diff --git a/src/message/http/index.ts b/src/message/http/index.ts
index 029965e..3712fa4 100644
--- a/src/message/http/index.ts
+++ b/src/message/http/index.ts
@@ -87,11 +87,8 @@ export function isEvent(message: Message): boolean {
 export function deserialize(message: Message): CloudEvent {
   const cleanHeaders: Headers = sanitize(message.headers);
   const mode: Mode = getMode(cleanHeaders);
-  let version = getVersion(mode, cleanHeaders, message.body);
-  if (version !== Version.V03 && version !== Version.V1) {
-    console.error(`Unknown spec version ${version}. Default to ${Version.V1}`);
-    version = Version.V1;
-  }
+  const version = getVersion(mode, cleanHeaders, message.body);
+
   switch (mode) {
     case Mode.BINARY:
       return parseBinary(message, version);
@@ -160,7 +157,7 @@ function parseBinary(message: Message, version: Version): CloudEvent {
   const sanitizedHeaders = sanitize(headers);
 
   const eventObj: { [key: string]: unknown | string | Record<string, unknown> } = {};
-  const parserMap: Record<string, MappedParser> = version === Version.V1 ? v1binaryParsers : v03binaryParsers;
+  const parserMap: Record<string, MappedParser> = version === Version.V03 ? v03binaryParsers : v1binaryParsers;
 
   for (const header in parserMap) {
     if (sanitizedHeaders[header]) {
@@ -218,13 +215,13 @@ function parseStructured(message: Message, version: Version): CloudEvent {
   const incoming = { ...(parser.parse(payload as string) as Record<string, unknown>) };
 
   const eventObj: { [key: string]: unknown } = {};
-  const parserMap: Record<string, MappedParser> = version === Version.V1 ? v1structuredParsers : v03structuredParsers;
+  const parserMap: Record<string, MappedParser> = version === Version.V03 ? v03structuredParsers : v1structuredParsers;
 
   for (const key in parserMap) {
     const property = incoming[key];
     if (property) {
-      const parser: MappedParser = parserMap[key];
-      eventObj[parser.name] = parser.parser.parse(property as string);
+      const mappedParser: MappedParser = parserMap[key];
+      eventObj[mappedParser.name] = mappedParser.parser.parse(property as string);
     }
     delete incoming[key];
   }
diff --git a/test/integration/message_test.ts b/test/integration/message_test.ts
index 893686b..5246aca 100644
--- a/test/integration/message_test.ts
+++ b/test/integration/message_test.ts
@@ -96,7 +96,9 @@ describe("HTTP transport", () => {
       },
     };
     expect(HTTP.isEvent(message)).to.be.true;
-    expect(HTTP.toEvent(message)).not.to.throw;
+    const event: CloudEvent = HTTP.toEvent(message);
+    expect(event.specversion).to.equal("11.8");
+    expect(event.validate()).to.be.false;
   });
 
   it("Can detect CloudEvent structured Messages with weird versions", () => {