diff --git a/progress.md b/progress.md
index 2b28aea..d754003 100644
--- a/progress.md
+++ b/progress.md
@@ -30,7 +30,7 @@
  - [x] 4.2 Slices
  - [x] 4.3 Maps
  - [x] 4.4 Structs
- - [ ] 4.5 JSON
+ - [x] 4.5 JSON
  - [ ] 4.6 Text and HTML Templates
 - [ ] Chapter 5: Functions
  - [ ] 5.1 Function Declarations