diff --git a/package.json b/package.json
index f3f7c603..a8e4b867 100644
--- a/package.json
+++ b/package.json
@@ -28,9 +28,9 @@
         "@types/file-saver": "^2.0.5",
         "@types/jest": "^29.5.5",
         "@types/node": "^18.17.17",
-        "@types/react": "^18.2.21",
+        "@types/react": "^18.2.37",
         "@types/react-dom": "^18.2.7",
-        "@types/react-splitter-layout": "^3.0.2",
+        "@types/react-splitter-layout": "^3.0.5",
         "@types/react-transition-group": "^4.4.7",
         "@types/redux-logger": "^3.0.10",
         "@types/semver": "^7.5.3",
diff --git a/src/react-splitter-layout.d.ts b/src/react-splitter-layout.d.ts
new file mode 100644
index 00000000..08d8a9df
--- /dev/null
+++ b/src/react-splitter-layout.d.ts
@@ -0,0 +1,6 @@
+// SPDX-License-Identifier: MIT
+// Copyright (c) 2023 The Pybricks Authors
+
+declare module 'react-splitter-layout' {
+    export = class SplitterLayout extends React.PureComponent<SplitterLayoutProps> {};
+}
diff --git a/yarn.lock b/yarn.lock
index 9a209443..2323e489 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -2659,9 +2659,9 @@ __metadata:
     "@types/file-saver": ^2.0.5
     "@types/jest": ^29.5.5
     "@types/node": ^18.17.17
-    "@types/react": ^18.2.21
+    "@types/react": ^18.2.37
     "@types/react-dom": ^18.2.7
-    "@types/react-splitter-layout": ^3.0.2
+    "@types/react-splitter-layout": ^3.0.5
     "@types/react-transition-group": ^4.4.7
     "@types/redux-logger": ^3.0.10
     "@types/semver": ^7.5.3
@@ -4973,12 +4973,12 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@types/react-splitter-layout@npm:^3.0.2":
-  version: 3.0.2
-  resolution: "@types/react-splitter-layout@npm:3.0.2"
+"@types/react-splitter-layout@npm:^3.0.5":
+  version: 3.0.5
+  resolution: "@types/react-splitter-layout@npm:3.0.5"
   dependencies:
     "@types/react": "*"
-  checksum: 7fa9c0840f848c12678d79c0966d6dd20a89c04509b4b0daf8e366668524d3c629ee259e5c15669d061b786569d85246081d0ee7bf83242e2667c1a3ecbcbd1e
+  checksum: 9c8e9cc7ac568a3f5c7a1237725ce084d4c0747f91f7da359b9d5bf2439b33c99f3b90223443854d9602af84a1fad1ffe159ac0a2b77d4a42588e17044c136ec
   languageName: node
   linkType: hard
 
@@ -4991,7 +4991,7 @@ __metadata:
   languageName: node
   linkType: hard
 
-"@types/react@npm:*, @types/react@npm:^18.2.21":
+"@types/react@npm:*":
   version: 18.2.21
   resolution: "@types/react@npm:18.2.21"
   dependencies:
@@ -5002,6 +5002,17 @@ __metadata:
   languageName: node
   linkType: hard
 
+"@types/react@npm:^18.2.37":
+  version: 18.2.37
+  resolution: "@types/react@npm:18.2.37"
+  dependencies:
+    "@types/prop-types": "*"
+    "@types/scheduler": "*"
+    csstype: ^3.0.2
+  checksum: 2d2599f1a09e4f678509161fea8baeaf76d21deee460f4f3ccc1ca431ebe85f896d7d0b906127de17e97ed57240cec61955eb97d0b5d9cbf4e97fd6620b1acdb
+  languageName: node
+  linkType: hard
+
 "@types/redux-logger@npm:^3.0.10":
   version: 3.0.10
   resolution: "@types/redux-logger@npm:3.0.10"