diff --git a/.changeset/weak-clocks-switch.md b/.changeset/weak-clocks-switch.md
new file mode 100644
index 00000000..74afdf1c
--- /dev/null
+++ b/.changeset/weak-clocks-switch.md
@@ -0,0 +1,6 @@
+---
+"@clack/prompts": patch
+"@clack/core": patch
+---
+
+Fixed spaces and uppercase characters in multiline prompt
diff --git a/packages/core/src/prompts/multi-line.ts b/packages/core/src/prompts/multi-line.ts
index d3765fc1..dcec90af 100644
--- a/packages/core/src/prompts/multi-line.ts
+++ b/packages/core/src/prompts/multi-line.ts
@@ -1,9 +1,11 @@
 import type { Key } from 'node:readline';
 import { styleText } from 'node:util';
 import { findTextCursor } from '../utils/cursor.js';
-import { type Action, settings } from '../utils/index.js';
 import Prompt, { type PromptOptions } from './prompt.js';
 
+type CursorAction = 'up' | 'down' | 'left' | 'right';
+const cursorActions = new Set<CursorAction>(['up', 'down', 'left', 'right']);
+
 export interface MultiLineOptions extends PromptOptions<string, MultiLinePrompt> {
 	placeholder?: string;
 	defaultValue?: string;
@@ -41,7 +43,7 @@ export default class MultiLinePrompt extends Prompt<string> {
 			this.userInput.slice(0, this.cursor) + char + this.userInput.slice(this.cursor)
 		);
 	}
-	#handleCursor(key?: Action) {
+	#handleCursor(key?: CursorAction) {
 		const text = this.value ?? '';
 		switch (key) {
 			case 'up':
@@ -89,8 +91,8 @@ export default class MultiLinePrompt extends Prompt<string> {
 		this.#showSubmit = opts.showSubmit ?? false;
 
 		this.on('key', (char, key) => {
-			if (key?.name && settings.actions.has(key.name as Action)) {
-				this.#handleCursor(key.name as Action);
+			if (key?.name && cursorActions.has(key.name as CursorAction)) {
+				this.#handleCursor(key.name as CursorAction);
 				return;
 			}
 			if (char === '\t' && this.#showSubmit) {
diff --git a/packages/core/src/prompts/multi-select.ts b/packages/core/src/prompts/multi-select.ts
index a19817a5..f5b04254 100644
--- a/packages/core/src/prompts/multi-select.ts
+++ b/packages/core/src/prompts/multi-select.ts
@@ -60,11 +60,11 @@ export default class MultiSelectPrompt<T extends OptionLike> extends Prompt<T['v
 			0
 		);
 		this.cursor = this.options[cursor].disabled ? findCursor<T>(cursor, 1, this.options) : cursor;
-		this.on('key', (char) => {
-			if (char === 'a') {
+		this.on('key', (_char, key) => {
+			if (key.name === 'a') {
 				this.toggleAll();
 			}
-			if (char === 'i') {
+			if (key.name === 'i') {
 				this.toggleInvert();
 			}
 		});
diff --git a/packages/core/src/prompts/prompt.ts b/packages/core/src/prompts/prompt.ts
index 4333da9d..c48a5181 100644
--- a/packages/core/src/prompts/prompt.ts
+++ b/packages/core/src/prompts/prompt.ts
@@ -226,7 +226,7 @@ export default class Prompt<TValue> {
 		}
 
 		// Call the key event handler and emit the key event
-		this.emit('key', char?.toLowerCase(), key);
+		this.emit('key', char, key);
 
 		if (key?.name === 'return' && this._shouldSubmit(char, key)) {
 			if (this.opts.validate) {
diff --git a/packages/core/src/prompts/select-key.ts b/packages/core/src/prompts/select-key.ts
index 2e8e0b10..04a49a52 100644
--- a/packages/core/src/prompts/select-key.ts
+++ b/packages/core/src/prompts/select-key.ts
@@ -19,17 +19,17 @@ export default class SelectKeyPrompt<T extends { value: string }> extends Prompt
 		});
 		this.cursor = Math.max(keys.indexOf(opts.initialValue), 0);
 
-		this.on('key', (key, keyInfo) => {
+		this.on('key', (key) => {
 			if (!key) {
 				return;
 			}
-			const casedKey = caseSensitive && keyInfo.shift ? key.toUpperCase() : key;
+			const casedKey = caseSensitive ? key : key.toLowerCase();
 			if (!keys.includes(casedKey)) {
 				return;
 			}
 
 			const value = this.options.find(({ value: [initial] }) => {
-				return caseSensitive ? initial === casedKey : initial?.toLowerCase() === key;
+				return caseSensitive ? initial === casedKey : initial?.toLowerCase() === casedKey;
 			});
 			if (value) {
 				this.value = value.value;
diff --git a/packages/core/test/prompts/multi-line.test.ts b/packages/core/test/prompts/multi-line.test.ts
index 53f86a5d..2b92f804 100644
--- a/packages/core/test/prompts/multi-line.test.ts
+++ b/packages/core/test/prompts/multi-line.test.ts
@@ -175,6 +175,30 @@ describe('MultiLinePrompt', () => {
 			expect(result).to.equal('xy');
 		});
 
+		test('space inserts space', () => {
+			const instance = new MultiLinePrompt({
+				input,
+				output,
+				render: () => 'foo',
+			});
+			instance.prompt();
+			input.emit('keypress', 'x', { name: 'x' });
+			input.emit('keypress', ' ', { name: 'space' });
+			expect(instance.userInput).to.equal('x ');
+		});
+
+		test('shift modifier inserts uppercase characters', () => {
+			const instance = new MultiLinePrompt({
+				input,
+				output,
+				render: () => 'foo',
+			});
+			instance.prompt();
+			input.emit('keypress', 'x', { name: 'x' });
+			input.emit('keypress', 'X', { name: 'x', shift: true });
+			expect(instance.userInput).to.equal('xX');
+		});
+
 		test('backspace deletes previous char', async () => {
 			const instance = new MultiLinePrompt({
 				input,
diff --git a/packages/prompts/test/select-key.test.ts b/packages/prompts/test/select-key.test.ts
index 2e143a88..856afde8 100644
--- a/packages/prompts/test/select-key.test.ts
+++ b/packages/prompts/test/select-key.test.ts
@@ -114,7 +114,7 @@ describe.each(['true', 'false'])('text (isCI = %s)', (isCI) => {
 			output,
 		});
 
-		input.emit('keypress', 'a', { name: 'a', shift: true });
+		input.emit('keypress', 'A', { name: 'a', shift: true });
 
 		const value = await result;
 
@@ -156,7 +156,7 @@ describe.each(['true', 'false'])('text (isCI = %s)', (isCI) => {
 			output,
 		});
 
-		input.emit('keypress', 'a', { name: 'a', shift: true });
+		input.emit('keypress', 'A', { name: 'a', shift: true });
 
 		const value = await result;