diff --git a/libs/proxy/tokio-postgres2/src/client.rs b/libs/proxy/tokio-postgres2/src/client.rs
index d1d87306a6..733f685fa9 100644
--- a/libs/proxy/tokio-postgres2/src/client.rs
+++ b/libs/proxy/tokio-postgres2/src/client.rs
@@ -1,14 +1,12 @@
 use std::collections::HashMap;
 use std::fmt;
 use std::net::IpAddr;
-use std::sync::Arc;
 use std::task::{Context, Poll};
 use std::time::Duration;
 
 use bytes::BytesMut;
 use fallible_iterator::FallibleIterator;
 use futures_util::{TryStreamExt, future, ready};
-use parking_lot::Mutex;
 use postgres_protocol2::message::backend::Message;
 use postgres_protocol2::message::frontend;
 use serde::{Deserialize, Serialize};
@@ -68,7 +66,7 @@ pub struct InnerClient {
     sender: mpsc::UnboundedSender<Request>,
 
     /// A buffer to use when writing out postgres commands.
-    buffer: Mutex<BytesMut>,
+    buffer: BytesMut,
 }
 
 impl InnerClient {
@@ -85,13 +83,12 @@ impl InnerClient {
 
     /// Call the given function with a buffer to be used when writing out
     /// postgres commands.
-    pub fn with_buf<F, R>(&self, f: F) -> R
+    pub fn with_buf<F, R>(&mut self, f: F) -> R
     where
         F: FnOnce(&mut BytesMut) -> R,
     {
-        let mut buffer = self.buffer.lock();
-        let r = f(&mut buffer);
-        buffer.clear();
+        let r = f(&mut self.buffer);
+        self.buffer.clear();
         r
     }
 }
@@ -109,7 +106,7 @@ pub struct SocketConfig {
 /// The client is one half of what is returned when a connection is established. Users interact with the database
 /// through this client object.
 pub struct Client {
-    inner: Arc<InnerClient>,
+    inner: InnerClient,
     cached_typeinfo: CachedTypeInfo,
 
     socket_config: SocketConfig,
@@ -142,10 +139,10 @@ impl Client {
         secret_key: i32,
     ) -> Client {
         Client {
-            inner: Arc::new(InnerClient {
+            inner: InnerClient {
                 sender,
                 buffer: Default::default(),
-            }),
+            },
             cached_typeinfo: Default::default(),
 
             socket_config,
@@ -160,19 +157,23 @@ impl Client {
         self.process_id
     }
 
-    pub(crate) fn inner(&self) -> &Arc<InnerClient> {
-        &self.inner
+    pub(crate) fn inner(&mut self) -> &mut InnerClient {
+        &mut self.inner
     }
 
     /// Pass text directly to the Postgres backend to allow it to sort out typing itself and
     /// to save a roundtrip
-    pub async fn query_raw_txt<S, I>(&self, statement: &str, params: I) -> Result<RowStream, Error>
+    pub async fn query_raw_txt<S, I>(
+        &mut self,
+        statement: &str,
+        params: I,
+    ) -> Result<RowStream, Error>
     where
         S: AsRef<str>,
         I: IntoIterator<Item = Option<S>>,
         I::IntoIter: ExactSizeIterator,
     {
-        query::query_txt(&self.inner, statement, params).await
+        query::query_txt(&mut self.inner, statement, params).await
     }
 
     /// Executes a sequence of SQL statements using the simple query protocol, returning the resulting rows.
@@ -188,11 +189,14 @@ impl Client {
     /// Prepared statements should be use for any query which contains user-specified data, as they provided the
     /// functionality to safely embed that data in the request. Do not form statements via string concatenation and pass
     /// them to this method!
-    pub async fn simple_query(&self, query: &str) -> Result<Vec<SimpleQueryMessage>, Error> {
+    pub async fn simple_query(&mut self, query: &str) -> Result<Vec<SimpleQueryMessage>, Error> {
         self.simple_query_raw(query).await?.try_collect().await
     }
 
-    pub(crate) async fn simple_query_raw(&self, query: &str) -> Result<SimpleQueryStream, Error> {
+    pub(crate) async fn simple_query_raw(
+        &mut self,
+        query: &str,
+    ) -> Result<SimpleQueryStream, Error> {
         simple_query::simple_query(self.inner(), query).await
     }
 
@@ -206,7 +210,7 @@ impl Client {
     /// Prepared statements should be use for any query which contains user-specified data, as they provided the
     /// functionality to safely embed that data in the request. Do not form statements via string concatenation and pass
     /// them to this method!
-    pub async fn batch_execute(&self, query: &str) -> Result<ReadyForQueryStatus, Error> {
+    pub async fn batch_execute(&mut self, query: &str) -> Result<ReadyForQueryStatus, Error> {
         simple_query::batch_execute(self.inner(), query).await
     }
 
