diff --git a/.github/workflows/install_dependencies_releasenotes_ubuntu.sh b/.github/workflows/install_dependencies_releasenotes_ubuntu.sh
index 8d150f210..c3a16dbd1 100755
--- a/.github/workflows/install_dependencies_releasenotes_ubuntu.sh
+++ b/.github/workflows/install_dependencies_releasenotes_ubuntu.sh
@@ -4,3 +4,6 @@ apt-get update
 apt-get install -y \
   asciidoctor \
   ruby-asciidoctor-pdf
+
+# Update asciidoctor-pdf to the latest version
+gem install asciidoctor-pdf
diff --git a/release/Makefile b/release/Makefile
index c2414e19d..d4ff31457 100644
--- a/release/Makefile
+++ b/release/Makefile
@@ -67,7 +67,7 @@ ReleaseNotes.html: ReleaseNotes.adoc
 	asciidoctor ReleaseNotes.adoc
 
 ReleaseNotes.pdf: ReleaseNotes.adoc
-	asciidoctor-pdf ReleaseNotes.adoc
+	asciidoctor-pdf --theme=default-with-font-fallbacks ReleaseNotes.adoc
 
 # -----