diff --git a/pon2.nimble b/pon2.nimble
index 862b573..e2ebecc 100644
--- a/pon2.nimble
+++ b/pon2.nimble
@@ -1,6 +1,6 @@
 # Package
 
-version = "0.23.9"
+version = "0.23.10"
 author = "Keisuke Izumiya"
 description = "Application for Puyo Puyo and Nazo Puyo"
 license = "Apache-2.0"
diff --git a/src/pon2/private/main/web.nim b/src/pon2/private/main/web.nim
index aad5fbd..16e422e 100644
--- a/src/pon2/private/main/web.nim
+++ b/src/pon2/private/main/web.nim
@@ -94,7 +94,11 @@ else:
         tdiv(class = "column is-narrow"):
           text &"Pon!通 Version {Pon2Version}"
         tdiv(class = "column is-narrow"):
-          a(href = kstring &"https://{Pon2Fqdn}/pon2/docs/simulator/"):
+          a(
+            href = kstring &"https://{Pon2Fqdn}/pon2/docs/simulator/",
+            target = "_blank",
+            rel = "noopener noreferrer",
+          ):
             text "操作方法"
 
   when defined(pon2.marathon):