[Security] Update Dockerfile for Ruby 2.6.6 (#13393)

diff --git a/Dockerfile b/Dockerfile
index 77a402a32b896a18df317b239fddde6590ba5177..0537d8facdd416b06f17fa6b246d52aeebdecfcd 100644 (file)
--- a/Dockerfile
+++ b/Dockerfile
@@ -38,8 +38,8 @@ RUN apt update && \
        make -j$(nproc) > /dev/null && \
        make install_bin install_include install_lib
 
-# Install ruby
-ENV RUBY_VER="2.6.5"
+# Install Ruby
+ENV RUBY_VER="2.6.6"
 ENV CPPFLAGS="-I/opt/jemalloc/include"
 ENV LDFLAGS="-L/opt/jemalloc/lib/"
 RUN apt update && \