diff --git a/CHANGELOG.md b/CHANGELOG.md
index 06a77cc8..da4aef7d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,11 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+### [1.0.4] 2021-07-10
+
+Fix #3: Path to the example css for the layers control
+Fix #4: More tsc `strict: true` mode compatibility fixes for React 17
+
 ### [1.0.3] 2021-06-24
 
 Fix #2: Support importing from tsc with `strict: true`
diff --git a/src/REvent.tsx b/src/REvent.tsx
index a8aa4c05..5b4cd794 100644
--- a/src/REvent.tsx
+++ b/src/REvent.tsx
@@ -62,7 +62,7 @@ export class RlayersBase<P, S> extends React.PureComponent<P, S> {
         return false;
     }
 
-    componentDidUpdate(prevProps: P, prev: null, snap: unknown): void {
+    componentDidUpdate(prevProps: Readonly<P>, prev: Readonly<unknown>, snap: unknown): void {
         if (this.props !== prevProps) {
             debug('willRefresh', this, prevProps, this.props);
             this.refresh(prevProps);
diff --git a/src/style/RBase.tsx b/src/style/RBase.tsx
index e7da46b6..db0508f2 100644
--- a/src/style/RBase.tsx
+++ b/src/style/RBase.tsx
@@ -56,7 +56,11 @@ export default class RBase<P extends RBaseProps> extends React.PureComponent<
         this.set(this.ol);
     }
 
-    componentDidUpdate(prevProps: P, prevState: null, snapshot: unknown): void {
+    componentDidUpdate(
+        prevProps: Readonly<P>,
+        prevState: Readonly<unknown>,
+        snapshot: unknown
+    ): void {
         if (prevProps !== this.props) this.refresh(prevProps);
     }