diff --git a/part-2/containers/index.md b/part-2/containers/index.md
index 20b869a..0e41791 100644
--- a/part-2/containers/index.md
+++ b/part-2/containers/index.md
@@ -11,7 +11,7 @@ has_toc: false
 
 ## [10.1 Slides](https://a3s.fi/CSC_training/10_singularity.html)
 
-## 10.3 Tutorials and exercises
+## 10.2 Tutorials and exercises
 
 1. [Essential tutorial - Introduction to Apptainer]({{ site.baseurl }}{% link part-2/containers/apptainer-tutorial-part1.md %})
 2. [Tutorial - Apptainer introduction continued]({{ site.baseurl }}{% link part-2/containers/apptainer-tutorial-part2.md %})
diff --git a/part-2/installing/index.md b/part-2/installing/index.md
index 0e5da31..88fdd4a 100644
--- a/part-2/installing/index.md
+++ b/part-2/installing/index.md
@@ -11,7 +11,7 @@ has_toc: false
 
 ## [9.1 Slides](https://a3s.fi/CSC_training/09_installing.html)
 
-## 9.3 Tutorials and exercises
+## 9.2 Tutorials and exercises
 
 1. [Essential tutorial - Installing binary applications]({{ site.baseurl }}{% link part-2/installing/binary.md %})
 2. [Essential tutorial - Installing Python packages and environments]({{ site.baseurl }}{% link part-2/installing/python.md %})