diff --git a/.appveyor.yml b/.appveyor.yml
index f0cf267..9caa43e 100644
--- a/.appveyor.yml
+++ b/.appveyor.yml
@@ -23,36 +23,6 @@ environment:
       GENERATOR_ARCH: x64
       PYTHON: "C:\\Python38-x64"
       CXX_STANDARD: 11
-    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
-      BUILD_TYPE: Debug
-      GENERATOR_ARCH: Win32
-      PYTHON: "C:\\Python38"
-      CXX_STANDARD: 11
-    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
-      BUILD_TYPE: Debug
-      GENERATOR_ARCH: x64
-      PYTHON: "C:\\Python38-x64"
-      CXX_STANDARD: 11
-    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
-      BUILD_TYPE: Debug
-      GENERATOR_ARCH: x64
-      PYTHON: "C:\\Python38-x64"
-      CXX_STANDARD: 14
-    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
-      BUILD_TYPE: Debug
-      GENERATOR_ARCH: x64
-      PYTHON: "C:\\Python38-x64"
-      CXX_STANDARD: 17
-    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
-      BUILD_TYPE: Debug
-      GENERATOR_ARCH: x64
-      PYTHON: "C:\\Python38-x64"
-      CXX_STANDARD: 20
-    - APPVEYOR_BUILD_WORKER_IMAGE: Visual Studio 2019
-      BUILD_TYPE: Release
-      GENERATOR_ARCH: x64
-      PYTHON: "C:\\Python38-x64"
-      CXX_STANDARD: 20
 
 install:
   - git submodule update --init --recursive
diff --git a/Vulkan-Headers b/Vulkan-Headers
index 670ffea..11c6670 160000
--- a/Vulkan-Headers
+++ b/Vulkan-Headers
@@ -1 +1 @@
-Subproject commit 670ffea9d61b9f4b8f68c919dab7caf33dfd9718
+Subproject commit 11c6670b4a4f766ed4f1e777d1b3c3dc082dfa5f
diff --git a/VulkanHppGenerator.cpp b/VulkanHppGenerator.cpp
index 251125c..d6d5c37 100644
--- a/VulkanHppGenerator.cpp
+++ b/VulkanHppGenerator.cpp
@@ -7781,44 +7781,19 @@ void VulkanHppGenerator::readEnums( tinyxml2::XMLElement const * element )
 
     // get the EnumData entry in enum map
     std::map<std::string, EnumData>::iterator it = m_enums.find( name );
-    if ( it == m_enums.end() )
-    {
-      // well, some enums are not listed in the <types> section
-      warn( false, line, "enum <" + name + "> is not listed as enum in the types section" );
-      it = m_enums.insert( std::make_pair( name, EnumData() ) ).first;
-
-      // add some "dummy" type in the types map
-      assert( m_types.find( name ) == m_types.end() );
-      m_types.insert( std::make_pair( name, TypeData( TypeCategory::Enum ) ) );
-    }
+    check( it != m_enums.end(), line, "enum <" + name + "> is not listed as enum in the types section" );
     check( it->second.values.empty(), line, "enum <" + name + "> already holds values" );
 
     // mark it as a bitmask, if it is one
     bool bitmask         = ( type == "bitmask" );
+    check( !bitmask || std::find_if( m_bitmasks.begin(),
+                                     m_bitmasks.end(),
+                                     [&name]( auto const & bitmask ) {
+                                       return bitmask.second.requirements == name;
+                                     } ) != m_bitmasks.end(),
+           line,
+           "enum <" + name + "> is not listed as an requires for any bitmask in the types section" );
     it->second.isBitmask = bitmask;
-    if ( bitmask )
-    {
-      // look for the corresponding bitmask and set the requirements if needed!
-      auto bitmaskIt = std::find_if( m_bitmasks.begin(), m_bitmasks.end(), [&name]( auto const & bitmask ) {
-        return bitmask.second.requirements == name;
-      } );
-      if ( bitmaskIt == m_bitmasks.end() )
-      {
-        warn( false, line, "enum <" + name + "> is not listed as an requires for any bitmask in the types section" );
-
-        std::string bitmaskName = name;
-        size_t      pos         = bitmaskName.rfind( "FlagBits" );
-        check( pos != std::string::npos, line, "enum <" + name + "> does not contain <FlagBits> as substring" );
-        bitmaskName.replace( pos, 8, "Flags" );
-
-        bitmaskIt = m_bitmasks.find( bitmaskName );
-        check( bitmaskIt != m_bitmasks.end(),
-               line,
-               "enum <" + name + "> has not corresponding bitmask <" + bitmaskName + "> listed in the types section" );
-        assert( bitmaskIt->second.requirements.empty() );
-        bitmaskIt->second.requirements = name;
-      }
-    }
 
     std::string prefix  = getEnumPrefix( line, name, bitmask );
     std::string postfix = getEnumPostfix( name, m_tags, prefix );
diff --git a/vulkan/vulkan.hpp b/vulkan/vulkan.hpp
index 47592c7..63bfce9 100644
--- a/vulkan/vulkan.hpp
+++ b/vulkan/vulkan.hpp
@@ -93,7 +93,7 @@ extern "C" __declspec( dllimport ) FARPROC __stdcall GetProcAddress( HINSTANCE h
 #  include <compare>
 #endif
 
-static_assert( VK_HEADER_VERSION == 160, "Wrong VK_HEADER_VERSION!" );
+static_assert( VK_HEADER_VERSION == 161, "Wrong VK_HEADER_VERSION!" );
 
 // 32-bit vulkan is not typesafe for handles, so don't allow copy constructors on this platform by default.
 // To enable this feature on 32-bit platforms please define VULKAN_HPP_TYPESAFE_CONVERSION
@@ -9211,15 +9211,6 @@ namespace VULKAN_HPP_NAMESPACE
     }
   }
 
-  enum class SemaphoreCreateFlagBits : VkSemaphoreCreateFlags
-  {
-  };
-
-  VULKAN_HPP_INLINE std::string to_string( SemaphoreCreateFlagBits )
-  {
-    return "(void)";
-  }
-
   enum class SemaphoreImportFlagBits : VkSemaphoreImportFlags
   {
     eTemporary = VK_SEMAPHORE_IMPORT_TEMPORARY_BIT
@@ -15371,6 +15362,15 @@ namespace VULKAN_HPP_NAMESPACE
     return "{ " + result.substr( 0, result.size() - 3 ) + " }";
   }
 
+  enum class SemaphoreCreateFlagBits : VkFlags
+  {
+  };
+
+  VULKAN_HPP_INLINE std::string to_string( SemaphoreCreateFlagBits )
+  {
+    return "(void)";
+  }
+
   using SemaphoreCreateFlags = Flags<SemaphoreCreateFlagBits>;
 
   VULKAN_HPP_INLINE std::string to_string( SemaphoreCreateFlags )