diff --git a/Sources/Core/Domain/Marketplace.swift b/Sources/Core/Domain/Marketplace.swift
index b4f929e..52d1b6f 100644
--- a/Sources/Core/Domain/Marketplace.swift
+++ b/Sources/Core/Domain/Marketplace.swift
@@ -37,7 +37,11 @@ struct PublicDeckOwner: Codable, Hashable, Sendable {
     let displayName: String
     let verifiedMana: Bool
     let verifiedCommunity: Bool
-    let pseudonym: String?
+    /// Flag: Autor tritt pseudonym auf (Anzeigename verbergen).
+    /// Server-Schema ist `boolean NOT NULL DEFAULT false`. War in v0.8.x
+    /// fälschlich als `String?` (Anzeige-Pseudonym) interpretiert —
+    /// führte zu Decoder-typeMismatch beim Öffnen eines Marketplace-Decks.
+    let pseudonym: Bool
 
     enum CodingKeys: String, CodingKey {
         case slug
@@ -53,7 +57,7 @@ struct PublicDeckOwner: Codable, Hashable, Sendable {
         displayName = try c.decode(String.self, forKey: .displayName)
         verifiedMana = try c.decode(Bool.self, forKey: .verifiedMana)
         verifiedCommunity = try c.decode(Bool.self, forKey: .verifiedCommunity)
-        pseudonym = try c.decodeIfPresent(String.self, forKey: .pseudonym)
+        pseudonym = (try? c.decode(Bool.self, forKey: .pseudonym)) ?? false
     }
 }
 
diff --git a/Tests/UnitTests/MarketplaceDecodingTests.swift b/Tests/UnitTests/MarketplaceDecodingTests.swift
index c1d7a80..c86904c 100644
--- a/Tests/UnitTests/MarketplaceDecodingTests.swift
+++ b/Tests/UnitTests/MarketplaceDecodingTests.swift
@@ -31,7 +31,7 @@ struct MarketplaceDecodingTests {
                 "display_name": "mana-Kuratoren",
                 "verified_mana": true,
                 "verified_community": false,
-                "pseudonym": null
+                "pseudonym": false
             }
         }
         """.data(using: .utf8)!
diff --git a/project.yml b/project.yml
index 2a39639..43a5fe4 100644
--- a/project.yml
+++ b/project.yml
@@ -55,7 +55,7 @@ targets:
       path: Sources/Resources/Info.plist
       properties:
         CFBundleShortVersionString: "0.1.0"
-        CFBundleVersion: "3"
+        CFBundleVersion: "4"
         CFBundleDevelopmentRegion: de
         CFBundleDisplayName: Cardecky
         LSApplicationCategoryType: "public.app-category.education"
@@ -111,7 +111,7 @@ targets:
       properties:
         CFBundleDisplayName: Als Karte speichern
         CFBundleShortVersionString: "0.1.0"
-        CFBundleVersion: "3"
+        CFBundleVersion: "4"
         NSExtension:
           NSExtensionPointIdentifier: com.apple.share-services
           NSExtensionPrincipalClass: $(PRODUCT_MODULE_NAME).ShareViewController
@@ -144,7 +144,7 @@ targets:
       properties:
         CFBundleDisplayName: Cardecky Widget
         CFBundleShortVersionString: "0.1.0"
-        CFBundleVersion: "3"
+        CFBundleVersion: "4"
         NSExtension:
           NSExtensionPointIdentifier: com.apple.widgetkit-extension
     entitlements: