diff --git a/Gemfile b/Gemfile
index a51b4423d60..4ec4f5f80fe 100644
--- a/Gemfile
+++ b/Gemfile
@@ -147,7 +147,7 @@ gem 'org-ruby', '~> 0.9.12'
 gem 'creole', '~> 0.5.0'
 gem 'wikicloth', '0.8.1'
 gem 'asciidoctor', '~> 1.5.6'
-gem 'asciidoctor-plantuml', '0.0.7'
+gem 'asciidoctor-plantuml', '0.0.8'
 gem 'rouge', '~> 2.0'
 gem 'truncato', '~> 0.7.9'
 gem 'bootstrap_form', '~> 2.7.0'
diff --git a/Gemfile.lock b/Gemfile.lock
index e1e5de87eda..6d70b0d9fa6 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -57,7 +57,7 @@ GEM
       faraday_middleware-multi_json (~> 0.0)
       oauth2 (~> 1.0)
     asciidoctor (1.5.6.2)
-    asciidoctor-plantuml (0.0.7)
+    asciidoctor-plantuml (0.0.8)
       asciidoctor (~> 1.5)
     asset_sync (2.2.0)
       activemodel (>= 4.1.0)
@@ -999,7 +999,7 @@ DEPENDENCIES
   allocations (~> 1.0)
   asana (~> 0.6.0)
   asciidoctor (~> 1.5.6)
-  asciidoctor-plantuml (= 0.0.7)
+  asciidoctor-plantuml (= 0.0.8)
   asset_sync (~> 2.2.0)
   attr_encrypted (~> 3.0.0)
   awesome_print (~> 1.2.0)
diff --git a/changelogs/unreleased/44712-update-asciidoctor-from-1-5-3-to-1-5-6-2.yml b/changelogs/unreleased/44712-update-asciidoctor-from-1-5-3-to-1-5-6-2.yml
new file mode 100644
index 00000000000..bdfed89d2ea
--- /dev/null
+++ b/changelogs/unreleased/44712-update-asciidoctor-from-1-5-3-to-1-5-6-2.yml
@@ -0,0 +1,5 @@
+---
+title: Update asciidoctor-plantuml to 0.0.8
+merge_request: 18022
+author: Takuya Noguchi
+type: performance