diff --git a/lectures/templates_and_headers.md b/lectures/templates_and_headers.md
index 8ea7082..8742bd7 100644
--- a/lectures/templates_and_headers.md
+++ b/lectures/templates_and_headers.md
@@ -3,7 +3,7 @@
 ----
 
 <p align="center">
-  <a href="https://youtu.be/blah"><img src="https://img.youtube.com/vi/blah/maxresdefault.jpg" alt="Video" align="right" width=50% style="margin: 0.5rem"></a>
+  <a href="https://youtu.be/vjsr18XXMMQ"><img src="https://img.youtube.com/vi/vjsr18XXMMQ/maxresdefault.jpg" alt="Video" align="right" width=50% style="margin: 0.5rem"></a>
 </p>
 
 - [Why linker fails](#why-linker-fails)
diff --git a/readme.md b/readme.md
index 8ba2d81..c2a4e57 100644
--- a/readme.md
+++ b/readme.md
@@ -573,7 +573,7 @@ Headers with classes
 <summary>Header and source files for templated code</summary>
 
 ----------------------------------------------------------
-[![Video thumbnail](https://img.youtube.com/vi/blah/maxresdefault.jpg)](https://youtu.be/blah)
+[![Video thumbnail](https://img.youtube.com/vi/vjsr18XXMMQ/maxresdefault.jpg)](https://youtu.be/vjsr18XXMMQ)
 
 - [Why linker fails](lectures/templates_and_headers.md#why-linker-fails)
   - [Compilation process for single `main.cpp` file](lectures/templates_and_headers.md#compilation-process-for-single-maincpp-file)