diff --git a/Sources/NSValueTransformer+TransformerKit.m b/Sources/NSValueTransformer+TransformerKit.m
index 93edec0..aaa1611 100644
--- a/Sources/NSValueTransformer+TransformerKit.m
+++ b/Sources/NSValueTransformer+TransformerKit.m
@@ -20,7 +20,7 @@
 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 // THE SOFTWARE.
 
-#import "NSValueTransformer+TransformerKit.h"
+#import <TransformerKit/NSValueTransformer+TransformerKit.h>
 
 @import Darwin.Availability;
 @import ObjectiveC.runtime;
diff --git a/Sources/TTTCryptographyTransformers.h b/Sources/TTTCryptographyTransformers.h
index da960e5..406878f 100644
--- a/Sources/TTTCryptographyTransformers.h
+++ b/Sources/TTTCryptographyTransformers.h
@@ -21,7 +21,7 @@
 // THE SOFTWARE.
 
 @import Foundation;
-#import "NSValueTransformerName.h"
+#import <TransformerKit/NSValueTransformerName.h>
 
 NS_ASSUME_NONNULL_BEGIN
 
diff --git a/Sources/TTTCryptographyTransformers.m b/Sources/TTTCryptographyTransformers.m
index 3b16f94..bb18492 100644
--- a/Sources/TTTCryptographyTransformers.m
+++ b/Sources/TTTCryptographyTransformers.m
@@ -20,9 +20,9 @@
 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 // THE SOFTWARE.
 
-#import "TTTCryptographyTransformers.h"
+#import <TransformerKit/TTTCryptographyTransformers.h>
 
-#import "NSValueTransformer+TransformerKit.h"
+#import <TransformerKit/NSValueTransformer+TransformerKit.h>
 
 @import CommonCrypto;
 
diff --git a/Sources/TTTDataTransformers.h b/Sources/TTTDataTransformers.h
index 5e02d06..41d56e4 100644
--- a/Sources/TTTDataTransformers.h
+++ b/Sources/TTTDataTransformers.h
@@ -21,7 +21,7 @@
 // THE SOFTWARE.
 
 @import Foundation;
-#import "NSValueTransformerName.h"
+#import <TransformerKit/NSValueTransformerName.h>
 
 NS_ASSUME_NONNULL_BEGIN
 
diff --git a/Sources/TTTDataTransformers.m b/Sources/TTTDataTransformers.m
index 6a3ea34..3fe3314 100644
--- a/Sources/TTTDataTransformers.m
+++ b/Sources/TTTDataTransformers.m
@@ -22,9 +22,9 @@
 
 @import Security;
 
-#import "TTTDataTransformers.h"
+#import <TransformerKit/TTTDataTransformers.h>
 
-#import "NSValueTransformer+TransformerKit.h"
+#import <TransformerKit/NSValueTransformer+TransformerKit.h>
 
 NS_ASSUME_NONNULL_BEGIN
 
diff --git a/Sources/TTTDateTransformers.h b/Sources/TTTDateTransformers.h
index 4e9da05..16e346e 100644
--- a/Sources/TTTDateTransformers.h
+++ b/Sources/TTTDateTransformers.h
@@ -21,7 +21,7 @@
 // THE SOFTWARE.
 
 @import Foundation;
-#import "NSValueTransformerName.h"
+#import <TransformerKit/NSValueTransformerName.h>
 
 NS_ASSUME_NONNULL_BEGIN
 
diff --git a/Sources/TTTDateTransformers.m b/Sources/TTTDateTransformers.m
index ea7e19d..86fe578 100644
--- a/Sources/TTTDateTransformers.m
+++ b/Sources/TTTDateTransformers.m
@@ -20,9 +20,9 @@
 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 // THE SOFTWARE.
 
