diff --git a/book/source/conf.py b/book/source/conf.py
index db227e5..96f5eb4 100644
--- a/book/source/conf.py
+++ b/book/source/conf.py
@@ -46,3 +46,8 @@ html_theme_options = {
 # we want to circumvent obscure warnings about footnotes following a heading:
 # https://github.com/executablebooks/MyST-Parser/issues/352
 myst_footnote_transition = False
+
+# number code-blocks, figures and tables, if they have a caption
+numfig = True
+# number figures in flat hierarchy
+numfig_secnum_depth = 0