diff --git a/keyserver/src/creators/role-creator.js b/keyserver/src/creators/role-creator.js
--- a/keyserver/src/creators/role-creator.js
+++ b/keyserver/src/creators/role-creator.js
@@ -46,7 +46,7 @@
   const time = Date.now();
   const newRows = [];
   const namesToIDs: { [string]: string } = {};
-  for (const name in rolePermissions) {
+  for (const name of Object.keys(rolePermissions)) {
     const id = ids.shift();
     namesToIDs[name] = id;
     const permissionsBlob = JSON.stringify(rolePermissions[name]);
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
@@ -224,7 +224,7 @@
   const newNotifRows = [];
   if (numRescinds > 0) {
     invariant(dbIDs, 'dbIDs should be set');
-    for (const rescindedID in deliveryResults) {
+    for (const rescindedID of Object.keys(deliveryResults)) {
       const delivery: RescindDelivery = {
         source: 'rescind',
         rescindedID,
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
@@ -10,7 +10,7 @@
 // functions.
 function createBotViewer(userID: string): Viewer {
   let userIDIsBot = false;
-  for (const botName in bots) {
+  for (const botName of Object.keys(bots)) {
     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
@@ -79,7 +79,7 @@
     const directedDeleteIDs = [];
     const messageDatas = [];
     const now = Date.now();
-    for (const userID in userRelationshipOperations) {
+    for (const userID of Object.keys(userRelationshipOperations)) {
       const operations = userRelationshipOperations[userID];
       const ids = sortUserIDs(viewer.userID, userID);
 
diff --git a/lib/permissions/prefixes.js b/lib/permissions/prefixes.js
--- a/lib/permissions/prefixes.js
+++ b/lib/permissions/prefixes.js
@@ -25,7 +25,7 @@
   let remainingString = threadPermissionString;
 
   let propagationPrefix;
-  for (const key in threadPermissionPropagationPrefixes) {
+  for (const key of Object.keys(threadPermissionPropagationPrefixes)) {
     const prefix = threadPermissionPropagationPrefixes[key];
     if (!remainingString.startsWith(prefix)) {
       continue;
@@ -36,7 +36,7 @@
   }
 
   let filterPrefix;
-  for (const key in threadPermissionFilterPrefixes) {
+  for (const key of Object.keys(threadPermissionFilterPrefixes)) {
     const prefix = threadPermissionFilterPrefixes[key];
     if (!remainingString.startsWith(prefix)) {
       continue;
@@ -47,7 +47,7 @@
   }
 
   let membershipPrefix;
-  for (const key in threadPermissionMembershipPrefixes) {
+  for (const key of Object.keys(threadPermissionMembershipPrefixes)) {
     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
@@ -45,7 +45,7 @@
   threadID: string,
 ): ThreadPermissionsInfo {
   const result: { [permission: ThreadPermission]: ThreadPermissionInfo } = {};
-  for (const permissionName in threadPermissions) {
+  for (const permissionName of Object.keys(threadPermissions)) {
     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
@@ -22,7 +22,7 @@
 import { updateTypes } from '../../types/update-types-enum.js';
 import type { ClientUpdateInfo } from '../../types/update-types.js';
 import { blobHashFromBlobServiceURI } from '../../utils/blob-service.js';
-import { values } from '../../utils/objects.js';
+import { values, entries } from '../../utils/objects.js';
 import { rawMessageInfoFromMessageData } from '../message-utils.js';
 
 function getThreadIDFromChangeThreadSettingsDMOp(
@@ -87,8 +87,7 @@
     normalizedThreadInfoUpdate = { ...rest };
   }
 
-  for (const fieldName in normalizedThreadInfoUpdate) {
-    const value = normalizedThreadInfoUpdate[fieldName];
+  for (const [fieldName, value] of entries(normalizedThreadInfoUpdate)) {
     const messageData: ChangeSettingsMessageData = {
       type: messageTypes.CHANGE_SETTINGS,
       threadID,
@@ -156,7 +155,7 @@
       );
 
       let threadInfoToUpdate: ThickRawThreadInfo = threadInfo;
-      for (const fieldName in threadInfoUpdate) {
+      for (const fieldName of Object.keys(threadInfoUpdate)) {
         const timestamp = threadInfoToUpdate.timestamps[fieldName];
         if (timestamp < time) {
           threadInfoToUpdate = {
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
@@ -12,7 +12,7 @@
   if (staff.includes(userID)) {
     return true;
   }
-  for (const key in bots) {
+  for (const key of Object.keys(bots)) {
     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) {
+  for (const validatorMessageTypeName of Object.keys(messageTypes)) {
     const validatorMessageType = messageTypes[validatorMessageTypeName];
     const validator = messageSpecs[validatorMessageType].validator;
 
@@ -860,7 +860,7 @@
       apiResponseServerSocketMessageValidator,
   };
 
-  for (const validatorMessageType in validatorByMessageType) {
+  for (const validatorMessageType of Object.keys(validatorByMessageType)) {
     const validator = validatorByMessageType[validatorMessageType];
     const validatorMessageTypeName = _findKey(
       e => e === Number(validatorMessageType),
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
@@ -50,7 +50,7 @@
 
   possiblyRunCommands() {
     let openSlots: { [string]: number } = {};
-    for (const type in this.currentCalls) {
+    for (const type of Object.keys(this.currentCalls)) {
       const currentCalls = this.currentCalls[type];
       const maxCalls = maxSimultaneousCalls[type];
       const callsLeft = maxCalls - currentCalls;
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
@@ -94,7 +94,7 @@
         rotated: updates.width > updates.height === defaultIsPortrait,
       };
     }
-    for (const key in updates) {
+    for (const key of Object.keys(updates)) {
       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
@@ -5,6 +5,7 @@
 import { createSelector } from 'reselect';
 
 import type { GlobalTheme } from 'lib/types/theme-types.js';
+import { entries } from 'lib/utils/objects.js';
 
 import { selectBackgroundIsDark } from '../navigation/nav-selectors.js';
 import { NavContext } from '../navigation/navigation-context.js';
@@ -389,7 +390,7 @@
 );
 
 const magicStrings = new Set<string>();
-for (const theme in colors) {
+for (const theme of Object.keys(colors)) {
   for (const magicString in colors[theme]) {
     magicStrings.add(magicString);
   }
@@ -407,8 +408,7 @@
   for (const key in obj) {
     const style = obj[key];
     const filledInStyle = { ...style };
-    for (const styleKey in style) {
-      const styleValue = style[styleKey];
+    for (const [styleKey, styleValue] of entries(style)) {
       if (typeof styleValue !== 'string') {
         continue;
       }
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) {
+  for (const messageName of Object.keys(messageTypes)) {
     const messageType = messageTypes[messageName];
     if (
       messageSpecs[messageType]?.getMessageNotifyType &&