diff --git a/.circleci/config.yml b/.circleci/config.yml
index 237e5ee..4473025 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -7,7 +7,7 @@ alias:
           GOPATH: "/go"
           GO111MODULE: "on"
           LD_LIBRARY_PATH: /usr/local/lib
-          NGT_VERSION: 1.4.5
+          NGT_VERSION: 1.6.1
           REPO_NAME: "yahoojapan"
           IMAGE_NAME: "ngtd"
           GITHUB_API: "https://api.github.com/"