diff --git a/codegen/src/sqlstate.rs b/codegen/src/sqlstate.rs
index d21b92eec..9b9be6c54 100644
--- a/codegen/src/sqlstate.rs
+++ b/codegen/src/sqlstate.rs
@@ -72,7 +72,6 @@ fn make_code(codes: &LinkedHashMap<String, Vec<String>>, file: &mut BufWriter<Fi
             file,
             r#"
             Inner::E{code} => "{code}","#,
-            code = code,
         )
         .unwrap();
     }
@@ -97,8 +96,6 @@ fn make_consts(codes: &LinkedHashMap<String, Vec<String>>, file: &mut BufWriter<
     /// {code}
     pub const {name}: SqlState = SqlState(Inner::E{code});
 "#,
-                name = name,
-                code = code,
             )
             .unwrap();
         }
@@ -121,8 +118,7 @@ enum Inner {{"#,
         write!(
             file,
             r#"
-    E{},"#,
-            code,
+    E{code},"#,
         )
         .unwrap();
     }
diff --git a/codegen/src/type_gen.rs b/codegen/src/type_gen.rs
index fd7a56450..1b80a5101 100644
--- a/codegen/src/type_gen.rs
+++ b/codegen/src/type_gen.rs
@@ -237,7 +237,7 @@ fn parse_types() -> BTreeMap<u32, Type> {
         let doc_name = array_re.replace(&name, "$1[]").to_ascii_uppercase();
         let mut doc = doc_name.clone();
         if let Some(descr) = raw_type.get("descr") {
-            write!(doc, " - {}", descr).unwrap();
+            write!(doc, " - {descr}").unwrap();
         }
         let doc = Escape::new(doc.as_bytes().iter().cloned()).collect();
         let doc = String::from_utf8(doc).unwrap();
@@ -245,10 +245,10 @@ fn parse_types() -> BTreeMap<u32, Type> {
         if let Some(array_type_oid) = raw_type.get("array_type_oid") {
             let array_type_oid = array_type_oid.parse::<u32>().unwrap();
 
-            let name = format!("_{}", name);
-            let variant = format!("{}Array", variant);
-            let doc = format!("{}&#91;&#93;", doc_name);
-            let ident = format!("{}_ARRAY", ident);
+            let name = format!("_{name}");
+            let variant = format!("{variant}Array");
+            let doc = format!("{doc_name}&#91;&#93;");
+            let ident = format!("{ident}_ARRAY");
 
             let type_ = Type {
                 name,
diff --git a/postgres-derive-test/src/lib.rs b/postgres-derive-test/src/lib.rs
index f0534f32c..5c0b63413 100644
--- a/postgres-derive-test/src/lib.rs
+++ b/postgres-derive-test/src/lib.rs
@@ -21,7 +21,7 @@ where
         let result = conn.query_one(&stmt, &[]).unwrap().get(0);
         assert_eq!(val, &result);
 
-        let stmt = conn.prepare(&format!("SELECT $1::{}", sql_type)).unwrap();
+        let stmt = conn.prepare(&format!("SELECT $1::{sql_type}")).unwrap();
         let result = conn.query_one(&stmt, &[val]).unwrap().get(0);
         assert_eq!(val, &result);
     }
@@ -45,7 +45,7 @@ pub fn test_type_asymmetric<T, F, S, C>(
         let result: F = conn.query_one(&stmt, &[]).unwrap().get(0);
         assert!(cmp(val, &result));
 
