diff --git a/features.json b/features.json
index d8694913..71723404 100644
--- a/features.json
+++ b/features.json
@@ -41,7 +41,7 @@
 			"phase": 4
 		},
 		"mutableGlobals": {
-			"description": "Import & export of mutable globals",
+			"description": "Mutable globals",
 			"url": "https://github.com/WebAssembly/mutable-global/blob/master/proposals/mutable-global/Overview.md",
 			"phase": 4
 		},
@@ -94,8 +94,8 @@
 				"bigInt": "85",
 				"bulkMemory": "75",
 				"exceptions": "95",
-				"extendedConst": ["flag", "Requires flag `--js-flags=--experimental-wasm-extended-const`"],
-				"memory64": ["flag", "Requires flag `--js-flags=--experimental-wasm-memory64`"],
+				"extendedConst": ["flag", "Requires corresponding v8 flag (`--js-flags=\"...\"`)"],
+				"memory64": ["flag", "Requires corresponding v8 flag (`--js-flags=\"...\"`)"],
 				"multiValue": "85",
 				"mutableGlobals": "74",
 				"relaxedSimd": ["flag", "Requires flag `--js-flags=--experimental-wasm-relaxed-simd`"],
@@ -148,16 +148,16 @@
 			"version": "0.33",
 			"features": {
 				"bigInt": null,
-				"bulkMemory": true,
-				"memory64": ["flag", "Requires flag `--enable-memory64`"],
-				"multiMemory": ["flag", "Requires flag `--enable-multi-memory`"],
-				"moduleLinking": ["flag", "Requires flag `--enable-module-linking`"],
-				"multiValue": true,
+				"bulkMemory": "0.20",
+				"memory64": ["flag", "Requires flag `--wasm-features=...`"],
+				"multiMemory": ["flag", "Requires flag `--wasm-features=...`"],
+				"multiValue": "0.17",
 				"mutableGlobals": true,
-				"referenceTypes": true,
+				"referenceTypes": "0.20",
 				"saturatedFloatToInt": true,
 				"signExtensions": true,
-				"simd": true
+				"simd": "0.33",
+				"threads": ["flag", "Requires flag `--wasm-features=...`"]
 			}
 		},
 		"Wasmer": {
@@ -165,13 +165,13 @@
 			"logo": "/images/wasmer.svg",
 			"features": {
 				"bigInt": null,
-				"bulkMemory": true,
-				"multiValue": true,
-				"mutableGlobals": true,
-				"referenceTypes": true,
+				"bulkMemory": "1.0",
+				"multiValue": "1.0",
+				"mutableGlobals": "0.7",
+				"referenceTypes": "2.0",
 				"saturatedFloatToInt": true,
 				"signExtensions": true,
-				"simd": true,
+				"simd": "2.0",
 				"threads": ["flag", "Requires flag `--enable-threads`"]
 			}
 		},
@@ -180,17 +180,20 @@
 			"logo": "/images/nodejs.svg",
 			"features": {
 				"bigInt": true,
-				"bulkMemory": true,
-				"exceptions": ["flag", "Requires flag `--experimental-wasm-eh`"],
-				"extendedConst": ["flag", "Requires flag `--experimental-wasm-extended-const`"],
-				"multiValue": true,
-				"mutableGlobals": true,
-				"referenceTypes": ["flag", "Requires flag `--experimental-wasm-reftypes`"],
-				"saturatedFloatToInt": true,
-				"signExtensions": true,
-				"simd": true,
-				"tailCall": ["flag", "Requires flag `--experimental-wasm-return-call`"],
-				"threads": true
+				"bulkMemory": "12.5",
+				"exceptions": "17.0",
+				"extendedConst": ["flag", "Requires corresponding v8 flag"],
+				"memory64": ["flag", "Requires corresponding v8 flag"],
+				"multiValue": "15.0",
+				"mutableGlobals": "12.0",
+				"referenceTypes": "17.2",
+				"relaxedSimd": ["flag", "Requires corresponding v8 flag"],
+				"saturatedFloatToInt": "12.5",
+				"signExtensions": "12.0",
+				"simd": "16.4",
+				"tailCall": ["flag", "Requires corresponding v8 flag"],
+				"threads": "16.4",
+				"typeReflection": ["flag", "Requires corresponding v8 flag"]
 			}
 		},
 		"Deno": {
@@ -198,16 +201,20 @@
 			"logo": "/images/deno.svg",
 			"features": {
 				"bigInt": true,
-				"bulkMemory": true,
-				"exceptions": true,
-				"multiValue": true,
-				"mutableGlobals": true,
-				"referenceTypes": true,
-				"saturatedFloatToInt": true,
-				"signExtensions": true,
-				"simd": true,
-				"tailCall": false,
-				"threads": true
+				"bulkMemory": "0.4",
+				"exceptions": "1.16",
+				"extendedConst": ["flag", "Requires corresponding v8 flag (`--v8-flags=\"...\"`)"],
+				"memory64": ["flag", "Requires corresponding v8 flag (`--v8-flags=\"...\"`)"],
+				"multiValue": "1.3.2",
+				"mutableGlobals": "0.1",
+				"referenceTypes": "1.16",
+				"relaxedSimd": ["flag", "Requires corresponding v8 flag (`--v8-flags=\"...\"`)"],
+				"saturatedFloatToInt": "0.4",
+				"signExtensions": "0.1",
+				"simd": "1.9",
+				"tailCall": ["flag", "Requires corresponding v8 flag (`--v8-flags=\"...\"`)"],
+				"threads": "1.9",
+				"typeReflection": ["flag", "Requires corresponding v8 flag (`--v8-flags=\"...\"`)"]
 			}
 		},
 		"wasm2c": {