diff --git a/types/react-reconciler/ReactFiber.d.ts b/types/react-reconciler/ReactFiber.d.ts
index 5e6eb448ac..6ea29c798b 100644
--- a/types/react-reconciler/ReactFiber.d.ts
+++ b/types/react-reconciler/ReactFiber.d.ts
@@ -51,7 +51,7 @@ export interface Fiber {
 
     // The ref last used to attach this node.
     // I'll avoid adding an owner field for prod and model that as functions.
-    ref: null | (((handle: unknown) => void) & { _stringRef: string | null | undefined }) | RefObject;
+    ref: null | (((handle: any) => void) & { _stringRef: string | null | undefined }) | RefObject;
 
     // Input is the data coming into process this fiber. Arguments. Props.
     pendingProps: any; // This type will be more specific once we overload the tag.
@@ -64,7 +64,7 @@ export interface Fiber {
     memoizedState: any;
 
     // A linked-list of contexts that this fiber depends on
-    firstContextDependency: ContextDependency<unknown> | null;
+    firstContextDependency: ContextDependency<any> | null;
 
     // Bitfield that describes properties about the fiber and its subtree. E.g.
     // the AsyncMode flag indicates whether the subtree should be async-by-
diff --git a/types/react-reconciler/ReactFiberNewContext.d.ts b/types/react-reconciler/ReactFiberNewContext.d.ts
index 88abd8f8bb..a212df9839 100644
--- a/types/react-reconciler/ReactFiberNewContext.d.ts
+++ b/types/react-reconciler/ReactFiberNewContext.d.ts
@@ -3,5 +3,5 @@ import { ReactContext } from './ReactTypes';
 export interface ContextDependency<T> {
     context: ReactContext<T>;
     observedBits: number;
-    next: ContextDependency<unknown> | null;
+    next: ContextDependency<any> | null;
 }
diff --git a/types/react-reconciler/ReactFiberReconciler.d.ts b/types/react-reconciler/ReactFiberReconciler.d.ts
index 9b760a4cc6..ca2296bfa4 100644
--- a/types/react-reconciler/ReactFiberReconciler.d.ts
+++ b/types/react-reconciler/ReactFiberReconciler.d.ts
@@ -240,7 +240,7 @@ export interface Reconciler<Instance, TextInstance, Container, PublicInstance> {
     ): R;
     interactiveUpdates<A, B, R>(fn: (a: A, b: B) => R, a: A, b: B): R;
     flushInteractiveUpdates(): void;
-    flushControlled(fn: () => unknown): void;
+    flushControlled(fn: () => any): void;
     flushSync<A, R>(fn: (a: A) => R, a: A): R;
 
     // Used to extract the return value from the initial render. Legacy API.
diff --git a/types/react-reconciler/ReactFiberRoot.d.ts b/types/react-reconciler/ReactFiberRoot.d.ts
index 64ab2328cc..0117eb9d51 100644
--- a/types/react-reconciler/ReactFiberRoot.d.ts
+++ b/types/react-reconciler/ReactFiberRoot.d.ts
@@ -6,7 +6,7 @@ import { Interaction } from './Tracking';
 export interface Batch {
     _defer: boolean;
     _expirationTime: ExpirationTime;
-    _onComplete: () => unknown;
+    _onComplete: () => any;
     _next: Batch | null;
 }
 
diff --git a/types/react-reconciler/ReactUpdateQueue.d.ts b/types/react-reconciler/ReactUpdateQueue.d.ts
index ec3381a410..497ce9f0f6 100644
--- a/types/react-reconciler/ReactUpdateQueue.d.ts
+++ b/types/react-reconciler/ReactUpdateQueue.d.ts
@@ -5,7 +5,7 @@ export interface Update<State> {
 
     tag: 0 | 1 | 2 | 3;
     payload: any;
-    callback: (() => unknown) | null;
+    callback: (() => any) | null;
 
     next: Update<State> | null;
     nextEffect: Update<State> | null;
diff --git a/types/react-reconciler/index.d.ts b/types/react-reconciler/index.d.ts
index bb1efeaead..109f243a88 100644
--- a/types/react-reconciler/index.d.ts
+++ b/types/react-reconciler/index.d.ts
@@ -2,7 +2,7 @@
 // Project: https://reactjs.org/
 // Definitions by: Nathan Bierema <https://github.com/Methuselah96>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
-// TypeScript Version: 3.0
+// TypeScript Version: 2.8
 
 export { default } from './ReactFiberReconciler';
 
diff --git a/types/react-reconciler/test/ReactTestRendererScheduling.ts b/types/react-reconciler/test/ReactTestRendererScheduling.ts
index d1a91789ac..a080c01391 100644
--- a/types/react-reconciler/test/ReactTestRendererScheduling.ts
+++ b/types/react-reconciler/test/ReactTestRendererScheduling.ts
@@ -5,11 +5,11 @@ interface Deadline {
 
 // Current virtual time
 export let nowImplementation = () => 0;
-export let scheduledCallback: ((deadline: Deadline) => unknown) | null = null;
-export let yieldedValues: Array<unknown> = [];
+export let scheduledCallback: ((deadline: Deadline) => any) | null = null;
+export let yieldedValues: Array<any> = [];
 
 export function scheduleDeferredCallback(
-    callback: (deadline: Deadline) => unknown,
+    callback: (deadline: Deadline) => any,
     options?: { timeout: number },
 ): number {
     scheduledCallback = callback;
@@ -25,7 +25,7 @@ export function setNowImplementation(implementation: () => number): void {
     nowImplementation = implementation;
 }
 
-export function flushAll(): Array<unknown> {
+export function flushAll(): Array<any> {
     yieldedValues = [];
     while (scheduledCallback !== null) {
         const cb = scheduledCallback;
@@ -44,7 +44,7 @@ export function flushAll(): Array<unknown> {
     return yieldedValues;
 }
 
-export function flushNumberOfYields(count: number): Array<unknown> {
+export function flushNumberOfYields(count: number): Array<any> {
     let didStop = false;
     yieldedValues = [];
     while (scheduledCallback !== null && !didStop) {
@@ -69,11 +69,11 @@ export function flushNumberOfYields(count: number): Array<unknown> {
     return yieldedValues;
 }
 
-export function yieldValue(value: unknown): void {
+export function yieldValue(value: any): void {
     yieldedValues.push(value);
 }
 
-export function clearYields(): Array<unknown> {
+export function clearYields(): Array<any> {
     const values = yieldedValues;
     yieldedValues = [];
     return values;