diff --git a/Dockerfile b/Dockerfile
index be36b8d..66a6640 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,6 +1,6 @@
 FROM rust:1.34 AS riffol_build
 
-RUN cargo install riffol
+RUN cargo install --git https://github.com/shimunn/riffol.git --branch print_error
 
 FROM nginx:mainline
 
diff --git a/riffol.conf b/riffol.conf
index be0431d..b6ec319 100644
--- a/riffol.conf
+++ b/riffol.conf
@@ -108,6 +108,6 @@ healthcheck server {
         checks [
                 "http://127.0.0.1:8082"
         ]
-        interval 15
+        interval 16
         timeout 15
 }