-        let stmt = conn.prepare(&format!("SELECT $1::{}", sql_type)).unwrap();
+        let stmt = conn.prepare(&format!("SELECT $1::{sql_type}")).unwrap();
         let result: F = conn.query_one(&stmt, &[val]).unwrap().get(0);
         assert!(cmp(val, &result));
     }
diff --git a/postgres-derive/src/overrides.rs b/postgres-derive/src/overrides.rs
index d50550bee..712d13aac 100644
--- a/postgres-derive/src/overrides.rs
+++ b/postgres-derive/src/overrides.rs
@@ -65,7 +65,7 @@ impl Overrides {
                                         "invalid rename_all rule, expected one of: {}",
                                         RENAME_RULES
                                             .iter()
-                                            .map(|rule| format!("\"{}\"", rule))
+                                            .map(|rule| format!("\"{rule}\""))
                                             .collect::<Vec<_>>()
                                             .join(", ")
                                     ),
diff --git a/postgres-derive/src/tosql.rs b/postgres-derive/src/tosql.rs
index 81d4834bf..e16117aa3 100644
--- a/postgres-derive/src/tosql.rs
+++ b/postgres-derive/src/tosql.rs
@@ -196,7 +196,7 @@ fn composite_body(fields: &[Field]) -> TokenStream {
                 postgres_types::IsNull::Yes => -1,
                 postgres_types::IsNull::No => {
                     let len = buf.len() - base - 4;
-                    if len > i32::max_value() as usize {
+                    if len > i32::MAX as usize {
                         return std::result::Result::Err(
                             std::convert::Into::into("value too large to transmit"));
                     }
diff --git a/postgres-protocol/src/authentication/mod.rs b/postgres-protocol/src/authentication/mod.rs
index 71afa4b9b..efe7ce778 100644
--- a/postgres-protocol/src/authentication/mod.rs
+++ b/postgres-protocol/src/authentication/mod.rs
@@ -14,7 +14,7 @@ pub fn md5_hash(username: &[u8], password: &[u8], salt: [u8; 4]) -> String {
     md5.update(password);
     md5.update(username);
     let output = md5.finalize_reset();
-    md5.update(format!("{:x}", output));
+    md5.update(format!("{output:x}"));
     md5.update(salt);
     format!("md5{:x}", md5.finalize())
 }
diff --git a/postgres-protocol/src/authentication/sasl.rs b/postgres-protocol/src/authentication/sasl.rs
index 85a589c99..d391e897c 100644
--- a/postgres-protocol/src/authentication/sasl.rs
+++ b/postgres-protocol/src/authentication/sasl.rs
@@ -262,7 +262,7 @@ impl ScramSha256 {
 
         let verifier = match parsed {
             ServerFinalMessage::Error(e) => {
-                return Err(io::Error::other(format!("SCRAM error: {}", e)));
+                return Err(io::Error::other(format!("SCRAM error: {e}")));
             }
             ServerFinalMessage::Verifier(verifier) => verifier,
         };
@@ -302,10 +302,8 @@ impl<'a> Parser<'a> {
         match self.it.next() {
             Some((_, c)) if c == target => Ok(()),
             Some((i, c)) => {
-                let m = format!(
-                    "unexpected character at byte {}: expected `{}` but got `{}",
-                    i, target, c
-                );
+                let m =
+                    format!("unexpected character at byte {i}: expected `{target}` but got `{c}");
                 Err(io::Error::new(io::ErrorKind::InvalidInput, m))
             }
             None => Err(io::Error::new(
@@ -371,7 +369,7 @@ impl<'a> Parser<'a> {
         match self.it.peek() {
             Some(&(i, _)) => Err(io::Error::new(
                 io::ErrorKind::InvalidInput,
-                format!("unexpected trailing data at byte {}", i),
+                format!("unexpected trailing data at byte {i}"),
             )),
             None => Ok(()),
         }
diff --git a/postgres-protocol/src/message/backend.rs b/postgres-protocol/src/message/backend.rs
index 013bfbb81..f64de84d9 100644
--- a/postgres-protocol/src/message/backend.rs
+++ b/postgres-protocol/src/message/backend.rs
@@ -235,7 +235,7 @@ impl Message {
                 tag => {
                     return Err(io::Error::new(
                         io::ErrorKind::InvalidInput,
-                        format!("unknown authentication tag `{}`", tag),
+                        format!("unknown authentication tag `{tag}`"),
                     ));
                 }
             },
@@ -262,7 +262,7 @@ impl Message {
             tag => {
                 return Err(io::Error::new(
                     io::ErrorKind::InvalidInput,
-                    format!("unknown message tag `{}`", tag),
+                    format!("unknown message tag `{tag}`"),
                 ));
             }
         };
diff --git a/postgres-protocol/src/password/mod.rs b/postgres-protocol/src/password/mod.rs
index 445fb0c0e..de070cf21 100644
--- a/postgres-protocol/src/password/mod.rs
+++ b/postgres-protocol/src/password/mod.rs
@@ -102,5 +102,5 @@ pub fn md5(password: &[u8], username: &str) -> String {
     let mut hash = Md5::new();
     hash.update(&salted_password);
     let digest = hash.finalize();
-    format!("md5{:x}", digest)
+    format!("md5{digest:x}")
 }
diff --git a/postgres-types/src/chrono_04.rs b/postgres-types/src/chrono_04.rs
index d599bde02..007ddb04c 100644
--- a/postgres-types/src/chrono_04.rs
+++ b/postgres-types/src/chrono_04.rs
@@ -3,7 +3,7 @@ use chrono_04::{
     DateTime, Duration, FixedOffset, Local, NaiveDate, NaiveDateTime, NaiveTime, TimeZone, Utc,
 };
 use postgres_protocol::types;
-use std::error::Error;
+use std::{convert::TryFrom, error::Error};
 
