diff --git a/SignalServiceKit/protobuf/OWSSignalServiceProtos.proto b/SignalServiceKit/protobuf/OWSSignalServiceProtos.proto
index 477e964f6a..b7143f49c1 100644
--- a/SignalServiceKit/protobuf/OWSSignalServiceProtos.proto
+++ b/SignalServiceKit/protobuf/OWSSignalServiceProtos.proto
@@ -154,11 +154,6 @@ message SyncMessage {
   optional Blocked  blocked  = 6;
   optional Verified verified = 7;
   optional bytes    padding  = 8;
-  // Signal-iOS includes profileKey in *every* Sync message
-  // We should change this so as not to bloat our sync message size
-  // since sync messages are sent all the time and we only need to
-  // send a key once.
-  optional bytes    profileKey = 9;
 }
 
 message AttachmentPointer {
diff --git a/SignalServiceKit/src/Messages/DeviceSyncing/OWSOutgoingSyncMessage.m b/SignalServiceKit/src/Messages/DeviceSyncing/OWSOutgoingSyncMessage.m
index 6f6ea96a06..d1e87ab3ad 100644
--- a/SignalServiceKit/src/Messages/DeviceSyncing/OWSOutgoingSyncMessage.m
+++ b/SignalServiceKit/src/Messages/DeviceSyncing/OWSOutgoingSyncMessage.m
@@ -32,8 +32,6 @@ NS_ASSUME_NONNULL_BEGIN
     size_t paddingBytesLength = arc4random_uniform(512) + 1;
     builder.padding = [Cryptography generateRandomBytes:paddingBytesLength];
 
-    [builder addLocalProfileKey];
-
     return [builder build];
 }
 
diff --git a/SignalServiceKit/src/Messages/OWSSignalServiceProtos.pb.h b/SignalServiceKit/src/Messages/OWSSignalServiceProtos.pb.h
index 9f365d3a48..af214bbded 100644
--- a/SignalServiceKit/src/Messages/OWSSignalServiceProtos.pb.h
+++ b/SignalServiceKit/src/Messages/OWSSignalServiceProtos.pb.h
@@ -1007,7 +1007,6 @@ NSString *NSStringFromOWSSignalServiceProtosGroupContextType(OWSSignalServicePro
 #define SyncMessage_blocked @"blocked"
 #define SyncMessage_verified @"verified"
 #define SyncMessage_padding @"padding"
-#define SyncMessage_profileKey @"profileKey"
 @interface OWSSignalServiceProtosSyncMessage : PBGeneratedMessage<GeneratedMessageProtocol> {
 @private
   BOOL hasSent_:1;
@@ -1017,7 +1016,6 @@ NSString *NSStringFromOWSSignalServiceProtosGroupContextType(OWSSignalServicePro
   BOOL hasBlocked_:1;
   BOOL hasVerified_:1;
   BOOL hasPadding_:1;
-  BOOL hasProfileKey_:1;
   OWSSignalServiceProtosSyncMessageSent* sent;
   OWSSignalServiceProtosSyncMessageContacts* contacts;
   OWSSignalServiceProtosSyncMessageGroups* groups;
@@ -1025,7 +1023,6 @@ NSString *NSStringFromOWSSignalServiceProtosGroupContextType(OWSSignalServicePro
   OWSSignalServiceProtosSyncMessageBlocked* blocked;
   OWSSignalServiceProtosVerified* verified;
   NSData* padding;
-  NSData* profileKey;
   NSMutableArray * readArray;
 }
 - (BOOL) hasSent;
@@ -1035,7 +1032,6 @@ NSString *NSStringFromOWSSignalServiceProtosGroupContextType(OWSSignalServicePro
 - (BOOL) hasBlocked;
 - (BOOL) hasVerified;
 - (BOOL) hasPadding;
-- (BOOL) hasProfileKey;
 @property (readonly, strong) OWSSignalServiceProtosSyncMessageSent* sent;
 @property (readonly, strong) OWSSignalServiceProtosSyncMessageContacts* contacts;
 @property (readonly, strong) OWSSignalServiceProtosSyncMessageGroups* groups;
@@ -1044,7 +1040,6 @@ NSString *NSStringFromOWSSignalServiceProtosGroupContextType(OWSSignalServicePro
 @property (readonly, strong) OWSSignalServiceProtosSyncMessageBlocked* blocked;
 @property (readonly, strong) OWSSignalServiceProtosVerified* verified;
 @property (readonly, strong) NSData* padding;
-@property (readonly, strong) NSData* profileKey;
 - (OWSSignalServiceProtosSyncMessageRead*)readAtIndex:(NSUInteger)index;
 
