diff --git a/KeenClient.podspec b/KeenClient.podspec
index b42f9fa..bd6d776 100644
--- a/KeenClient.podspec
+++ b/KeenClient.podspec
@@ -2,7 +2,7 @@ Pod::Spec.new do |spec|
   spec.name         = 'KeenClient'
   spec.version      = '3.7.0'
   spec.license      = { :type => 'MIT' }
-  spec.ios.deployment_target = '6.0'
+  spec.ios.deployment_target = '8.0'
   spec.osx.deployment_target = '10.9'
   spec.homepage     = 'https://github.com/keenlabs/KeenClient-iOS'
 
@@ -23,6 +23,9 @@ Pod::Spec.new do |spec|
   spec.public_header_files = 'KeenClient/*.h'
   spec.requires_arc = true
   spec.frameworks = 'SystemConfiguration', 'CoreLocation', 'CFNetwork'
+  spec.pod_target_xcconfig = {
+    'CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF' => 'NO',
+  }
 
   spec.subspec 'keen_sqlite' do |ks|
     ks.source_files = 'Library/sqlite-amalgamation/*.{h,c}'
diff --git a/KeenClient.xcodeproj/project.pbxproj b/KeenClient.xcodeproj/project.pbxproj
index 50056ef..41aac3c 100644
--- a/KeenClient.xcodeproj/project.pbxproj
+++ b/KeenClient.xcodeproj/project.pbxproj
@@ -890,7 +890,6 @@
 		0111015814EF71FB009794A5 /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				IPHONEOS_DEPLOYMENT_TARGET = 7.0;
 				ONLY_ACTIVE_ARCH = NO;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 			};
@@ -899,7 +898,6 @@
 		0111015914EF71FB009794A5 /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
-				IPHONEOS_DEPLOYMENT_TARGET = 7.0;
 				ONLY_ACTIVE_ARCH = NO;
 				PRODUCT_NAME = "$(TARGET_NAME)";
 			};
@@ -909,6 +907,8 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
+				CLANG_WARN_STRICT_PROTOTYPES = YES;
 				COPY_PHASE_STRIP = NO;
 				ENABLE_TESTABILITY = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu99;
@@ -923,7 +923,7 @@
 				GCC_WARN_ABOUT_MISSING_PROTOTYPES = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 7.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
 				ONLY_ACTIVE_ARCH = YES;
 				SDKROOT = iphoneos;
 			};
@@ -933,13 +933,15 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ALWAYS_SEARCH_USER_PATHS = NO;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
+				CLANG_WARN_STRICT_PROTOTYPES = YES;
 				COPY_PHASE_STRIP = YES;
 				GCC_C_LANGUAGE_STANDARD = gnu99;
 				GCC_VERSION = "";
 				GCC_WARN_ABOUT_MISSING_PROTOTYPES = YES;
 				GCC_WARN_ABOUT_RETURN_TYPE = YES;
 				GCC_WARN_UNUSED_VARIABLE = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 7.0;
+				IPHONEOS_DEPLOYMENT_TARGET = 8.0;
 				SDKROOT = iphoneos;
 				VALIDATE_PRODUCT = YES;
 			};
@@ -949,6 +951,7 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				CLANG_ENABLE_OBJC_ARC = YES;
+				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
 				DSTROOT = /tmp/KeenClient.dst;
 				GCC_GENERATE_TEST_COVERAGE_FILES = NO;
 				GCC_INSTRUMENT_PROGRAM_FLOW_ARCS = NO;
@@ -957,7 +960,6 @@
 				GCC_PREPROCESSOR_DEFINITIONS = "$(inherited)";
 				"GCC_PREPROCESSOR_DEFINITIONS[arch=*]" = "$(inherited)";
 				GCC_THUMB_SUPPORT = NO;
-				IPHONEOS_DEPLOYMENT_TARGET = 7.0;
 				LIBRARY_SEARCH_PATHS = (
 					"$(inherited)",
 					"\"$(SRCROOT)/Library\"",
@@ -973,11 +975,11 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				CLANG_ENABLE_OBJC_ARC = YES;
+				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
 				DSTROOT = /tmp/KeenClient.dst;
 				GCC_PRECOMPILE_PREFIX_HEADER = YES;
 				GCC_PREFIX_HEADER = "$(PROJECT_DIR)/KeenClient/KeenClient-Prefix.pch";
 				GCC_THUMB_SUPPORT = NO;
-				IPHONEOS_DEPLOYMENT_TARGET = 7.0;
 				LIBRARY_SEARCH_PATHS = (
 					"$(inherited)",
 					"\"$(SRCROOT)/Library\"",
@@ -1076,7 +1078,6 @@
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 7.0;
 				MACOSX_DEPLOYMENT_TARGET = 10.9;
 				ONLY_ACTIVE_ARCH = NO;
 				PRODUCT_NAME = "$(TARGET_NAME)";
@@ -1114,7 +1115,6 @@
 				GCC_WARN_UNDECLARED_SELECTOR = YES;
 				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
 				GCC_WARN_UNUSED_FUNCTION = YES;
-				IPHONEOS_DEPLOYMENT_TARGET = 7.0;
 				MACOSX_DEPLOYMENT_TARGET = 10.9;
 				ONLY_ACTIVE_ARCH = NO;
 				PRODUCT_NAME = "$(TARGET_NAME)";
diff --git a/KeenClient/KIOUploader.h b/KeenClient/KIOUploader.h
index 5e8a61d..12bf41a 100644
--- a/KeenClient/KIOUploader.h
+++ b/KeenClient/KIOUploader.h
@@ -23,6 +23,6 @@
 - (instancetype)initWithNetwork:(KIONetwork *)network andStore:(KIODBStore *)store;
 