 use crate::{FromSql, IsNull, ToSql, Type};
 
@@ -123,11 +123,9 @@ impl<'a> FromSql<'a> for NaiveDate {
 impl ToSql for NaiveDate {
     fn to_sql(&self, _: &Type, w: &mut BytesMut) -> Result<IsNull, Box<dyn Error + Sync + Send>> {
         let jd = self.signed_duration_since(base().date()).num_days();
-        if jd > i64::from(i32::max_value()) || jd < i64::from(i32::min_value()) {
-            return Err("value too large to transmit".into());
-        }
+        let jd = i32::try_from(jd).map_err(|_| "value too large to transmit")?;
 
-        types::date_to_sql(jd as i32, w);
+        types::date_to_sql(jd, w);
         Ok(IsNull::No)
     }
 
diff --git a/postgres-types/src/lib.rs b/postgres-types/src/lib.rs
index 51137b6b4..6aba69501 100644
--- a/postgres-types/src/lib.rs
+++ b/postgres-types/src/lib.rs
@@ -319,7 +319,7 @@ impl fmt::Display for Type {
     fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
         match self.schema() {
             "public" | "pg_catalog" => {}
-            schema => write!(fmt, "{}.", schema)?,
+            schema => write!(fmt, "{schema}.")?,
         }
         fmt.write_str(self.name())
     }
@@ -631,16 +631,14 @@ impl<'a, T: FromSql<'a>, const N: usize> FromSql<'a> for [T; N] {
             let v = values
                 .next()?
                 .ok_or_else(|| -> Box<dyn Error + Sync + Send> {
-                    format!("too few elements in array (expected {}, got {})", N, i).into()
+                    format!("too few elements in array (expected {N}, got {i})").into()
                 })?;
             T::from_sql_nullable(member_type, v)
         })?;
         if values.next()?.is_some() {
-            return Err(format!(
-                "excess elements in array (expected {}, got more than that)",
-                N,
-            )
-            .into());
+            return Err(
+                format!("excess elements in array (expected {N}, got more than that)",).into(),
+            );
         }
 
         Ok(out)
diff --git a/postgres-types/src/pg_lsn.rs b/postgres-types/src/pg_lsn.rs
index f339f9689..51004b329 100644
--- a/postgres-types/src/pg_lsn.rs
+++ b/postgres-types/src/pg_lsn.rs
@@ -52,7 +52,7 @@ impl fmt::Display for PgLsn {
 
 impl fmt::Debug for PgLsn {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        f.write_fmt(format_args!("{}", self))
+        fmt::Display::fmt(self, f)
     }
 }
 
diff --git a/postgres-types/src/time_02.rs b/postgres-types/src/time_02.rs
index 19a8909e7..47c98757d 100644
--- a/postgres-types/src/time_02.rs
+++ b/postgres-types/src/time_02.rs
@@ -72,11 +72,9 @@ impl<'a> FromSql<'a> for Date {
 impl ToSql for Date {
     fn to_sql(&self, _: &Type, w: &mut BytesMut) -> Result<IsNull, Box<dyn Error + Sync + Send>> {
         let jd = (*self - base().date()).whole_days();
-        if jd > i64::from(i32::max_value()) || jd < i64::from(i32::min_value()) {
-            return Err("value too large to transmit".into());
-        }
+        let jd = i32::try_from(jd).map_err(|_| "value too large to transmit")?;
 
