diff --git a/lib/git/pr/release/util.rb b/lib/git/pr/release/util.rb
index 8ae61ae..8689715 100644
--- a/lib/git/pr/release/util.rb
+++ b/lib/git/pr/release/util.rb
@@ -157,7 +157,7 @@ def merge_pr_body(old_body, new_body)
           merged_body = pr_body_lines.join("\n")
           check_status.each { |issue_number, check_value|
             say "Update pull-request checkbox \##{issue_number} to #{check_value}.", :trace
-            merged_body.gsub! /^- \[ \] \##{issue_number}/, "- [#{check_value}] \##{issue_number}"
+            merged_body.gsub! /^- \[ \] \##{issue_number}\b/, "- [#{check_value}] \##{issue_number}"
           }
 
           merged_body
diff --git a/spec/git/pr/release_spec.rb b/spec/git/pr/release_spec.rb
index 5978eef..31a5a0d 100644
--- a/spec/git/pr/release_spec.rb
+++ b/spec/git/pr/release_spec.rb
@@ -90,6 +90,26 @@
         MARKDOWN
       }
     end
+    context "new pr added when the same numbers are included in a forward match" do
+      it {
+        actual = merge_pr_body(<<~OLD_BODY, <<~NEW_BODY)
+          - [x] #3 Provides a creating release pull-request object for template @hakobe
+          - [ ] #6 Support two factor auth @ninjinkun
+        OLD_BODY
+          - [ ] #3 Provides a creating release pull-request object for template @hakobe
+          - [ ] #4 use user who create PR if there is no assignee @hakobe
+          - [ ] #6 Support two factor auth @ninjinkun
+          - [ ] #30 Extract logic from bin/git-pr-release @banyan
+        NEW_BODY
+
+        expect(actual).to eq <<~MARKDOWN.chomp
+          - [x] #3 Provides a creating release pull-request object for template @hakobe
+          - [ ] #4 use user who create PR if there is no assignee @hakobe
+          - [ ] #6 Support two factor auth @ninjinkun
+          - [ ] #30 Extract logic from bin/git-pr-release @banyan
+        MARKDOWN
+      }
+    end
   end
 
   describe "#host_and_repository_and_scheme" do