diff --git a/keyserver/src/push/rescind.js b/keyserver/src/push/rescind.js
--- a/keyserver/src/push/rescind.js
+++ b/keyserver/src/push/rescind.js
@@ -234,6 +234,7 @@
         delivery.errors = errors;
       }
       const dbID = dbIDs.shift();
+      // $FlowFixMe
       const { userID, threadID, messageID } = notifInfo[rescindedID];
       newNotifRows.push([
         dbID,
diff --git a/keyserver/src/session/bots.js b/keyserver/src/session/bots.js
--- a/keyserver/src/session/bots.js
+++ b/keyserver/src/session/bots.js
@@ -11,6 +11,7 @@
 function createBotViewer(userID: string): Viewer {
   let userIDIsBot = false;
   for (const botName in bots) {
+    // $FlowFixMe
     if (bots[botName].userID === userID) {
       userIDIsBot = true;
       break;
diff --git a/keyserver/src/updaters/relationship-updaters.js b/keyserver/src/updaters/relationship-updaters.js
--- a/keyserver/src/updaters/relationship-updaters.js
+++ b/keyserver/src/updaters/relationship-updaters.js
@@ -97,6 +97,7 @@
           if (request.users[userID].createRobotextInThinThread) {
             messageDatas.push({
               type: messageTypes.LEGACY_UPDATE_RELATIONSHIP,
+              // $FlowFixMe
               threadID: threadIDPerUser[userID],
               creatorID: viewer.userID,
               targetID: userID,
@@ -110,6 +111,7 @@
           if (request.users[userID].createRobotextInThinThread) {
             messageDatas.push({
               type: messageTypes.LEGACY_UPDATE_RELATIONSHIP,
+              // $FlowFixMe
               threadID: threadIDPerUser[userID],
               creatorID: viewer.userID,
               targetID: userID,
diff --git a/lib/permissions/prefixes.js b/lib/permissions/prefixes.js
--- a/lib/permissions/prefixes.js
+++ b/lib/permissions/prefixes.js
@@ -26,6 +26,7 @@
 
   let propagationPrefix;
   for (const key in threadPermissionPropagationPrefixes) {
+    // $FlowFixMe
     const prefix = threadPermissionPropagationPrefixes[key];
     if (!remainingString.startsWith(prefix)) {
       continue;
@@ -37,6 +38,7 @@
 
   let filterPrefix;
   for (const key in threadPermissionFilterPrefixes) {
+    // $FlowFixMe
     const prefix = threadPermissionFilterPrefixes[key];
     if (!remainingString.startsWith(prefix)) {
       continue;
@@ -48,6 +50,7 @@
 
   let membershipPrefix;
   for (const key in threadPermissionMembershipPrefixes) {
+    // $FlowFixMe
     const prefix = threadPermissionMembershipPrefixes[key];
     if (!remainingString.startsWith(prefix)) {
       continue;
diff --git a/lib/permissions/thread-permissions.js b/lib/permissions/thread-permissions.js
--- a/lib/permissions/thread-permissions.js
+++ b/lib/permissions/thread-permissions.js
@@ -46,6 +46,7 @@
 ): ThreadPermissionsInfo {
   const result: { [permission: ThreadPermission]: ThreadPermissionInfo } = {};
   for (const permissionName in threadPermissions) {
+    // $FlowFixMe
     const permissionKey = threadPermissions[permissionName];
     const permission = permissionLookup(permissions, permissionKey);
     let entry: ThreadPermissionInfo = { value: false, source: null };
diff --git a/lib/shared/dm-ops/change-thread-settings-spec.js b/lib/shared/dm-ops/change-thread-settings-spec.js
--- a/lib/shared/dm-ops/change-thread-settings-spec.js
+++ b/lib/shared/dm-ops/change-thread-settings-spec.js
@@ -87,7 +87,7 @@
     normalizedThreadInfoUpdate = { ...rest };
   }
 