-        types::date_to_sql(jd as i32, w);
+        types::date_to_sql(jd, w);
         Ok(IsNull::No)
     }
 
diff --git a/postgres-types/src/time_03.rs b/postgres-types/src/time_03.rs
index 4deea663f..2c2904d11 100644
--- a/postgres-types/src/time_03.rs
+++ b/postgres-types/src/time_03.rs
@@ -76,11 +76,9 @@ impl<'a> FromSql<'a> for Date {
 impl ToSql for Date {
     fn to_sql(&self, _: &Type, w: &mut BytesMut) -> Result<IsNull, Box<dyn Error + Sync + Send>> {
         let jd = (*self - base().date()).whole_days();
-        if jd > i64::from(i32::max_value()) || jd < i64::from(i32::min_value()) {
-            return Err("value too large to transmit".into());
-        }
+        let jd = i32::try_from(jd).map_err(|_| "value too large to transmit")?;
 
-        types::date_to_sql(jd as i32, w);
+        types::date_to_sql(jd, w);
         Ok(IsNull::No)
     }
 
diff --git a/tokio-postgres/src/config.rs b/tokio-postgres/src/config.rs
index 59edd8fe2..dfe34dea6 100644
--- a/tokio-postgres/src/config.rs
+++ b/tokio-postgres/src/config.rs
@@ -872,10 +872,8 @@ impl<'a> Parser<'a> {
         match self.it.next() {
             Some((_, c)) if c == target => Ok(()),
             Some((i, c)) => {
-                let m = format!(
-                    "unexpected character at byte {}: expected `{}` but got `{}`",
-                    i, target, c
-                );
+                let m =
+                    format!("unexpected character at byte {i}: expected `{target}` but got `{c}`");
                 Err(Error::config_parse(m.into()))
             }
             None => Err(Error::config_parse("unexpected EOF".into())),
diff --git a/tokio-postgres/src/connect_socket.rs b/tokio-postgres/src/connect_socket.rs
index 26184701f..0001cef19 100644
--- a/tokio-postgres/src/connect_socket.rs
+++ b/tokio-postgres/src/connect_socket.rs
@@ -45,7 +45,7 @@ pub(crate) async fn connect_socket(
         }
         #[cfg(unix)]
         Addr::Unix(dir) => {
-            let path = dir.join(format!(".s.PGSQL.{}", port));
+            let path = dir.join(format!(".s.PGSQL.{port}"));
             let socket = connect_with_timeout(UnixStream::connect(path), connect_timeout).await?;
             Ok(Socket::new_unix(socket))
         }
diff --git a/tokio-postgres/src/error/mod.rs b/tokio-postgres/src/error/mod.rs
index 75664d258..5d4c87eb0 100644
--- a/tokio-postgres/src/error/mod.rs
+++ b/tokio-postgres/src/error/mod.rs
@@ -312,10 +312,10 @@ impl fmt::Display for DbError {
     fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
         write!(fmt, "{}: {}", self.severity, self.message)?;
         if let Some(detail) = &self.detail {
-            write!(fmt, "\nDETAIL: {}", detail)?;
+            write!(fmt, "\nDETAIL: {detail}")?;
         }
         if let Some(hint) = &self.hint {
-            write!(fmt, "\nHINT: {}", hint)?;
+            write!(fmt, "\nHINT: {hint}")?;
         }
         Ok(())
     }
@@ -382,9 +382,9 @@ impl fmt::Display for Error {
             Kind::Io => fmt.write_str("error communicating with the server")?,
             Kind::UnexpectedMessage => fmt.write_str("unexpected message from server")?,
             Kind::Tls => fmt.write_str("error performing TLS handshake")?,
-            Kind::ToSql(idx) => write!(fmt, "error serializing parameter {}", idx)?,
-            Kind::FromSql(idx) => write!(fmt, "error deserializing column {}", idx)?,
-            Kind::Column(column) => write!(fmt, "invalid column `{}`", column)?,
+            Kind::ToSql(idx) => write!(fmt, "error serializing parameter {idx}")?,
+            Kind::FromSql(idx) => write!(fmt, "error deserializing column {idx}")?,
+            Kind::Column(column) => write!(fmt, "invalid column `{column}`")?,
             Kind::Parameters(real, expected) => {
                 write!(fmt, "expected {expected} parameters but got {real}")?
             }
@@ -401,7 +401,7 @@ impl fmt::Display for Error {
             Kind::Timeout => fmt.write_str("timeout waiting for server")?,
         };
         if let Some(ref cause) = self.0.cause {
-            write!(fmt, ": {}", cause)?;
+            write!(fmt, ": {cause}")?;
         }
         Ok(())
     }
diff --git a/tokio-postgres/src/prepare.rs b/tokio-postgres/src/prepare.rs
index 1d9bacb16..a238b6807 100644
--- a/tokio-postgres/src/prepare.rs
+++ b/tokio-postgres/src/prepare.rs
@@ -118,9 +118,9 @@ fn prepare_rec<'a>(
 
