diff --git a/extensions/markdown-language-features/notebook/tsconfig.json b/extensions/markdown-language-features/notebook/tsconfig.json
index 62428196e58..426411ea857 100644
--- a/extensions/markdown-language-features/notebook/tsconfig.json
+++ b/extensions/markdown-language-features/notebook/tsconfig.json
@@ -7,7 +7,7 @@
 		"allowSyntheticDefaultImports": true,
 		"module": "es2020",
 		"lib": [
-			"es2024",
+			"ES2024",
 			"DOM",
 			"DOM.Iterable"
 		]
diff --git a/extensions/markdown-math/notebook/tsconfig.json b/extensions/markdown-math/notebook/tsconfig.json
index 9a021344e66..ae9e837683c 100644
--- a/extensions/markdown-math/notebook/tsconfig.json
+++ b/extensions/markdown-math/notebook/tsconfig.json
@@ -5,7 +5,7 @@
 		"jsx": "react",
 		"module": "es2020",
 		"lib": [
-			"es2024",
+			"ES2024",
 			"DOM",
 			"DOM.Iterable"
 		]
diff --git a/extensions/simple-browser/preview-src/tsconfig.json b/extensions/simple-browser/preview-src/tsconfig.json
index 0e8d83c7baf..72282fb0c7d 100644
--- a/extensions/simple-browser/preview-src/tsconfig.json
+++ b/extensions/simple-browser/preview-src/tsconfig.json
@@ -4,7 +4,7 @@
 		"outDir": "./dist/",
 		"jsx": "react",
 		"lib": [
-			"es2024",
+			"ES2024",
 			"DOM",
 			"DOM.Iterable"
 		]
diff --git a/extensions/tsconfig.base.json b/extensions/tsconfig.base.json
index ff5974b844b..9d939dd568a 100644
--- a/extensions/tsconfig.base.json
+++ b/extensions/tsconfig.base.json
@@ -1,7 +1,7 @@
 {
 	"compilerOptions": {
 		"esModuleInterop": true,
-		"target": "es2024",
+		"target": "ES2024",
 		"lib": [
 			"ES2024"
 		],