 // Upload events in the store for a given project
-- (void)uploadEventsForConfig:(KeenClientConfig *)config completionHandler:(void (^)())completionHandler;
+- (void)uploadEventsForConfig:(KeenClientConfig *)config completionHandler:(void (^)(void))completionHandler;
 
 @end
diff --git a/KeenClient/KIOUploader.m b/KeenClient/KIOUploader.m
index 2cc78cd..b51b69c 100644
--- a/KeenClient/KIOUploader.m
+++ b/KeenClient/KIOUploader.m
@@ -20,7 +20,7 @@ @interface KIOUploader ()
 
 - (BOOL)isNetworkConnected;
 
-- (void)runUploadFinishedBlock:(void (^)())block;
+- (void)runUploadFinishedBlock:(void (^)(void))block;
 
 /**
  Handles the HTTP response from the Keen Event API.  This involves deserializing the JSON response
@@ -151,7 +151,7 @@ - (BOOL)isNetworkConnected {
     return [hostReachability KIOcurrentReachabilityStatus] != NotReachable;
 }
 
-- (void)uploadEventsForConfig:(KeenClientConfig *)config completionHandler:(void (^)())completionHandler {
+- (void)uploadEventsForConfig:(KeenClientConfig *)config completionHandler:(void (^)(void))completionHandler {
     dispatch_async(self.uploadQueue, ^{
         if (![self isNetworkConnected]) {
             [self runUploadFinishedBlock:completionHandler];
@@ -207,7 +207,7 @@ - (void)uploadEventsForConfig:(KeenClientConfig *)config completionHandler:(void
     });
 }
 
-- (void)runUploadFinishedBlock:(void (^)())block {
+- (void)runUploadFinishedBlock:(void (^)(void))block {
     if (block) {
         KCLogVerbose(@"Running user-specified block.");
         block();
diff --git a/KeenClient/KeenClient.h b/KeenClient/KeenClient.h
index 5464aa1..40d21ac 100644
--- a/KeenClient/KeenClient.h
+++ b/KeenClient/KeenClient.h
@@ -327,7 +327,7 @@ typedef void (^AnalysisCompletionBlock)(NSData *responseData, NSURLResponse *res
  @param block The block to be executed once uploading is finished, regardless of whether or not the upload succeeded.
  The block is also called when no upload was necessary because no events were captured.
  */
-- (void)uploadWithFinishedBlock:(void (^)())block;
+- (void)uploadWithFinishedBlock:(void (^)(void))block;
 
 /**
  Refresh the current geo location. The Keen Client only gets geo at the beginning of each session (i.e. when the client
diff --git a/KeenClient/KeenClient.m b/KeenClient/KeenClient.m
index 774c411..c01c5ab 100644
--- a/KeenClient/KeenClient.m
+++ b/KeenClient/KeenClient.m
@@ -340,7 +340,7 @@ - (void)refreshCurrentLocation {
         if ([KeenClient isLocationAuthorized:clAuthStatus]) {
             [self startMonitoringLocation];
         }
-#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 80000
+#if TARGET_OS_IPHONE
         // Else, try and request permission for that.
         else if (geoLocationRequestEnabled &&
                  [self.locationManager respondsToSelector:@selector(requestAlwaysAuthorization)]) {
@@ -378,8 +378,8 @@ + (BOOL)isLocationAuthorized:(CLAuthorizationStatus)status {
 
 // Delegate method from the CLLocationManagerDelegate protocol.
 - (void)locationManager:(CLLocationManager *)manager
-    didUpdateToLocation:(CLLocation *)newLocation
-           fromLocation:(CLLocation *)oldLocation {
+     didUpdateLocations:(NSArray<CLLocation *> *)locations {
+    CLLocation *newLocation = locations.lastObject;
     // If it's a relatively recent event, turn off updates to save power
     NSDate *eventDate = newLocation.timestamp;
     NSTimeInterval howRecent = [eventDate timeIntervalSinceNow];
@@ -563,7 +563,7 @@ - (void)importFileData {
     [KIOFileStore importFileDataWithProjectID:self.config.projectID];
 }
 
-- (void)uploadWithFinishedBlock:(void (^)())block {
+- (void)uploadWithFinishedBlock:(void (^)(void))block {
     [self.uploader uploadEventsForConfig:self.config completionHandler:block];
 }