 fn encode(client: &InnerClient, name: &str, query: &str, types: &[Type]) -> Result<Bytes, Error> {
     if types.is_empty() {
-        debug!("preparing query {}: {}", name, query);
+        debug!("preparing query {name}: {query}");
     } else {
-        debug!("preparing query {} with types {:?}: {}", name, types, query);
+        debug!("preparing query {name} with types {types:?}: {query}");
     }
 
     client.with_buf(|buf| {
diff --git a/tokio-postgres/src/simple_query.rs b/tokio-postgres/src/simple_query.rs
index 24473b896..d94bbde44 100644
--- a/tokio-postgres/src/simple_query.rs
+++ b/tokio-postgres/src/simple_query.rs
@@ -33,7 +33,7 @@ impl SimpleColumn {
 }
 
 pub async fn simple_query(client: &InnerClient, query: &str) -> Result<SimpleQueryStream, Error> {
-    debug!("executing simple query: {}", query);
+    debug!("executing simple query: {query}");
 
     let buf = encode(client, query)?;
     let responses = client.send(RequestMessages::Single(FrontendMessage::Raw(buf)))?;
@@ -46,7 +46,7 @@ pub async fn simple_query(client: &InnerClient, query: &str) -> Result<SimpleQue
 }
 
 pub async fn batch_execute(client: &InnerClient, query: &str) -> Result<(), Error> {
-    debug!("executing statement batch: {}", query);
+    debug!("executing statement batch: {query}");
 
     let buf = encode(client, query)?;
     let mut responses = client.send(RequestMessages::Single(FrontendMessage::Raw(buf)))?;
diff --git a/tokio-postgres/src/transaction.rs b/tokio-postgres/src/transaction.rs
index 782c476c4..de84a3611 100644
--- a/tokio-postgres/src/transaction.rs
+++ b/tokio-postgres/src/transaction.rs
@@ -314,8 +314,8 @@ impl<'a> Transaction<'a> {
 
     async fn _savepoint(&mut self, name: Option<String>) -> Result<Transaction<'_>, Error> {
         let depth = self.savepoint.as_ref().map_or(0, |sp| sp.depth) + 1;
-        let name = name.unwrap_or_else(|| format!("sp_{}", depth));
-        let query = format!("SAVEPOINT {}", name);
+        let name = name.unwrap_or_else(|| format!("sp_{depth}"));
+        let query = format!("SAVEPOINT {name}");
         self.batch_execute(&query).await?;
 
