diff --git a/Pod/Core/Public/Models/APContact.h b/Pod/Core/Public/Models/APContact.h
index 2ceceaa..66dd049 100755
--- a/Pod/Core/Public/Models/APContact.h
+++ b/Pod/Core/Public/Models/APContact.h
@@ -21,7 +21,7 @@
 
 @interface APContact : NSObject
 
-@property (nullable, nonatomic, strong) NSNumber *recordID;
+@property (nonnull, nonatomic, strong) NSNumber *recordID;
 @property (nullable, nonatomic, strong) APName *name;
 @property (nullable, nonatomic, strong) APJob *job;
 @property (nullable, nonatomic, strong) UIImage *thumbnail;
diff --git a/Pod/Core/Public/Models/APRecordDate.h b/Pod/Core/Public/Models/APRecordDate.h
index 935ef17..b303a97 100644
--- a/Pod/Core/Public/Models/APRecordDate.h
+++ b/Pod/Core/Public/Models/APRecordDate.h
@@ -10,7 +10,7 @@
 
 @interface APRecordDate : NSObject
 
-@property (nullable, nonatomic, strong) NSDate *creationDate;
-@property (nullable, nonatomic, strong) NSDate *modificationDate;
+@property (nonnull, nonatomic, strong) NSDate *creationDate;
+@property (nonnull, nonatomic, strong) NSDate *modificationDate;
 
 @end
\ No newline at end of file
diff --git a/Pod/Core/Public/Models/APSource.h b/Pod/Core/Public/Models/APSource.h
index c867468..8b96e99 100644
--- a/Pod/Core/Public/Models/APSource.h
+++ b/Pod/Core/Public/Models/APSource.h
@@ -10,7 +10,7 @@
 
 @interface APSource : NSObject
 
-@property (nullable, nonatomic, strong) NSString *sourceType;
-@property (nullable, nonatomic, strong) NSNumber *sourceID;
+@property (nonnull, nonatomic, strong) NSString *sourceType;
+@property (nonnull, nonatomic, strong) NSNumber *sourceID;
 
 @end
\ No newline at end of file