diff --git a/lib/socket/socket.react.js b/lib/socket/socket.react.js
--- a/lib/socket/socket.react.js
+++ b/lib/socket/socket.react.js
@@ -106,7 +106,7 @@
   +preRequestUserState: PreRequestUserState,
   +lastCommunicatedPlatformDetails: ?PlatformDetails,
   +decompressSocketMessage: CompressedData => string,
-  +activeSessionRecovery: null | RecoveryFromReduxActionSource,
+  +activeSessionRecovery?: null | RecoveryFromReduxActionSource,
   +dispatch: Dispatch,
   +dispatchActionPromise: DispatchActionPromise,
   +fetchPendingUpdates: FetchPendingUpdatesInput => Promise<ClientStateSyncSocketResult>,
diff --git a/lib/types/community-types.js b/lib/types/community-types.js
--- a/lib/types/community-types.js
+++ b/lib/types/community-types.js
@@ -47,7 +47,7 @@
 export type ClientCommunityInfoWithCommunityName = $ReadOnly<{
   ...ServerCommunityInfo,
   +communityName: string,
-  +threadInfo: ThinRawThreadInfo | null,
+  +threadInfo?: ThinRawThreadInfo,
 }>;
 
 export const clientCommunityInfoWithCommunityNameValidator: TInterface<ClientCommunityInfoWithCommunityName> =
diff --git a/lib/types/relationship-types.js b/lib/types/relationship-types.js
--- a/lib/types/relationship-types.js
+++ b/lib/types/relationship-types.js
@@ -89,7 +89,7 @@
   | LegacyFarcasterRelationshipRequest;
 
 export type RelationshipRequestUserInfo = {
-  +createRobotextInThinThread: boolean,
+  +createRobotextInThinThread?: boolean,
 };
 export type RelationshipRequestWithRobotext = {
   +action: 'farcaster' | 'friend',
diff --git a/lib/types/socket-types.js b/lib/types/socket-types.js
--- a/lib/types/socket-types.js
+++ b/lib/types/socket-types.js
@@ -364,7 +364,7 @@
   +type: 3,
   +responseTo: number,
   +message: string,
-  +sessionChange: SessionChange,
+  +sessionChange?: SessionChange,
 };
 export const authErrorServerSocketMessageValidator: TInterface<AuthErrorServerSocketMessage> =
   tShape<AuthErrorServerSocketMessage>({
@@ -516,7 +516,7 @@
   +connectionIssue: ?ConnectionIssue,
   // When this is flipped to truthy, a session recovery is attempted
   // This can happen when the keyserver invalidates the session
-  +activeSessionRecovery: null | RecoveryFromReduxActionSource,
+  +activeSessionRecovery?: null | RecoveryFromReduxActionSource,
 };
 export const connectionInfoValidator: TInterface<ConnectionInfo> =
   tShape<ConnectionInfo>({
diff --git a/lib/types/thread-permission-types.js b/lib/types/thread-permission-types.js
--- a/lib/types/thread-permission-types.js
+++ b/lib/types/thread-permission-types.js
@@ -513,7 +513,7 @@
 
 export type ThreadPermissionInfo =
   | { +value: true, +source: string }
-  | { +value: false, +source: null };
+  | { +value: false, +source?: null };
 export const threadPermissionInfoValidator: TUnion<ThreadPermissionInfo> =
   t.union([
     tShape({ value: tBool(true), source: tID }),
diff --git a/lib/types/thread-types.js b/lib/types/thread-types.js
--- a/lib/types/thread-types.js
+++ b/lib/types/thread-types.js
@@ -382,7 +382,7 @@
       +type: 5,
       +sourceMessageID: string,
       ...BaseNewThreadRequest,
-      +parentThreadID: string,
+      +parentThreadID?: string,
     }>;
 
 export type ClientNewThinThreadRequest = $ReadOnly<{
diff --git a/lib/types/tunnelbroker/user-actions-peer-to-peer-message-types.js b/lib/types/tunnelbroker/user-actions-peer-to-peer-message-types.js
--- a/lib/types/tunnelbroker/user-actions-peer-to-peer-message-types.js
+++ b/lib/types/tunnelbroker/user-actions-peer-to-peer-message-types.js
@@ -57,7 +57,7 @@
   +type: 'BACKUP_DATA',
   +userID: string,
   +primaryDeviceID: string,
-  +backupData: QRAuthBackupData,
+  +backupData: ?QRAuthBackupData,
 };
 export const backupDataP2PMessageValidator: TInterface<BackupDataP2PMessage> =
   tShape<BackupDataP2PMessage>({
diff --git a/lib/utils/user-info-extraction-utils.js b/lib/utils/user-info-extraction-utils.js
--- a/lib/utils/user-info-extraction-utils.js
+++ b/lib/utils/user-info-extraction-utils.js
@@ -24,10 +24,10 @@
 };
 
 type AdditionalResponseFields = {
-  +cookieChange: AdditionalCookieChange,
+  +cookieChange?: AdditionalCookieChange,
   +error?: string,
   +payload?: Object,
-  +success: boolean,
+  +success?: boolean,
 };
 
 const additionalResponseFieldsValidator = tShape<AdditionalResponseFields>({