         Ok(Transaction {
diff --git a/tokio-postgres/tests/test/binary_copy.rs b/tokio-postgres/tests/test/binary_copy.rs
index 94b96ab85..712ee8e07 100644
--- a/tokio-postgres/tests/test/binary_copy.rs
+++ b/tokio-postgres/tests/test/binary_copy.rs
@@ -56,7 +56,7 @@ async fn write_many_rows() {
     for i in 0..10_000i32 {
         writer
             .as_mut()
-            .write(&[&i, &format!("the value for {}", i)])
+            .write(&[&i, &format!("the value for {i}")])
             .await
             .unwrap();
     }
@@ -69,7 +69,7 @@ async fn write_many_rows() {
         .unwrap();
     for (i, row) in rows.iter().enumerate() {
         assert_eq!(row.get::<_, i32>(0), i as i32);
-        assert_eq!(row.get::<_, &str>(1), format!("the value for {}", i));
+        assert_eq!(row.get::<_, &str>(1), format!("the value for {i}"));
     }
 }
 
@@ -164,7 +164,7 @@ async fn read_many_rows() {
 
     for (i, row) in rows.iter().enumerate() {
         assert_eq!(row.get::<i32>(0), i as i32);
-        assert_eq!(row.get::<&str>(1), format!("the value for {}", i));
+        assert_eq!(row.get::<&str>(1), format!("the value for {i}"));
     }
 }
 
diff --git a/tokio-postgres/tests/test/main.rs b/tokio-postgres/tests/test/main.rs
index 9a6aa26fe..bac008f08 100644
--- a/tokio-postgres/tests/test/main.rs
+++ b/tokio-postgres/tests/test/main.rs
@@ -624,11 +624,11 @@ async fn copy_in_large() {
     let a = Bytes::from_static(b"0\tname0\n");
     let mut b = BytesMut::new();
     for i in 1..5_000 {
-        writeln!(b, "{0}\tname{0}", i).unwrap();
+        writeln!(b, "{i}\tname{i}").unwrap();
     }
     let mut c = BytesMut::new();
     for i in 5_000..10_000 {
-        writeln!(c, "{0}\tname{0}", i).unwrap();
+        writeln!(c, "{i}\tname{i}").unwrap();
     }
     let mut stream = stream::iter(
         vec![a, b.freeze(), c.freeze()]
@@ -704,7 +704,7 @@ async fn copy_out() {
 async fn notices() {
     let long_name = "x".repeat(65);
     let (client, mut connection) =
-        connect_raw(&format!("user=postgres application_name={}", long_name,))
+        connect_raw(&format!("user=postgres application_name={long_name}",))
             .await
             .unwrap();
 
diff --git a/tokio-postgres/tests/test/parse.rs b/tokio-postgres/tests/test/parse.rs
index 35eeca72b..68ce33bdf 100644
--- a/tokio-postgres/tests/test/parse.rs
+++ b/tokio-postgres/tests/test/parse.rs
@@ -2,7 +2,7 @@ use std::time::Duration;
 use tokio_postgres::config::{Config, SslNegotiation, TargetSessionAttrs};
 
 fn check(s: &str, config: &Config) {
-    assert_eq!(s.parse::<Config>().expect(s), *config, "`{}`", s);
+    assert_eq!(s.parse::<Config>().expect(s), *config, "`{s}`");
 }
 
