diff --git a/CHANGES.md b/CHANGES.md
index ece87f3c..fa478e35 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,5 +1,6 @@
 ## Version 1.20
 
+- Update to Salesforce API v 59.0 (Winter '24)
 - Add a parameter to activate summary view of pset / psetGroup from shortcut tab [feature 175](https://github.com/tprouvot/Salesforce-Inspector-reloaded/issues/175)
 - Display record name (and link) in popup [feature 165](https://github.com/tprouvot/Salesforce-Inspector-reloaded/issues/165)
 - Add documentation link to popup
diff --git a/addon/inspector.js b/addon/inspector.js
index 7c002695..96fc5003 100644
--- a/addon/inspector.js
+++ b/addon/inspector.js
@@ -1,10 +1,10 @@
-export let apiVersion = localStorage.getItem("apiVersion") == null ? "57.0" : localStorage.getItem("apiVersion");
+export let apiVersion = localStorage.getItem("apiVersion") == null ? "59.0" : localStorage.getItem("apiVersion");
 export let sfConn = {
 
   async getSession(sfHost) {
     let paramKey = "access_token";
     let message = await new Promise(resolve =>
-      chrome.runtime.sendMessage({ message: "getSession", sfHost }, resolve));
+      chrome.runtime.sendMessage({message: "getSession", sfHost}, resolve));
     if (message) {
       this.instanceHostname = message.hostname;
       this.sessionId = message.key;
@@ -31,7 +31,7 @@ export let sfConn = {
     }
   },
 
-  async rest(url, { logErrors = true, method = "GET", api = "normal", body = undefined, bodyType = "json", headers = {}, progressHandler = null } = {}) {
+  async rest(url, {logErrors = true, method = "GET", api = "normal", body = undefined, bodyType = "json", headers = {}, progressHandler = null} = {}) {
     if (!this.instanceHostname || !this.sessionId) {
       throw new Error("Session not found");
     }
@@ -137,7 +137,7 @@ export let sfConn = {
     return wsdl;
   },
 
-  async soap(wsdl, method, args, { headers } = {}) {
+  async soap(wsdl, method, args, {headers} = {}) {
     if (!this.instanceHostname || !this.sessionId) {
       throw new Error("Session not found");
     }
@@ -147,13 +147,13 @@ export let sfConn = {
     xhr.setRequestHeader("Content-Type", "text/xml");
     xhr.setRequestHeader("SOAPAction", '""');
 
-    let sessionHeader = { SessionHeader: { sessionId: this.sessionId } };
+    let sessionHeader = {SessionHeader: {sessionId: this.sessionId}};
     let requestBody = XML.stringify({
       name: "soapenv:Envelope",
       attributes: ` xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"${wsdl.targetNamespaces}`,
       value: {
         "soapenv:Header": Object.assign({}, sessionHeader, headers),
-        "soapenv:Body": { [method]: args }
+        "soapenv:Body": {[method]: args}
       }
     });
 
@@ -193,7 +193,7 @@ export let sfConn = {
 };
 
 class XML {
-  static stringify({ name, attributes, value }) {
+  static stringify({name, attributes, value}) {
     function buildRequest(el, params) {
       if (params == null) {
         el.setAttribute("xsi:nil", "true");
diff --git a/sfdx-project.json b/sfdx-project.json
index a6ae1cfc..5dd1c75d 100644
--- a/sfdx-project.json
+++ b/sfdx-project.json
@@ -7,5 +7,5 @@
 	],
 	"namespace": "",
 	"sfdcLoginUrl": "https://login.salesforce.com",
-	"sourceApiVersion": "58.0"
-}
\ No newline at end of file
+	"sourceApiVersion": "59.0"
+}