diff --git a/External/ReactiveCocoa b/External/ReactiveCocoa
index d942f42..d1cddce 160000
--- a/External/ReactiveCocoa
+++ b/External/ReactiveCocoa
@@ -1 +1 @@
-Subproject commit d942f4275da12bbf16753f2d1ea05d531ae92196
+Subproject commit d1cddcef521fc8d200fe45b66af7b41f066341ba
diff --git a/ReactiveViewModel/RVMViewModel.m b/ReactiveViewModel/RVMViewModel.m
index 50fc577..fd595c3 100644
--- a/ReactiveViewModel/RVMViewModel.m
+++ b/ReactiveViewModel/RVMViewModel.m
@@ -48,7 +48,7 @@ static const NSTimeInterval RVMViewModelInactiveThrottleInterval = 1;
 	if (_didBecomeActiveSignal == nil) {
 		@weakify(self);
 
-		_didBecomeActiveSignal = [[[RACObserve(self.active)
+		_didBecomeActiveSignal = [[[RACObserve(self, active)
 			filter:^(NSNumber *active) {
 				return active.boolValue;
 			}]
@@ -66,7 +66,7 @@ static const NSTimeInterval RVMViewModelInactiveThrottleInterval = 1;
 	if (_didBecomeInactiveSignal == nil) {
 		@weakify(self);
 
-		_didBecomeInactiveSignal = [[[RACObserve(self.active)
+		_didBecomeInactiveSignal = [[[RACObserve(self, active)
 			filter:^ BOOL (NSNumber *active) {
 				return !active.boolValue;
 			}]
@@ -100,7 +100,7 @@ static const NSTimeInterval RVMViewModelInactiveThrottleInterval = 1;
 - (RACSignal *)forwardSignalWhileActive:(RACSignal *)signal {
 	NSParameterAssert(signal != nil);
 
-	RACSignal *activeSignal = RACObserve(self.active);
+	RACSignal *activeSignal = RACObserve(self, active);
 
 	return [[RACSignal
 		createSignal:^(id<RACSubscriber> subscriber) {
@@ -139,7 +139,7 @@ static const NSTimeInterval RVMViewModelInactiveThrottleInterval = 1;
 
 	signal = [signal replayLast];
 
-	return [[[[[RACObserve(self.active)
+	return [[[[[RACObserve(self, active)
 		takeUntil:[signal ignoreValues]]
 		combineLatestWith:signal]
 		throttle:RVMViewModelInactiveThrottleInterval valuesPassingTest:^ BOOL (RACTuple *xs) {
@@ -163,11 +163,4 @@ static const NSTimeInterval RVMViewModelInactiveThrottleInterval = 1;
 	return [super automaticallyNotifiesObserversForKey:key];
 }
 
-- (void)setNilValueForKey:(NSString *)key {
-	// Ignore attempts to set primitive properties to nil. This is commonly
-	// caused by RACObserve noticing an intermediate key change.
-	//
-	// See https://github.com/ReactiveCocoa/ReactiveCocoa/issues/631.
-}
-
 @end