diff --git a/.gitignore b/.gitignore
index 25ba927..79edeb5 100644
--- a/.gitignore
+++ b/.gitignore
@@ -16,6 +16,7 @@ DerivedData/
 *.perspectivev3
 !default.perspectivev3
 xcuserdata/
+xcshareddata/
 
 ## Other
 *.moved-aside
diff --git a/DashboardUI.xcodeproj/project.pbxproj b/DashboardUI.xcodeproj/project.pbxproj
index 95777dc..cdc8999 100644
--- a/DashboardUI.xcodeproj/project.pbxproj
+++ b/DashboardUI.xcodeproj/project.pbxproj
@@ -222,7 +222,7 @@
 			isa = PBXProject;
 			attributes = {
 				LastSwiftUpdateCheck = 0730;
-				LastUpgradeCheck = 0920;
+				LastUpgradeCheck = 0940;
 				ORGANIZATIONNAME = stripe;
 				TargetAttributes = {
 					96FA3F3E1D4A592C0045B6B9 = {
@@ -361,12 +361,14 @@
 				CLANG_WARN_BOOL_CONVERSION = YES;
 				CLANG_WARN_COMMA = YES;
 				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
 				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
 				CLANG_WARN_EMPTY_BODY = YES;
 				CLANG_WARN_ENUM_CONVERSION = YES;
 				CLANG_WARN_INFINITE_RECURSION = YES;
 				CLANG_WARN_INT_CONVERSION = YES;
 				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
+				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
 				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
 				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
@@ -418,12 +420,14 @@
 				CLANG_WARN_BOOL_CONVERSION = YES;
 				CLANG_WARN_COMMA = YES;
 				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
 				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
 				CLANG_WARN_EMPTY_BODY = YES;
 				CLANG_WARN_ENUM_CONVERSION = YES;
 				CLANG_WARN_INFINITE_RECURSION = YES;
 				CLANG_WARN_INT_CONVERSION = YES;
 				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
+				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
 				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
 				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
 				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
diff --git a/DashboardUI.xcodeproj/xcshareddata/xcschemes/DashboardUI.xcscheme b/DashboardUI.xcodeproj/xcshareddata/xcschemes/DashboardUI.xcscheme
index fbced20..9991feb 100644
--- a/DashboardUI.xcodeproj/xcshareddata/xcschemes/DashboardUI.xcscheme
+++ b/DashboardUI.xcodeproj/xcshareddata/xcschemes/DashboardUI.xcscheme
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <Scheme
-   LastUpgradeVersion = "0920"
+   LastUpgradeVersion = "0940"
    version = "1.3">
    <BuildAction
       parallelizeBuildables = "YES"
@@ -54,7 +54,6 @@
       buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      language = ""
       shouldUseLaunchSchemeArgsEnv = "YES">
       <Testables>
          <TestableReference
@@ -84,7 +83,6 @@
       buildConfiguration = "Debug"
       selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.LLDB"
       selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.LLDB"
-      language = ""
       launchStyle = "0"
       useCustomWorkingDirectory = "NO"
       ignoresPersistentStateOnLaunch = "NO"
diff --git a/StripeDashboardUI.podspec b/StripeDashboardUI.podspec
index b9fd351..3e1e90d 100644
--- a/StripeDashboardUI.podspec
+++ b/StripeDashboardUI.podspec
@@ -14,4 +14,5 @@ Pod::Spec.new do |s|
   s.requires_arc = true
   s.ios.deployment_target = '9.0'
   s.ios.frameworks = ['UIKit', 'Foundation']
+  s.swift_version = '4.1'
 end