-#import "TTTDateTransformers.h"
+#import <TransformerKit/TTTDateTransformers.h>
 
-#import "NSValueTransformer+TransformerKit.h"
+#import <TransformerKit/NSValueTransformer+TransformerKit.h>
 
 @import Darwin.C.time;
 @import Darwin.C.xlocale;
diff --git a/Sources/TTTImageTransformers.h b/Sources/TTTImageTransformers.h
index 5235f48..d0baeda 100644
--- a/Sources/TTTImageTransformers.h
+++ b/Sources/TTTImageTransformers.h
@@ -26,7 +26,7 @@
 #elif __MAC_OS_X_VERSION_MIN_REQUIRED
 @import AppKit;
 #endif
-#import "NSValueTransformerName.h"
+#import <TransformerKit/NSValueTransformerName.h>
 
 NS_ASSUME_NONNULL_BEGIN
 
diff --git a/Sources/TTTImageTransformers.m b/Sources/TTTImageTransformers.m
index 45b978f..6637795 100644
--- a/Sources/TTTImageTransformers.m
+++ b/Sources/TTTImageTransformers.m
@@ -20,9 +20,9 @@
 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 // THE SOFTWARE.
 
-#import "TTTImageTransformers.h"
+#import <TransformerKit/TTTImageTransformers.h>
 
-#import "NSValueTransformer+TransformerKit.h"
+#import <TransformerKit/NSValueTransformer+TransformerKit.h>
 
 #if __IPHONE_OS_VERSION_MIN_REQUIRED
 #import <UIKit/UIKit.h>
diff --git a/Sources/TTTJSONTransformer.h b/Sources/TTTJSONTransformer.h
index ddde333..f3ce9a2 100644
--- a/Sources/TTTJSONTransformer.h
+++ b/Sources/TTTJSONTransformer.h
@@ -21,7 +21,7 @@
 // THE SOFTWARE.
 
 @import Foundation;
-#import "NSValueTransformerName.h"
+#import <TransformerKit/NSValueTransformerName.h>
 
 NS_ASSUME_NONNULL_BEGIN
 
diff --git a/Sources/TTTJSONTransformer.m b/Sources/TTTJSONTransformer.m
index 38e798a..1517564 100644
--- a/Sources/TTTJSONTransformer.m
+++ b/Sources/TTTJSONTransformer.m
@@ -20,8 +20,8 @@
 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 // THE SOFTWARE.
 
-#import "TTTJSONTransformer.h"
-#import "NSValueTransformer+TransformerKit.h"
+#import <TransformerKit/TTTJSONTransformer.h>
+#import <TransformerKit/NSValueTransformer+TransformerKit.h>
 
 NS_ASSUME_NONNULL_BEGIN
 
diff --git a/Sources/TTTStringTransformers.h b/Sources/TTTStringTransformers.h
index 57ba874..0366062 100644
--- a/Sources/TTTStringTransformers.h
+++ b/Sources/TTTStringTransformers.h
@@ -21,7 +21,7 @@
 // THE SOFTWARE.
 
 @import Foundation;
-#import "NSValueTransformerName.h"
+#import <TransformerKit/NSValueTransformerName.h>
 
 NS_ASSUME_NONNULL_BEGIN
 
diff --git a/Sources/TTTStringTransformers.m b/Sources/TTTStringTransformers.m
index 14e4581..608ab64 100644
--- a/Sources/TTTStringTransformers.m
+++ b/Sources/TTTStringTransformers.m
@@ -20,9 +20,9 @@
 // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 // THE SOFTWARE.
 