 + (instancetype) defaultInstance;
@@ -1490,11 +1485,6 @@ NSString *NSStringFromOWSSignalServiceProtosGroupContextType(OWSSignalServicePro
 - (NSData*) padding;
 - (OWSSignalServiceProtosSyncMessageBuilder*) setPadding:(NSData*) value;
 - (OWSSignalServiceProtosSyncMessageBuilder*) clearPadding;
-
-- (BOOL) hasProfileKey;
-- (NSData*) profileKey;
-- (OWSSignalServiceProtosSyncMessageBuilder*) setProfileKey:(NSData*) value;
-- (OWSSignalServiceProtosSyncMessageBuilder*) clearProfileKey;
 @end
 
 #define AttachmentPointer_id @"id"
diff --git a/SignalServiceKit/src/Messages/OWSSignalServiceProtos.pb.m b/SignalServiceKit/src/Messages/OWSSignalServiceProtos.pb.m
index 91ab7e1182..b64ef57bec 100644
--- a/SignalServiceKit/src/Messages/OWSSignalServiceProtos.pb.m
+++ b/SignalServiceKit/src/Messages/OWSSignalServiceProtos.pb.m
@@ -3947,7 +3947,6 @@ NSString *NSStringFromOWSSignalServiceProtosVerifiedState(OWSSignalServiceProtos
 @property (strong) OWSSignalServiceProtosSyncMessageBlocked* blocked;
 @property (strong) OWSSignalServiceProtosVerified* verified;
 @property (strong) NSData* padding;
-@property (strong) NSData* profileKey;
 @end
 
