diff --git a/src/common/Input.js b/src/common/Input.js
index 1d145514f3e..d3c51acdcc5 100644
--- a/src/common/Input.js
+++ b/src/common/Input.js
@@ -8,10 +8,10 @@ import type { ThemeData } from '../styles';
 import { ThemeContext, HALF_COLOR, BORDER_COLOR } from '../styles';
 
 export type Props = $ReadOnly<{|
-  // TextInput's definition changes across the RN v0.61 -> v0.62
-  // upgrade; we'll handle that change after the upgrade.
+  // Should be fixed in RN v0.63 (#4245); see
+  // https://github.com/zulip/zulip-mobile/issues/4245#issuecomment-695104351.
   // $FlowFixMe
-  ...$PropertyType<TextInput, 'props'>,
+  ...$PropertyType<typeof TextInput, 'props'>,
   placeholder: LocalizableText,
   onChangeText?: (text: string) => void,
   textInputRef?: React$Ref<typeof TextInput>,
diff --git a/src/common/InputWithClearButton.js b/src/common/InputWithClearButton.js
index e5b332964d0..79a5a38904e 100644
--- a/src/common/InputWithClearButton.js
+++ b/src/common/InputWithClearButton.js
@@ -32,10 +32,7 @@ export default class InputWithClearButton extends PureComponent<Props, State> {
     canBeCleared: false,
     text: '',
   };
-  // TextInput's definition changes across the RN v0.61 -> v0.62
-  // upgrade; we'll handle that change after the upgrade.
-  // $FlowFixMe
-  textInputRef = React.createRef<TextInput>();
+  textInputRef = React.createRef<typeof TextInput>();
 
   handleChangeText = (text: string) => {
     this.setState({
@@ -50,6 +47,9 @@ export default class InputWithClearButton extends PureComponent<Props, State> {
   handleClear = () => {
     this.handleChangeText('');
     if (this.textInputRef.current) {
+      // Should be fixed in RN v0.63 (#4245); see
+      // https://github.com/zulip/zulip-mobile/issues/4245#issuecomment-695104351.
+      // $FlowFixMe
       this.textInputRef.current.clear();
     }
   };
diff --git a/src/common/SmartUrlInput.js b/src/common/SmartUrlInput.js
index 7ea87705070..95650656da2 100644
--- a/src/common/SmartUrlInput.js
+++ b/src/common/SmartUrlInput.js
@@ -66,15 +66,15 @@ export default class SmartUrlInput extends PureComponent<Props, State> {
   state = {
     value: '',
   };
-  // TextInput's definition changes across the RN v0.61 -> v0.62
-  // upgrade; we'll handle that change after the upgrade.
-  // $FlowFixMe
-  textInputRef = React.createRef<TextInput>();
+  textInputRef = React.createRef<typeof TextInput>();
   focusListener: void | NavigationEventSubscription;
 
   componentDidMount() {
     this.focusListener = this.props.navigation.addListener('didFocus', () => {
       if (this.textInputRef.current) {
+        // Should be fixed in RN v0.63 (#4245); see
+        // https://github.com/zulip/zulip-mobile/issues/4245#issuecomment-695104351.
+        // $FlowFixMe
         this.textInputRef.current.focus();
       }
     });
@@ -96,9 +96,13 @@ export default class SmartUrlInput extends PureComponent<Props, State> {
   urlPress = () => {
     const { textInputRef } = this;
     if (textInputRef.current) {
+      // Should be fixed in RN v0.63 (#4245); see
+      // https://github.com/zulip/zulip-mobile/issues/4245#issuecomment-695104351.
+      // $FlowFixMe
       textInputRef.current.blur();
       setTimeout(() => {
         if (textInputRef.current) {
+          // $FlowFixMe - same as above
           textInputRef.current.focus();
         }
       }, 100);
diff --git a/src/compose/ComposeBox.js b/src/compose/ComposeBox.js
index 469bf1d9f1a..63321aa8b05 100644
--- a/src/compose/ComposeBox.js
+++ b/src/compose/ComposeBox.js
@@ -106,16 +106,16 @@ function randomInt(min, max) {
   return Math.floor(Math.random() * (max - min + 1)) + min;
 }
 
-// TextInput's definition changes across the RN v0.61 -> v0.62
-// upgrade; we'll handle that change after the upgrade.
-// $FlowFixMe
-export const updateTextInput = (textInput: TextInput | null, text: string): void => {
+export const updateTextInput = (textInput: typeof TextInput | null, text: string): void => {
   if (textInput === null) {
     // Depending on the lifecycle events this function is called from,
     // this might not be set yet.
     return;
   }
 
+  // Should be fixed in RN v0.63 (#4245); see
+  // https://github.com/zulip/zulip-mobile/issues/4245#issuecomment-695104351.
+  // $FlowFixMe
   textInput.setNativeProps({ text });
 
   if (text.length === 0 && TextInputReset) {
@@ -129,12 +129,8 @@ class ComposeBox extends PureComponent<Props, State> {
   static contextType = ThemeContext;
   context: ThemeData;
 
-  // TextInput's definition changes across the RN v0.61 -> v0.62
-  // upgrade; we'll remove these fixmes after we take that upgrade.
-  // $FlowFixMe
-  messageInputRef = React.createRef<TextInput>();
-  // $FlowFixMe
-  topicInputRef = React.createRef<TextInput>();
+  messageInputRef = React.createRef<typeof TextInput>();
+  topicInputRef = React.createRef<typeof TextInput>();
 
   // TODO: Type-check this, once we've adjusted our `react-redux`
   // wrapper to do the right thing. It should be
@@ -350,6 +346,9 @@ class ComposeBox extends PureComponent<Props, State> {
     }
     completeEditMessage();
     if (this.messageInputRef.current !== null) {
+      // Should be fixed in RN v0.63 (#4245); see
+      // https://github.com/zulip/zulip-mobile/issues/4245#issuecomment-695104351.
+      // $FlowFixMe
       this.messageInputRef.current.blur();
     }
   };
@@ -364,6 +363,9 @@ class ComposeBox extends PureComponent<Props, State> {
       this.setMessageInputValue(message);
       this.setTopicInputValue(topic);
       if (this.messageInputRef.current !== null) {
+        // Should be fixed in RN v0.63 (#4245); see
+        // https://github.com/zulip/zulip-mobile/issues/4245#issuecomment-695104351.
+        // $FlowFixMe
         this.messageInputRef.current.focus();
       }
     }