diff --git a/dist/index.js b/dist/index.js
index 023dcde..8e4bf61 100644
--- a/dist/index.js
+++ b/dist/index.js
@@ -29420,7 +29420,7 @@ config:
         yAxis:
             titlePadding: 16
 ---
-xychart-beta
+xychart-beta horizontal
     title "${this.workflow.name} (${this.workflow.path}${status})"
     x-axis [${xAxis.join(",")}]
     y-axis "Duration (in seconds)"
diff --git a/src/MermaidXYChart.ts b/src/MermaidXYChart.ts
index 3b634fb..4d7c066 100644
--- a/src/MermaidXYChart.ts
+++ b/src/MermaidXYChart.ts
@@ -47,7 +47,7 @@ config:
         yAxis:
             titlePadding: 16
 ---
-xychart-beta
+xychart-beta horizontal
     title "${this.workflow.name} (${this.workflow.path}${status})"
     x-axis [${xAxis.join(",")}]
     y-axis "Duration (in seconds)"
diff --git a/tests/GitHubIssueContent.test.ts b/tests/GitHubIssueContent.test.ts
index a619ff5..50381f3 100644
--- a/tests/GitHubIssueContent.test.ts
+++ b/tests/GitHubIssueContent.test.ts
@@ -71,7 +71,7 @@ config:
         yAxis:
             titlePadding: 16
 ---
-xychart-beta
+xychart-beta horizontal
     title "ABC (abc.yml)"
     x-axis [2024-02-27]
     y-axis "Duration (in seconds)"
@@ -89,7 +89,7 @@ config:
         yAxis:
             titlePadding: 16
 ---
-xychart-beta
+xychart-beta horizontal
     title "XYZ (xyz.yml)"
     x-axis [2024-03-28]
     y-axis "Duration (in seconds)"
diff --git a/tests/MermaidXYChart.test.ts b/tests/MermaidXYChart.test.ts
index 53faa89..2b1d034 100644
--- a/tests/MermaidXYChart.test.ts
+++ b/tests/MermaidXYChart.test.ts
@@ -90,7 +90,7 @@ config:
         yAxis:
             titlePadding: 16
 ---
-xychart-beta
+xychart-beta horizontal
     title "ABC (abc.yml)"
     x-axis [2024-02-19,2024-02-20,2024-02-21,2024-02-22,2024-02-23,2024-02-24,2024-02-25,2024-02-26,2024-02-27]
     y-axis "Duration (in seconds)"
@@ -137,7 +137,7 @@ config:
         yAxis:
             titlePadding: 16
 ---
-xychart-beta
+xychart-beta horizontal
     title "ABC (abc.yml for status=success)"
     x-axis [2024-02-19]
     y-axis "Duration (in seconds)"