diff --git a/source/_common.R b/source/_common.R
index 3f41b2a4..744849d8 100644
--- a/source/_common.R
+++ b/source/_common.R
@@ -26,7 +26,7 @@ knitr::opts_chunk$set(
 options(dplyr.print_min = 6, dplyr.print_max = 6)
 
 # Book edition from notebook format in build spec
-is_py_ed <- ._spec$noteout$`nb-format` == 'ipynb'
+is_py_ed <- ._spec$processing$language == 'python'
 is_r_ed <- !is_py_ed
 
 knitr::opts_template$set(svg_fig = list(eval=TRUE, echo=FALSE,
diff --git a/source/_quarto.yml.template b/source/_quarto.yml.template
index 29b2dee6..2e30df14 100644
--- a/source/_quarto.yml.template
+++ b/source/_quarto.yml.template
@@ -96,7 +96,7 @@ noteout:
   pre-filter: ['todo', 'comment']
   filter-divspans: {filter_divspans}
   nb-flatten-divspans: {nb_flatten_divspans}
-  nb-format: Rmd
+  nb-format: {nb_format}
   nb-strip-header-nos: false
   interact-url: "/{interact-sdir}/lab/index.html?path="
   url-root: {url-root}