 @implementation OWSSignalServiceProtosSyncMessage
@@ -4003,13 +4002,6 @@ NSString *NSStringFromOWSSignalServiceProtosVerifiedState(OWSSignalServiceProtos
   hasPadding_ = !!_value_;
 }
 @synthesize padding;
-- (BOOL) hasProfileKey {
-  return !!hasProfileKey_;
-}
-- (void) setHasProfileKey:(BOOL) _value_ {
-  hasProfileKey_ = !!_value_;
-}
-@synthesize profileKey;
 - (instancetype) init {
   if ((self = [super init])) {
     self.sent = [OWSSignalServiceProtosSyncMessageSent defaultInstance];
@@ -4019,7 +4011,6 @@ NSString *NSStringFromOWSSignalServiceProtosVerifiedState(OWSSignalServiceProtos
     self.blocked = [OWSSignalServiceProtosSyncMessageBlocked defaultInstance];
     self.verified = [OWSSignalServiceProtosVerified defaultInstance];
     self.padding = [NSData data];
-    self.profileKey = [NSData data];
   }
   return self;
 }
@@ -4069,9 +4060,6 @@ static OWSSignalServiceProtosSyncMessage* defaultOWSSignalServiceProtosSyncMessa
   if (self.hasPadding) {
     [output writeData:8 value:self.padding];
   }
-  if (self.hasProfileKey) {
-    [output writeData:9 value:self.profileKey];
-  }
   [self.unknownFields writeToCodedOutputStream:output];
 }
 - (SInt32) serializedSize {
@@ -4105,9 +4093,6 @@ static OWSSignalServiceProtosSyncMessage* defaultOWSSignalServiceProtosSyncMessa
   if (self.hasPadding) {
     size_ += computeDataSize(8, self.padding);
   }
-  if (self.hasProfileKey) {
-    size_ += computeDataSize(9, self.profileKey);
-  }
   size_ += self.unknownFields.serializedSize;
   memoizedSerializedSize = size_;
   return size_;
@@ -4188,9 +4173,6 @@ static OWSSignalServiceProtosSyncMessage* defaultOWSSignalServiceProtosSyncMessa
   if (self.hasPadding) {
     [output appendFormat:@"%@%@: %@\n", indent, @"padding", self.padding];
   }
-  if (self.hasProfileKey) {
-    [output appendFormat:@"%@%@: %@\n", indent, @"profileKey", self.profileKey];
-  }
   [self.unknownFields writeDescriptionTo:output withIndent:indent];
 }
 - (void) storeInDictionary:(NSMutableDictionary *)dictionary {
@@ -4232,9 +4214,6 @@ static OWSSignalServiceProtosSyncMessage* defaultOWSSignalServiceProtosSyncMessa
   if (self.hasPadding) {
     [dictionary setObject: self.padding forKey: @"padding"];
   }
-  if (self.hasProfileKey) {
-    [dictionary setObject: self.profileKey forKey: @"profileKey"];
-  }
   [self.unknownFields storeInDictionary:dictionary];
 }
 - (BOOL) isEqual:(id)other {
@@ -4261,8 +4240,6 @@ static OWSSignalServiceProtosSyncMessage* defaultOWSSignalServiceProtosSyncMessa
       (!self.hasVerified || [self.verified isEqual:otherMessage.verified]) &&
       self.hasPadding == otherMessage.hasPadding &&
       (!self.hasPadding || [self.padding isEqual:otherMessage.padding]) &&
-      self.hasProfileKey == otherMessage.hasProfileKey &&
-      (!self.hasProfileKey || [self.profileKey isEqual:otherMessage.profileKey]) &&
       (self.unknownFields == otherMessage.unknownFields || (self.unknownFields != nil && [self.unknownFields isEqual:otherMessage.unknownFields]));
 }
 - (NSUInteger) hash {
@@ -4291,9 +4268,6 @@ static OWSSignalServiceProtosSyncMessage* defaultOWSSignalServiceProtosSyncMessa
   if (self.hasPadding) {
     hashCode = hashCode * 31 + [self.padding hash];
   }
-  if (self.hasProfileKey) {
-    hashCode = hashCode * 31 + [self.profileKey hash];
-  }
   hashCode = hashCode * 31 + [self.unknownFields hash];
   return hashCode;
 }
@@ -5966,9 +5940,6 @@ static OWSSignalServiceProtosSyncMessageRead* defaultOWSSignalServiceProtosSyncM
   if (other.hasPadding) {
     [self setPadding:other.padding];
   }
-  if (other.hasProfileKey) {
-    [self setProfileKey:other.profileKey];
-  }
   [self mergeUnknownFields:other.unknownFields];
   return self;
 }
@@ -6054,10 +6025,6 @@ static OWSSignalServiceProtosSyncMessageRead* defaultOWSSignalServiceProtosSyncM
         [self setPadding:[input readData]];
         break;
       }
-      case 74: {
-        [self setProfileKey:[input readData]];
-        break;
-      }
     }
   }
 }
@@ -6278,22 +6245,6 @@ static OWSSignalServiceProtosSyncMessageRead* defaultOWSSignalServiceProtosSyncM
   resultSyncMessage.padding = [NSData data];
   return self;
 }
-- (BOOL) hasProfileKey {
-  return resultSyncMessage.hasProfileKey;
-}
-- (NSData*) profileKey {
-  return resultSyncMessage.profileKey;
-}
-- (OWSSignalServiceProtosSyncMessageBuilder*) setProfileKey:(NSData*) value {
-  resultSyncMessage.hasProfileKey = YES;
-  resultSyncMessage.profileKey = value;
-  return self;
-}
-- (OWSSignalServiceProtosSyncMessageBuilder*) clearProfileKey {
-  resultSyncMessage.hasProfileKey = NO;
-  resultSyncMessage.profileKey = [NSData data];
-  return self;
-}
 @end
 
 @interface OWSSignalServiceProtosAttachmentPointer ()
diff --git a/SignalServiceKit/src/Protocols/ProtoBuf+OWS.h b/SignalServiceKit/src/Protocols/ProtoBuf+OWS.h
index 1a2d18ef28..3ce1fc1d6d 100644
--- a/SignalServiceKit/src/Protocols/ProtoBuf+OWS.h
+++ b/SignalServiceKit/src/Protocols/ProtoBuf+OWS.h
@@ -28,12 +28,4 @@ NS_ASSUME_NONNULL_BEGIN
 
 @end
 
-#pragma mark -
-
-@interface OWSSignalServiceProtosSyncMessageBuilder (OWS)
-
-- (void)addLocalProfileKey;
-
-@end
-
 NS_ASSUME_NONNULL_END
diff --git a/SignalServiceKit/src/Protocols/ProtoBuf+OWS.m b/SignalServiceKit/src/Protocols/ProtoBuf+OWS.m
index 2d8a246784..a5afc5a45d 100644
--- a/SignalServiceKit/src/Protocols/ProtoBuf+OWS.m
+++ b/SignalServiceKit/src/Protocols/ProtoBuf+OWS.m
@@ -90,15 +90,4 @@ NS_ASSUME_NONNULL_BEGIN
 
 @end
 
-#pragma mark -
-
-@implementation OWSSignalServiceProtosSyncMessageBuilder (OWS)
-
-- (void)addLocalProfileKey
-{
-    [self setProfileKey:self.localProfileKey.keyData];
-}
-
-@end
-
 NS_ASSUME_NONNULL_END