diff --git a/Carthage/Checkouts/GCDKit b/Carthage/Checkouts/GCDKit
index b927cd6..5d8c347 160000
--- a/Carthage/Checkouts/GCDKit
+++ b/Carthage/Checkouts/GCDKit
@@ -1 +1 @@
-Subproject commit b927cd65a88f50592f3468c845dffad44ad84ebd
+Subproject commit 5d8c34772c32573cb8892e83596071c80fcfe0ad
diff --git a/CoreStore.podspec b/CoreStore.podspec
index ceb2965..1783d31 100644
--- a/CoreStore.podspec
+++ b/CoreStore.podspec
@@ -18,5 +18,5 @@ Pod::Spec.new do |s|
     s.requires_arc = true
     s.pod_target_xcconfig = { 'OTHER_SWIFT_FLAGS' => '-D USE_FRAMEWORKS' }
     
-    s.dependency "GCDKit", "1.2.0"
+    s.dependency "GCDKit", "1.2.1"
 end
\ No newline at end of file
diff --git a/CoreStore/CartFile b/CoreStore/CartFile
new file mode 100644
index 0000000..02fe6a3
--- /dev/null
+++ b/CoreStore/CartFile
@@ -0,0 +1 @@
+github "JohnEstropia/GCDKit" == 1.2.1
diff --git a/Sources/Internal/NSManagedObjectModel+Setup.swift b/Sources/Internal/NSManagedObjectModel+Setup.swift
index 87fd899..ab17280 100644
--- a/Sources/Internal/NSManagedObjectModel+Setup.swift
+++ b/Sources/Internal/NSManagedObjectModel+Setup.swift
@@ -154,7 +154,7 @@ internal extension NSManagedObjectModel {
     }
     
     @nonobjc internal func entityTypesMapping() -> [String: NSManagedObject.Type] {
-    
+        
         var mapping = [String: NSManagedObject.Type]()
         self.entityNameMapping.forEach { (className, entityName) in
             
diff --git a/Sources/Migrating/MigrationChain.swift b/Sources/Migrating/MigrationChain.swift
index eb1a3a0..d544ffb 100644
--- a/Sources/Migrating/MigrationChain.swift
+++ b/Sources/Migrating/MigrationChain.swift
@@ -128,7 +128,7 @@ public struct MigrationChain: NilLiteralConvertible, StringLiteralConvertible, D
                 
                 return versionTree[tuple.1] == nil
                 
-            }.map { $1 }
+                }.map { $1 }
         )
         
         let isVersionAmbiguous = { (start: String) -> Bool in