diff --git a/progress.md b/progress.md
index 4e72125..ff3353a 100644
--- a/progress.md
+++ b/progress.md
@@ -28,7 +28,7 @@
 - [x] Chapter 4: Composite Types
  - [x] 4.1 Arrays
  - [x] 4.2 Slices
- - [ ] 4.3 Maps
+ - [x] 4.3 Maps
  - [ ] 4.4 Structs
  - [ ] 4.5 JSON
  - [ ] 4.6 Text and HTML Templates