diff --git a/sessions/Makefile b/sessions/Makefile
index 67df7f0..19833f4 100644
--- a/sessions/Makefile
+++ b/sessions/Makefile
@@ -1,4 +1,4 @@
-all: python-12.pdf
+all: python-13.pdf
 
 %.pdf: %.md
 	pandoc -t beamer $< -o $@