@@ -223,7 +227,7 @@ impl Client {
     /// The transaction will roll back by default - use the `commit` method to commit it.
     pub async fn transaction(&mut self) -> Result<Transaction<'_>, Error> {
         struct RollbackIfNotDone<'me> {
-            client: &'me Client,
+            client: &'me mut Client,
             done: bool,
         }
 
@@ -254,7 +258,7 @@ impl Client {
                 client: self,
                 done: false,
             };
-            self.batch_execute("BEGIN").await?;
+            cleaner.client.batch_execute("BEGIN").await?;
             cleaner.done = true;
         }
 
@@ -282,7 +286,7 @@ impl Client {
 
     /// Query for type information
     pub(crate) async fn get_type_inner(&mut self, oid: Oid) -> Result<Type, Error> {
-        crate::prepare::get_type(&self.inner, &mut self.cached_typeinfo, oid).await
+        crate::prepare::get_type(&mut self.inner, &mut self.cached_typeinfo, oid).await
     }
 
     /// Determines if the connection to the server has already closed.
diff --git a/libs/proxy/tokio-postgres2/src/generic_client.rs b/libs/proxy/tokio-postgres2/src/generic_client.rs
index 8e28843347..c426bf4676 100644
--- a/libs/proxy/tokio-postgres2/src/generic_client.rs
+++ b/libs/proxy/tokio-postgres2/src/generic_client.rs
@@ -15,7 +15,7 @@ mod private {
 /// This trait is "sealed", and cannot be implemented outside of this crate.
 pub trait GenericClient: private::Sealed {
     /// Like `Client::query_raw_txt`.
-    async fn query_raw_txt<S, I>(&self, statement: &str, params: I) -> Result<RowStream, Error>
+    async fn query_raw_txt<S, I>(&mut self, statement: &str, params: I) -> Result<RowStream, Error>
     where
         S: AsRef<str> + Sync + Send,
         I: IntoIterator<Item = Option<S>> + Sync + Send,
@@ -28,7 +28,7 @@ pub trait GenericClient: private::Sealed {
 impl private::Sealed for Client {}
 
 impl GenericClient for Client {
-    async fn query_raw_txt<S, I>(&self, statement: &str, params: I) -> Result<RowStream, Error>
+    async fn query_raw_txt<S, I>(&mut self, statement: &str, params: I) -> Result<RowStream, Error>
     where
         S: AsRef<str> + Sync + Send,
         I: IntoIterator<Item = Option<S>> + Sync + Send,
@@ -46,7 +46,7 @@ impl GenericClient for Client {
 impl private::Sealed for Transaction<'_> {}
 
 impl GenericClient for Transaction<'_> {
-    async fn query_raw_txt<S, I>(&self, statement: &str, params: I) -> Result<RowStream, Error>
+    async fn query_raw_txt<S, I>(&mut self, statement: &str, params: I) -> Result<RowStream, Error>
     where
         S: AsRef<str> + Sync + Send,
         I: IntoIterator<Item = Option<S>> + Sync + Send,
diff --git a/libs/proxy/tokio-postgres2/src/prepare.rs b/libs/proxy/tokio-postgres2/src/prepare.rs
index 8b6b363889..f7789632e3 100644
--- a/libs/proxy/tokio-postgres2/src/prepare.rs
+++ b/libs/proxy/tokio-postgres2/src/prepare.rs
@@ -1,6 +1,5 @@
 use std::future::Future;
 use std::pin::Pin;
-use std::sync::Arc;
 
 use bytes::Bytes;
 use fallible_iterator::FallibleIterator;
@@ -24,7 +23,7 @@ WHERE t.oid = $1
 ";
 
 async fn prepare_typecheck(
-    client: &Arc<InnerClient>,
+    client: &mut InnerClient,
     name: &'static str,
     query: &str,
     types: &[Type],
@@ -68,7 +67,12 @@ async fn prepare_typecheck(
     Ok(Statement::new(name, parameters, columns))
 }
 
-fn encode(client: &InnerClient, name: &str, query: &str, types: &[Type]) -> Result<Bytes, Error> {
+fn encode(
+    client: &mut InnerClient,
+    name: &str,
+    query: &str,
+    types: &[Type],
+) -> Result<Bytes, Error> {
     if types.is_empty() {
         debug!("preparing query {}: {}", name, query);
     } else {
@@ -84,7 +88,7 @@ fn encode(client: &InnerClient, name: &str, query: &str, types: &[Type]) -> Resu
 }
 
 pub async fn get_type(
-    client: &Arc<InnerClient>,
+    client: &mut InnerClient,
     typecache: &mut CachedTypeInfo,
     oid: Oid,
 ) -> Result<Type, Error> {
@@ -139,7 +143,7 @@ pub async fn get_type(
 }
 
 fn get_type_rec<'a>(
-    client: &'a Arc<InnerClient>,
+    client: &'a mut InnerClient,
     typecache: &'a mut CachedTypeInfo,
     oid: Oid,
 ) -> Pin<Box<dyn Future<Output = Result<Type, Error>> + Send + 'a>> {
@@ -147,7 +151,7 @@ fn get_type_rec<'a>(
 }
 
