diff --git a/src/Sentry.Bindings.Cocoa/ApiDefinitions.cs b/src/Sentry.Bindings.Cocoa/ApiDefinitions.cs
index f33b1c6815..2c076ddf1a 100644
--- a/src/Sentry.Bindings.Cocoa/ApiDefinitions.cs
+++ b/src/Sentry.Bindings.Cocoa/ApiDefinitions.cs
@@ -416,9 +416,9 @@ interface SentryEnvelopeItemHeader : SentrySerializable
     [Export ("initWithType:length:filenname:contentType:")]
     NativeHandle Constructor (string type, nuint length, string filename, string contentType);
 
-    // -(instancetype _Nonnull)initWithType:(NSString * _Nonnull)type length:(NSUInteger)length contentType:(NSString * _Nonnull)contentType itemCount:(NSNumber * _Nonnull)itemCount;
+    // -(instancetype _Nonnull)initWithType:(NSString * _Nonnull)type length:(NSUInteger)length contentType:(NSString * _Nullable)contentType itemCount:(NSNumber * _Nonnull)itemCount;
     [Export ("initWithType:length:contentType:itemCount:")]
-    NativeHandle Constructor (string type, nuint length, string contentType, NSNumber itemCount);
+    NativeHandle Constructor (string type, nuint length, [NullAllowed] string contentType, NSNumber itemCount);
 
     // @property (readonly, copy, nonatomic) NSString * _Nonnull type;
     [Export ("type")]
diff --git a/src/Sentry.Bindings.Cocoa/Sentry.Bindings.Cocoa.csproj b/src/Sentry.Bindings.Cocoa/Sentry.Bindings.Cocoa.csproj
index 860b0f2db4..29d9354ed5 100644
--- a/src/Sentry.Bindings.Cocoa/Sentry.Bindings.Cocoa.csproj
+++ b/src/Sentry.Bindings.Cocoa/Sentry.Bindings.Cocoa.csproj
@@ -12,7 +12,7 @@
     <SentryCocoaProperties>$([System.IO.File]::ReadAllText("$(MSBuildThisFileDirectory)../../modules/sentry-cocoa.properties"))</SentryCocoaProperties>
     <SentryCocoaVersion>$([System.Text.RegularExpressions.Regex]::Match($(SentryCocoaProperties), 'version\s*=\s*([^\s]+)').Groups[1].Value)</SentryCocoaVersion>
     <SentryCocoaFramework>$(SentryCocoaCache)Sentry-$(SentryCocoaVersion).xcframework</SentryCocoaFramework>
-    <SentryCocoaBindingInputs>../../modules/sentry-cocoa.properties;../../scripts/generate-cocoa-bindings.ps1</SentryCocoaBindingInputs>
+    <SentryCocoaBindingInputs>../../modules/sentry-cocoa.properties;../../scripts/generate-cocoa-bindings.ps1;$(SentryCocoaFrameworkHeaders)**/*.h</SentryCocoaBindingInputs>
     <!-- SentrySpan.g.cs: error CS0108: 'ISentrySpan.Serialize()' hides inherited member 'ISentrySerializable.Serialize()'. Use the new keyword if hiding was intended -->
     <NoWarn>$(NoWarn);CS0108</NoWarn>
   </PropertyGroup>
@@ -20,7 +20,7 @@
   <!-- Override values for local Cocoa SDK builds -->
   <PropertyGroup Condition="Exists('$(SentryCocoaCache).git')">
     <SentryCocoaFramework>$(SentryCocoaCache)Carthage\Build-$(TargetPlatformIdentifier)\Sentry.xcframework</SentryCocoaFramework>
-    <SentryCocoaBindingInputs>../../scripts/generate-cocoa-bindings.ps1;../../modules/sentry-cocoa/Carthage/.built-from-sha</SentryCocoaBindingInputs>
+    <SentryCocoaBindingInputs>../../scripts/generate-cocoa-bindings.ps1;$(SentryCocoaCache)Carthage/.built-from-sha;$(SentryCocoaCache)Carthage/**/*.h</SentryCocoaBindingInputs>
   </PropertyGroup>
 
   <!-- Build empty assemblies when not on macOS, to pass the solution build. -->