diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 972693f..df2fdb7 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -11,22 +11,27 @@ jobs:
     name: Swift ${{ matrix.swift }} on Ubuntu
     runs-on: ubuntu-latest
     strategy:
+      fail-fast: false
       matrix:
-        swift: ["5.9", "5.10"]
+        swift: ["5.9", "5.10", "6.0", "6.1", "6.2", "6.3", "6.4"]
     container:
       image: swift:${{ matrix.swift }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
       - name: Build
         run: swift build
       - name: Test
         run: swift test
 
   test-macos:
-    name: Swift on macOS
-    runs-on: macos-14
+    name: Swift on ${{ matrix.os }}
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [macos-15, macos-26]
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v7
       - name: Build
         run: swift build
       - name: Test
diff --git a/README.md b/README.md
index 9d6bbce..5c8fc52 100644
--- a/README.md
+++ b/README.md
@@ -195,6 +195,7 @@ The primary response type for IP lookups.
 | `city` | `String?` | City name |
 | `region` | `String?` | Region / state |
 | `regionCode` | `String?` | Region code |
+| `regionType` | `String?` | Kind of region (for example `state` or `province`) |
 | `countryName` | `String?` | Country name |
 | `countryCode` | `String?` | ISO 3166-1 alpha-2 code |
 | `continentName` | `String?` | Continent name |
@@ -205,12 +206,13 @@ The primary response type for IP lookups.
 | `callingCode` | `String?` | International calling code |
 | `flag` | `String?` | Flag image URL |
 | `emojiFlag` | `String?` | Flag emoji |
+| `emojiUnicode` | `String?` | Flag emoji as Unicode code points (for example `U+1F1FA U+1F1F8`) |
 | `asn` | `ASN?` | Autonomous system info |
 | `company` | `Company?` | Organization that owns the IP |
 | `carrier` | `Carrier?` | Mobile carrier info |
 | `languages` | `[Language]?` | Languages spoken in the country |
 | `currency` | `Currency?` | Local currency |
-| `timeZone` | `TimeZone?` | Time zone details |
+| `timeZone` | `TimeZoneInfo?` | Time zone details |
 | `threat` | `Threat?` | Threat intelligence data |
 | `count` | `Int?` | API requests in last 24 hours |
 
@@ -218,6 +220,10 @@ The primary response type for IP lookups.
 
 Detailed ASN data from the dedicated `/asn` endpoint. Includes `ipv4Prefixes`, `ipv6Prefixes`, `numIPs`, `upstream`, `downstream`, and `peers`.
 
+### TimeZoneInfo
+
+Time zone of the IP address location: `name`, `abbr`, `offset`, `isDST` and `currentTime`. The type is called `TimeZoneInfo` so that it does not shadow Foundation's `TimeZone`.
+
 ### Threat
 
 Threat intelligence flags: `isTor`, `isVPN`, `isICloudRelay`, `isProxy`, `isDatacenter`, `isAnonymous`, `isKnownAttacker`, `isKnownAbuser`, `isThreat`, `isBogon`. Includes `blocklists` and reputation `scores` (0-100 for VPN, proxy, threat, and trust).
diff --git a/Sources/IPData/IPDataClient.swift b/Sources/IPData/IPDataClient.swift
index 5963b00..f86b750 100644
--- a/Sources/IPData/IPDataClient.swift
+++ b/Sources/IPData/IPDataClient.swift
@@ -134,11 +134,9 @@ public final class IPDataClient: @unchecked Sendable {
     ///   - fields: Optional list of fields to return.
     /// - Returns: An array of ``IPResponse`` results, one per IP.
     public func bulkLookup(_ ips: [String], fields: [String]? = nil) async throws -> [IPResponse] {
-        var url = buildURL(path: "/bulk", fields: fields)
-        // For bulk, the api-key must be a query parameter
-        if !url.absoluteString.contains("api-key") {
-            url = appendAPIKey(to: url)
-        }
+        // For bulk, the api-key must be a query parameter; `buildURL` adds it to
+        // every URL, so nothing else is needed here.
+        let url = buildURL(path: "/bulk", fields: fields)
 
         var request = URLRequest(url: url)
         request.httpMethod = "POST"
@@ -177,14 +175,6 @@ public final class IPDataClient: @unchecked Sendable {
         return components.url!
     }
 
-    private func appendAPIKey(to url: URL) -> URL {
-        var components = URLComponents(url: url, resolvingAgainstBaseURL: false)!
-        var items = components.queryItems ?? []
-        items.append(URLQueryItem(name: "api-key", value: apiKey))
-        components.queryItems = items
-        return components.url!
-    }
-
     private func fetch<T: Decodable>(_ url: URL) async throws -> T {
         var request = URLRequest(url: url)
         request.setValue(apiKey, forHTTPHeaderField: "api-key")
@@ -254,7 +244,11 @@ public final class IPDataClient: @unchecked Sendable {
 
 // MARK: - Linux Async Compatibility
 
-#if canImport(FoundationNetworking)
+// swift-corelibs-foundation ships the async `URLSession.data(for:delegate:)` from
+// Swift 6.0 on; the 5.9 and 5.10 toolchains on Linux lack it and use this shim instead.
+// It is compiled only for those toolchains so that it never sits next to the native
+// method.
+#if canImport(FoundationNetworking) && compiler(<6.0)
 extension URLSession {
     func data(for request: URLRequest) async throws -> (Data, URLResponse) {
         try await withCheckedThrowingContinuation { continuation in
diff --git a/Tests/IPDataTests/IPDataClientTests.swift b/Tests/IPDataTests/IPDataClientTests.swift
index 2cdf3a5..7684bae 100644
--- a/Tests/IPDataTests/IPDataClientTests.swift
+++ b/Tests/IPDataTests/IPDataClientTests.swift
@@ -222,6 +222,21 @@ final class IPDataClientTests: XCTestCase {
         XCTAssertEqual(results[1].ip, "8.8.8.8")
     }
 
+    func testBulkLookupSendsTheAPIKeyOnceAsAQueryItem() async throws {
+        MockURLProtocol.requestHandler = { request in
+            let components = URLComponents(url: request.url!, resolvingAgainstBaseURL: false)!
+            let items = components.queryItems ?? []
+            let apiKeyItems = items.filter { $0.name == "api-key" }
+            XCTAssertEqual(apiKeyItems.count, 1, "Query: \(components.query ?? "")")
+            XCTAssertEqual(apiKeyItems.first?.value, "test-api-key")
+            XCTAssertTrue(items.contains(where: { $0.name == "fields" && $0.value == "ip" }))
+            return okResponse(for: request, json: #"[{"ip": "1.1.1.1"}]"#)
+        }
+
+        _ = try await client.bulkLookup(["1.1.1.1"], fields: ["ip"])
+        XCTAssertEqual(MockURLProtocol.requestCount, 1)
+    }
+
     // MARK: - Connection Reuse
 
     func testConsecutiveRequestsGoThroughTheSameInjectedSession() async throws {