644
--- a/src/database/sqlite/mod.rs
+++ b/src/database/sqlite/mod.rs
@@ -647,7 +647,7 @@ mod tests {
         db.sanity_check(bitcoin::Network::Bitcoin, &options.main_descriptor)
             .unwrap();
 
-        fs::remove_dir_all(&tmp_dir).unwrap();
+        fs::remove_dir_all(tmp_dir).unwrap();
     }
 
     #[test]
@@ -675,7 +675,7 @@ mod tests {
             assert_eq!(db_tip.block_hash.unwrap(), new_tip.hash);
         }
 
-        fs::remove_dir_all(&tmp_dir).unwrap();
+        fs::remove_dir_all(tmp_dir).unwrap();
     }
 
     #[test]
@@ -819,7 +819,7 @@ mod tests {
             assert_eq!(coin.spend_block.unwrap().height, height);
         }
 
-        fs::remove_dir_all(&tmp_dir).unwrap();
+        fs::remove_dir_all(tmp_dir).unwrap();
     }
 
     #[test]
@@ -916,7 +916,7 @@ mod tests {
             }
         }
 
-        fs::remove_dir_all(&tmp_dir).unwrap();
+        fs::remove_dir_all(tmp_dir).unwrap();
     }
 
     #[test]
@@ -1104,7 +1104,7 @@ mod tests {
             assert_eq!(db_coins[&coins[4].outpoint], coin);
         }
 
-        fs::remove_dir_all(&tmp_dir).unwrap();
+        fs::remove_dir_all(tmp_dir).unwrap();
     }
 
     #[test]
@@ -1142,7 +1142,7 @@ mod tests {
             assert_eq!(db_wallet.timestamp, dummy_timestamp);
         }
 
-        fs::remove_dir_all(&tmp_dir).unwrap();
+        fs::remove_dir_all(tmp_dir).unwrap();
     }
 
     #[test]
@@ -1295,6 +1295,6 @@ mod tests {
             );
         }
 
-        fs::remove_dir_all(&tmp_dir).unwrap();
+        fs::remove_dir_all(tmp_dir).unwrap();
     }
 }
diff --git a/src/jsonrpc/api.rs b/src/jsonrpc/api.rs
index 4b142bbf..b7c85e3d 100644
--- a/src/jsonrpc/api.rs
+++ b/src/jsonrpc/api.rs
@@ -105,11 +105,9 @@ fn list_confirmed(control: &DaemonControl, params: Params) -> Result<serde_json:
         .and_then(|i| i.try_into().ok())
         .ok_or_else(|| Error::invalid_params("Invalid 'limit' parameter."))?;
 
-    Ok(serde_json::json!(&control.list_confirmed_transactions(
-        start as u32,
-        end as u32,
-        limit
-    )))
+    Ok(serde_json::json!(
+        &control.list_confirmed_transactions(start, end, limit)
+    ))
 }
 
 fn list_transactions(control: &DaemonControl, params: Params) -> Result<serde_json::Value, Error> {