diff --git a/doc/src/SUMMARY.md b/doc/src/SUMMARY.md
index 01f9459dd5944..8073d12bf1f66 100644
--- a/doc/src/SUMMARY.md
+++ b/doc/src/SUMMARY.md
@@ -26,4 +26,4 @@
   - [12: Safety of `NonZero`](./challenges/0012-nonzero.md)
   - [13: Safety of `CStr`](./challenges/0013-cstr.md)
   - [14: Safety of Primitive Conversions](./challenges/0014-convert-num.md)
-  - [15: Contracts and Tests for SIMD Intrinsics](./challenges/0014-intrinsics-simd.md)
+  - [15: Contracts and Tests for SIMD Intrinsics](./challenges/0015-intrinsics-simd.md)
diff --git a/doc/src/challenges/0015-intrinsics-simd.md b/doc/src/challenges/0015-intrinsics-simd.md
index fc97ff1840e54..1fa995f85a90a 100644
--- a/doc/src/challenges/0015-intrinsics-simd.md
+++ b/doc/src/challenges/0015-intrinsics-simd.md
@@ -1,4 +1,4 @@
-# Challenge 14: Contracts and Tests for SIMD Intrinsics
+# Challenge 15: Contracts and Tests for SIMD Intrinsics
 
 - **Status:** Open
 - **Reward:**