-#import "TTTStringTransformers.h"
+#import <TransformerKit/TTTStringTransformers.h>
 
-#import "NSValueTransformer+TransformerKit.h"
+#import <TransformerKit/NSValueTransformer+TransformerKit.h>
 
 NS_ASSUME_NONNULL_BEGIN
 
diff --git a/Sources/TransformerKit.h b/Sources/TransformerKit.h
index 4f82ba8..9284726 100644
--- a/Sources/TransformerKit.h
+++ b/Sources/TransformerKit.h
@@ -23,13 +23,14 @@
 #ifndef _TRANSFORMER_KIT_
     #define _TRANSFORMER_KIT_
 
-    #import "TTTDateTransformers.h"
-    #import "TTTImageTransformers.h"
-    #import "TTTStringTransformers.h"
-    #import "TTTJSONTransformer.h"
+    #import <TransformerKit/TTTDateTransformers.h>
+    #import <TransformerKit/TTTDateTransformers.h>
+    #import <TransformerKit/TTTImageTransformers.h>
+    #import <TransformerKit/TTTStringTransformers.h>
+    #import <TransformerKit/TTTJSONTransformer.h>
     #if __MAC_OS_X_VERSION_MIN_REQUIRED
-    #import "TTTDataTransformers.h"
-    #import "TTTCryptographyTransformers.h"
+    #import <TransformerKit/TTTDataTransformers.h>
+    #import <TransformerKit/TTTCryptographyTransformers.h>
     #endif
-    #import "NSValueTransformer+TransformerKit.h"
+    #import <TransformerKit/NSValueTransformer+TransformerKit.h>
 #endif
diff --git a/TransformerKit.xcodeproj/project.pbxproj b/TransformerKit.xcodeproj/project.pbxproj
index 8d1a4db..92320bf 100644
--- a/TransformerKit.xcodeproj/project.pbxproj
+++ b/TransformerKit.xcodeproj/project.pbxproj
@@ -230,7 +230,7 @@
 		BE13377B1C8CF76800117156 /* Project object */ = {
 			isa = PBXProject;
 			attributes = {
-				LastUpgradeCheck = 1140;
+				LastUpgradeCheck = 1250;
 				ORGANIZATIONNAME = Mattt;
 				TargetAttributes = {
 					BED5C6AD1C8CF80E00530969 = {
@@ -245,10 +245,9 @@
 			};
 			buildConfigurationList = BE13377E1C8CF76800117156 /* Build configuration list for PBXProject "TransformerKit" */;
 			compatibilityVersion = "Xcode 3.2";
-			developmentRegion = English;
+			developmentRegion = en;
 			hasScannedForEncodings = 0;
 			knownRegions = (
-				English,
 				en,
 				Base,
 			);
@@ -333,6 +332,7 @@
 				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
 				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_QUOTED_INCLUDE_IN_FRAMEWORK_HEADER = YES;
 				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
 				CLANG_WARN_STRICT_PROTOTYPES = YES;
 				CLANG_WARN_SUSPICIOUS_MOVE = YES;
@@ -386,6 +386,7 @@
 				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
 				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_QUOTED_INCLUDE_IN_FRAMEWORK_HEADER = YES;
 				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
 				CLANG_WARN_STRICT_PROTOTYPES = YES;
 				CLANG_WARN_SUSPICIOUS_MOVE = YES;
diff --git a/TransformerKit.xcodeproj/xcshareddata/xcschemes/TransformerKit iOS.xcscheme b/TransformerKit.xcodeproj/xcshareddata/xcschemes/TransformerKit iOS.xcscheme
index d0581df..750289f 100644
--- a/TransformerKit.xcodeproj/xcshareddata/xcschemes/TransformerKit iOS.xcscheme	
+++ b/TransformerKit.xcodeproj/xcshareddata/xcschemes/TransformerKit iOS.xcscheme	
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "1140"
+   LastUpgradeVersion = "1250"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
diff --git a/TransformerKit.xcodeproj/xcshareddata/xcschemes/TransformerKit macOS.xcscheme b/TransformerKit.xcodeproj/xcshareddata/xcschemes/TransformerKit macOS.xcscheme
index 0fc6a4c..2f18ed7 100644
--- a/TransformerKit.xcodeproj/xcshareddata/xcschemes/TransformerKit macOS.xcscheme	
+++ b/TransformerKit.xcodeproj/xcshareddata/xcschemes/TransformerKit macOS.xcscheme	
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "1140"
+   LastUpgradeVersion = "1250"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"