-  for (const fieldName in normalizedThreadInfoUpdate) {
+  Object.keys(normalizedThreadInfoUpdate).forEach(fieldName => {
     const value = normalizedThreadInfoUpdate[fieldName];
     const messageData: ChangeSettingsMessageData = {
       type: messageTypes.CHANGE_SETTINGS,
@@ -102,7 +102,7 @@
       `${messageIDsPrefix}/${fieldName}`,
     );
     fieldNameToMessageData[fieldName] = { messageData, rawMessageInfo };
-  }
+  });
 
   return { fieldNameToMessageData, threadInfoUpdate };
 }
@@ -156,7 +156,7 @@
       );
 
       let threadInfoToUpdate: ThickRawThreadInfo = threadInfo;
-      for (const fieldName in threadInfoUpdate) {
+      Object.keys(threadInfoUpdate).forEach(fieldName => {
         const timestamp = threadInfoToUpdate.timestamps[fieldName];
         if (timestamp < time) {
           threadInfoToUpdate = {
@@ -168,7 +168,7 @@
             },
           };
         }
-      }
+      });
 
       if (messageDataWithMessageInfoPairs.length > 0) {
         updateInfos.push({
diff --git a/lib/shared/staff-utils.js b/lib/shared/staff-utils.js
--- a/lib/shared/staff-utils.js
+++ b/lib/shared/staff-utils.js
@@ -13,6 +13,7 @@
     return true;
   }
   for (const key in bots) {
+    // $FlowFixMe
     const bot = bots[key];
     if (userID === bot.userID) {
       return true;
diff --git a/lib/types/validation.test.js b/lib/types/validation.test.js
--- a/lib/types/validation.test.js
+++ b/lib/types/validation.test.js
@@ -318,7 +318,7 @@
 ];
 
 describe('message validation', () => {
-  for (const validatorMessageTypeName in messageTypes) {
+  Object.keys(messageTypes).forEach(validatorMessageTypeName => {
     const validatorMessageType = messageTypes[validatorMessageTypeName];
     const validator = messageSpecs[validatorMessageType].validator;
 
@@ -346,7 +346,7 @@
         });
       }
     }
-  }
+  });
 });
 
 const thread = {
@@ -860,7 +860,7 @@
       apiResponseServerSocketMessageValidator,
   };
 
-  for (const validatorMessageType in validatorByMessageType) {
+  Object.keys(validatorByMessageType).forEach(validatorMessageType => {
     const validator = validatorByMessageType[validatorMessageType];
     const validatorMessageTypeName = _findKey(
       e => e === Number(validatorMessageType),
@@ -881,5 +881,5 @@
         });
       }
     }
-  }
+  });
 });
diff --git a/native/media/media-processing-queue.js b/native/media/media-processing-queue.js
--- a/native/media/media-processing-queue.js
+++ b/native/media/media-processing-queue.js
@@ -51,7 +51,9 @@
   possiblyRunCommands() {
     let openSlots: { [string]: number } = {};
     for (const type in this.currentCalls) {
+      // $FlowFixMe
       const currentCalls = this.currentCalls[type];
+      // $FlowFixMe
       const maxCalls = maxSimultaneousCalls[type];
       const callsLeft = maxCalls - currentCalls;
       if (!callsLeft) {
diff --git a/native/redux/dimensions-updater.react.js b/native/redux/dimensions-updater.react.js
--- a/native/redux/dimensions-updater.react.js
+++ b/native/redux/dimensions-updater.react.js
@@ -95,6 +95,7 @@
       };
     }
     for (const key in updates) {
+      // $FlowFixMe
       if (updates[key] === dimensions[key]) {
         continue;
       }
diff --git a/native/themes/colors.js b/native/themes/colors.js
--- a/native/themes/colors.js
+++ b/native/themes/colors.js
@@ -389,11 +389,11 @@
 );
 
 const magicStrings = new Set<string>();
-for (const theme in colors) {
+Object.keys(colors).forEach(theme => {
   for (const magicString in colors[theme]) {
     magicStrings.add(magicString);
   }
-}
+});
 
 type Styles = { [name: string]: { +[field: string]: any } };
 
@@ -413,6 +413,7 @@
         continue;
       }
       if (magicStrings.has(styleValue)) {
+        // $FlowFixMe
         const mapped = themeColors[styleValue];
         if (mapped) {
           filledInStyle[styleKey] = mapped;
diff --git a/native/types/message-types-validator.js b/native/types/message-types-validator.js
--- a/native/types/message-types-validator.js
+++ b/native/types/message-types-validator.js
@@ -9,7 +9,7 @@
 if (__DEV__) {
   const messageTypesCpp = new Set(commConstants.NATIVE_MESSAGE_TYPES);
   const missingMessageTypesCpp = [];
-  for (const messageName in messageTypes) {
+  Object.keys(messageTypes).forEach(messageName => {
     const messageType = messageTypes[messageName];
     if (
       messageSpecs[messageType]?.getMessageNotifyType &&
@@ -17,7 +17,7 @@
     ) {
       missingMessageTypesCpp.push(messageName);
     }
-  }
+  });
 
   if (missingMessageTypesCpp.length !== 0) {
     Alert.alert(