diff --git a/Dockerfile b/Dockerfile
index 1a4fcf3..595a1a9 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM ruby:2.5
+FROM ruby:2.7.8
 RUN ruby --version
 RUN apt-get update && \
     apt-get install cmake -y