diff --git a/.changeset/olive-rice-sell.md b/.changeset/olive-rice-sell.md
new file mode 100644
index 00000000000..42f36e9a8f3
--- /dev/null
+++ b/.changeset/olive-rice-sell.md
@@ -0,0 +1,5 @@
+---
+'@graphiql/react': patch
+---
+
+Prefer KeyboardEvent#key over KeyboardEvent#keyCode
diff --git a/.eslintrc.js b/.eslintrc.js
index c0a781d7f4c..80f0baf3fc4 100644
--- a/.eslintrc.js
+++ b/.eslintrc.js
@@ -198,6 +198,11 @@ module.exports = {
         message:
           "`useMemo` with an empty dependency array can't provide a stable reference, use `useRef` instead.",
       },
+      {
+        // ❌ event.keyCode
+        selector: 'MemberExpression > .property[type=Identifier][name=keyCode]',
+        message: 'Use `.key` instead of `.keyCode`',
+      },
     ],
     'no-ternary': 0,
     'no-underscore-dangle': 0,
@@ -282,6 +287,8 @@ module.exports = {
     'unicorn/prefer-node-protocol': 'error',
     'import/no-unresolved': ['error', { ignore: ['^node:'] }],
     'unicorn/prefer-string-replace-all': 'error',
+    // doesn't catch a lot of cases; we use ESLint builtin `no-restricted-syntax` to forbid `.keyCode`
+    'unicorn/prefer-keyboard-event-key': 'off',
 
     'unicorn/prefer-switch': 'error',
     // TODO: Fix all errors for the following rules included in recommended config
diff --git a/packages/graphiql-react/src/editor/header-editor.ts b/packages/graphiql-react/src/editor/header-editor.ts
index 83a05e3dfc9..19e8727c316 100644
--- a/packages/graphiql-react/src/editor/header-editor.ts
+++ b/packages/graphiql-react/src/editor/header-editor.ts
@@ -96,13 +96,10 @@ export function useHeaderEditor(
       });
 
       newEditor.on('keyup', (editorInstance, event) => {
-        const code = event.keyCode;
-        if (
-          (code >= 65 && code <= 90) || // letters
-          (!event.shiftKey && code >= 48 && code <= 57) || // numbers
-          (event.shiftKey && code === 189) || // underscore
-          (event.shiftKey && code === 222) // "
-        ) {
+        const { keyCode, key, shiftKey } = event;
+        const isLetter = keyCode >= 65 && keyCode <= 90;
+        const isNumber = keyCode >= 48 && keyCode <= 57;
+        if (isLetter || (!shiftKey && isNumber) || key === '_' || key === '"') {
           editorInstance.execCommand('autocomplete');
         }
       });
diff --git a/packages/graphiql-react/src/editor/variable-editor.ts b/packages/graphiql-react/src/editor/variable-editor.ts
index 96e50d9ee6d..d3c54ac995b 100644
--- a/packages/graphiql-react/src/editor/variable-editor.ts
+++ b/packages/graphiql-react/src/editor/variable-editor.ts
@@ -116,13 +116,10 @@ export function useVariableEditor(
       });
 
       newEditor.on('keyup', (editorInstance, event) => {
-        const code = event.keyCode;
-        if (
-          (code >= 65 && code <= 90) || // letters
-          (!event.shiftKey && code >= 48 && code <= 57) || // numbers
-          (event.shiftKey && code === 189) || // underscore
-          (event.shiftKey && code === 222) // "
-        ) {
+        const { keyCode, key, shiftKey } = event;
+        const isLetter = keyCode >= 65 && keyCode <= 90;
+        const isNumber = keyCode >= 48 && keyCode <= 57;
+        if (isLetter || (!shiftKey && isNumber) || key === '_' || key === '"') {
           editorInstance.execCommand('autocomplete');
         }
       });
diff --git a/packages/graphiql-react/src/explorer/components/search.tsx b/packages/graphiql-react/src/explorer/components/search.tsx
index c4258d86b30..886899d7b89 100644
--- a/packages/graphiql-react/src/explorer/components/search.tsx
+++ b/packages/graphiql-react/src/explorer/components/search.tsx
@@ -50,10 +50,11 @@ export function Search() {
 
   useEffect(() => {
     function handleKeyDown(event: KeyboardEvent) {
-      if (event.metaKey && event.keyCode === 75 && inputRef.current) {
-        inputRef.current.focus();
+      if (event.metaKey && event.key === 'k') {
+        inputRef.current?.focus();
       }
     }
+
     window.addEventListener('keydown', handleKeyDown);
     return () => window.removeEventListener('keydown', handleKeyDown);
   }, []);
diff --git a/packages/graphiql-react/src/history/components.tsx b/packages/graphiql-react/src/history/components.tsx
index b5ad56b52a8..3ca42552d85 100644
--- a/packages/graphiql-react/src/history/components.tsx
+++ b/packages/graphiql-react/src/history/components.tsx
@@ -75,11 +75,9 @@ export function HistoryItem(props: QueryHistoryItemProps) {
             defaultValue={props.item.label}
             ref={inputRef}
             onKeyDown={e => {
-              if (e.keyCode === 27) {
-                // Escape
+              if (e.key === 'Esc') {
                 setIsEditable(false);
-              } else if (e.keyCode === 13) {
-                // Enter
+              } else if (e.key === 'Enter') {
                 setIsEditable(false);
                 editLabel({ ...props.item, label: e.currentTarget.value });
               }
diff --git a/packages/graphiql-react/src/schema.tsx b/packages/graphiql-react/src/schema.tsx
index 8fa7fc04176..6284fc95ddc 100644
--- a/packages/graphiql-react/src/schema.tsx
+++ b/packages/graphiql-react/src/schema.tsx
@@ -194,6 +194,7 @@ export function SchemaContextProvider(props: SchemaContextProviderProps) {
     const counter = ++counterRef.current;
 
     const maybeIntrospectionData = props.schema;
+
     async function fetchIntrospectionData() {
       if (maybeIntrospectionData) {
         // No need to introspect if we already have the data
@@ -317,10 +318,11 @@ export function SchemaContextProvider(props: SchemaContextProviderProps) {
    */
   useEffect(() => {
     function triggerIntrospection(event: KeyboardEvent) {
-      if (event.keyCode === 82 && event.shiftKey && event.ctrlKey) {
+      if (event.ctrlKey && event.key === 'R') {
         introspect();
       }
     }
+
     window.addEventListener('keydown', triggerIntrospection);
     return () => window.removeEventListener('keydown', triggerIntrospection);
   });