 #[test]
diff --git a/tokio-postgres/tests/test/types/chrono_04.rs b/tokio-postgres/tests/test/types/chrono_04.rs
index eda8151a6..fd5c11a47 100644
--- a/tokio-postgres/tests/test/types/chrono_04.rs
+++ b/tokio-postgres/tests/test/types/chrono_04.rs
@@ -166,7 +166,7 @@ async fn test_special_params_without_wrapper() {
         T: FromSqlOwned + fmt::Debug,
     {
         let err = client
-            .query_one(&*format!("SELECT {}::{}", val, sql_type), &[])
+            .query_one(&*format!("SELECT {val}::{sql_type}"), &[])
             .await
             .unwrap()
             .try_get::<_, T>(0)
diff --git a/tokio-postgres/tests/test/types/jiff_01.rs b/tokio-postgres/tests/test/types/jiff_01.rs
index 7c9052676..1bd1e26e8 100644
--- a/tokio-postgres/tests/test/types/jiff_01.rs
+++ b/tokio-postgres/tests/test/types/jiff_01.rs
@@ -140,7 +140,7 @@ async fn test_special_params_without_wrapper() {
         T: FromSqlOwned + fmt::Debug,
     {
         let err = client
-            .query_one(&*format!("SELECT {}::{}", val, sql_type), &[])
+            .query_one(&*format!("SELECT {val}::{sql_type}"), &[])
             .await
             .unwrap()
             .try_get::<_, T>(0)
@@ -152,7 +152,7 @@ async fn test_special_params_without_wrapper() {
         );
 
         let err = client
-            .query_one(&*format!("SELECT {}::{}", val, sql_type), &[])
+            .query_one(&*format!("SELECT {val}::{sql_type}"), &[])
             .await
             .unwrap()
             .try_get::<_, T>(0)
diff --git a/tokio-postgres/tests/test/types/jiff_02.rs b/tokio-postgres/tests/test/types/jiff_02.rs
index d13185589..92f85e817 100644
--- a/tokio-postgres/tests/test/types/jiff_02.rs
+++ b/tokio-postgres/tests/test/types/jiff_02.rs
@@ -140,7 +140,7 @@ async fn test_special_params_without_wrapper() {
         T: FromSqlOwned + fmt::Debug,
     {
         let err = client
-            .query_one(&*format!("SELECT {}::{}", val, sql_type), &[])
+            .query_one(&*format!("SELECT {val}::{sql_type}"), &[])
             .await
             .unwrap()
             .try_get::<_, T>(0)
@@ -152,7 +152,7 @@ async fn test_special_params_without_wrapper() {
         );
 
         let err = client
-            .query_one(&*format!("SELECT {}::{}", val, sql_type), &[])
+            .query_one(&*format!("SELECT {val}::{sql_type}"), &[])
             .await
             .unwrap()
             .try_get::<_, T>(0)
diff --git a/tokio-postgres/tests/test/types/mod.rs b/tokio-postgres/tests/test/types/mod.rs
index 41c4a8899..c3a5735f1 100644
--- a/tokio-postgres/tests/test/types/mod.rs
+++ b/tokio-postgres/tests/test/types/mod.rs
@@ -49,14 +49,14 @@ where
 
     for (val, repr) in checks {
         let rows = client
-            .query(&*format!("SELECT {}::{}", repr, sql_type), &[])
+            .query(&*format!("SELECT {repr}::{sql_type}"), &[])
             .await
             .unwrap();
         let result = rows[0].get(0);
         assert_eq!(val, &result);
 
         let rows = client
-            .query(&*format!("SELECT $1::{}", sql_type), &[&val])
+            .query(&*format!("SELECT $1::{sql_type}"), &[&val])
             .await
             .unwrap();
         let result = rows[0].get(0);
@@ -391,7 +391,7 @@ where
     let client = connect("user=postgres").await;
 
     let stmt = client
-        .prepare(&format!("SELECT 'NaN'::{}", sql_type))
+        .prepare(&format!("SELECT 'NaN'::{sql_type}"))
         .await
         .unwrap();
     let rows = client.query(&stmt, &[]).await.unwrap();
diff --git a/tokio-postgres/tests/test/types/time_03.rs b/tokio-postgres/tests/test/types/time_03.rs
index fca940a97..5c499e7b6 100644
--- a/tokio-postgres/tests/test/types/time_03.rs
+++ b/tokio-postgres/tests/test/types/time_03.rs
@@ -161,7 +161,7 @@ async fn test_special_params_without_wrapper() {
         T: FromSqlOwned + fmt::Debug,
     {
         let err = client
-            .query_one(&*format!("SELECT {}::{}", val, sql_type), &[])
+            .query_one(&*format!("SELECT {val}::{sql_type}"), &[])
             .await
             .unwrap()
             .try_get::<_, T>(0)