 async fn typeinfo_statement(
-    client: &Arc<InnerClient>,
+    client: &mut InnerClient,
     typecache: &mut CachedTypeInfo,
 ) -> Result<Statement, Error> {
     if let Some(stmt) = &typecache.typeinfo {
diff --git a/libs/proxy/tokio-postgres2/src/query.rs b/libs/proxy/tokio-postgres2/src/query.rs
index 106bc69d49..bda8e74d7d 100644
--- a/libs/proxy/tokio-postgres2/src/query.rs
+++ b/libs/proxy/tokio-postgres2/src/query.rs
@@ -1,7 +1,6 @@
 use std::fmt;
 use std::marker::PhantomPinned;
 use std::pin::Pin;
-use std::sync::Arc;
 use std::task::{Context, Poll};
 
 use bytes::{BufMut, Bytes, BytesMut};
@@ -28,7 +27,7 @@ impl fmt::Debug for BorrowToSqlParamsDebug<'_> {
 }
 
 pub async fn query<'a, I>(
-    client: &InnerClient,
+    client: &mut InnerClient,
     statement: Statement,
     params: I,
 ) -> Result<RowStream, Error>
@@ -59,7 +58,7 @@ where
 }
 
 pub async fn query_txt<S, I>(
-    client: &Arc<InnerClient>,
+    client: &mut InnerClient,
     query: &str,
     params: I,
 ) -> Result<RowStream, Error>
@@ -159,7 +158,7 @@ where
     })
 }
 
-async fn start(client: &InnerClient, buf: Bytes) -> Result<Responses, Error> {
+async fn start(client: &mut InnerClient, buf: Bytes) -> Result<Responses, Error> {
     let mut responses = client.send(RequestMessages::Single(FrontendMessage::Raw(buf)))?;
 
     match responses.next().await? {
@@ -170,7 +169,11 @@ async fn start(client: &InnerClient, buf: Bytes) -> Result<Responses, Error> {
     Ok(responses)
 }
 
-pub fn encode<'a, I>(client: &InnerClient, statement: &Statement, params: I) -> Result<Bytes, Error>
+pub fn encode<'a, I>(
+    client: &mut InnerClient,
+    statement: &Statement,
+    params: I,
+) -> Result<Bytes, Error>
 where
     I: IntoIterator<Item = &'a (dyn ToSql + Sync)>,
     I::IntoIter: ExactSizeIterator,
diff --git a/libs/proxy/tokio-postgres2/src/simple_query.rs b/libs/proxy/tokio-postgres2/src/simple_query.rs
index 2cf17188cf..f4d85d4100 100644
--- a/libs/proxy/tokio-postgres2/src/simple_query.rs
+++ b/libs/proxy/tokio-postgres2/src/simple_query.rs
@@ -33,7 +33,10 @@ impl SimpleColumn {
     }
 }
 
-pub async fn simple_query(client: &InnerClient, query: &str) -> Result<SimpleQueryStream, Error> {
+pub async fn simple_query(
+    client: &mut InnerClient,
+    query: &str,
+) -> Result<SimpleQueryStream, Error> {
     debug!("executing simple query: {}", query);
 
     let buf = encode(client, query)?;
@@ -48,7 +51,7 @@ pub async fn simple_query(client: &InnerClient, query: &str) -> Result<SimpleQue
 }
 
 pub async fn batch_execute(
-    client: &InnerClient,
+    client: &mut InnerClient,
     query: &str,
 ) -> Result<ReadyForQueryStatus, Error> {
     debug!("executing statement batch: {}", query);
@@ -68,7 +71,7 @@ pub async fn batch_execute(
     }
 }
 
-pub(crate) fn encode(client: &InnerClient, query: &str) -> Result<Bytes, Error> {
+pub(crate) fn encode(client: &mut InnerClient, query: &str) -> Result<Bytes, Error> {
     client.with_buf(|buf| {
         frontend::query(query, buf).map_err(Error::encode)?;
         Ok(buf.split().freeze())
diff --git a/libs/proxy/tokio-postgres2/src/transaction.rs b/libs/proxy/tokio-postgres2/src/transaction.rs
index f32603470f..ecb35cf60f 100644
--- a/libs/proxy/tokio-postgres2/src/transaction.rs
+++ b/libs/proxy/tokio-postgres2/src/transaction.rs
@@ -54,7 +54,11 @@ impl<'a> Transaction<'a> {
     }
 
     /// Like `Client::query_raw_txt`.
-    pub async fn query_raw_txt<S, I>(&self, statement: &str, params: I) -> Result<RowStream, Error>
+    pub async fn query_raw_txt<S, I>(
+        &mut self,
+        statement: &str,
+        params: I,
+    ) -> Result<RowStream, Error>
     where
         S: AsRef<str>,
         I: IntoIterator<Item = Option<S>>,