diff --git a/CHANGELOG.adoc b/CHANGELOG.adoc
index 9a85fb4b..c8e0d8ba 100644
--- a/CHANGELOG.adoc
+++ b/CHANGELOG.adoc
@@ -13,6 +13,10 @@ For a detailed view of what has changed, refer to the {url-repo}/commits/main[co
 
 == Unreleased
 
+Improvement::
+
+* Upgrade to asciidoctor 2.0.20 (#1209)
+
 Build / Infrastructure::
 
 * Fix Asciidoctor upstream CI tests (#1178) (@abelsromero)
@@ -37,7 +41,7 @@ Bug Fixes::
 
 Improvement::
 
-* Upgrade to asciidoctorj 2.0.18 (#1126)
+* Upgrade to asciidoctor 2.0.18 (#1126)
 * Upgrade to asciidoctorj-diagram 2.2.4 (#1140)
 * Upgrade to jruby 9.3.10.0 (#1138) (@alexlevinfr)
 
diff --git a/build.gradle b/build.gradle
index 2d8b4ed7..a14594f4 100644
--- a/build.gradle
+++ b/build.gradle
@@ -79,7 +79,7 @@ ext {
   pdfboxVersion = '1.8.16'
 
   // gem versions
-  asciidoctorGemVersion = project.hasProperty('asciidoctorGemVersion') ? project.asciidoctorGemVersion : '2.0.18'
+  asciidoctorGemVersion = project.hasProperty('asciidoctorGemVersion') ? project.asciidoctorGemVersion : '2.0.20'
   asciimathGemVersion = '2.0.4'
   coderayGemVersion = '1.1.3'
   rougeGemVersion = '3.30.0'