-RUN cd /tmp && curl -LO https://cache.ruby-lang.org/pub/ruby/2.6/ruby-2.6.5.tar.gz && \
- tar -xf ruby-2.6.5.tar.gz && cd ruby-2.6.5 && ./configure
-RUN cd /tmp/ruby-2.6.5 && make && make install
+RUN cd /tmp && curl -LO https://cache.ruby-lang.org/pub/ruby/2.6/ruby-2.6.6.tar.gz && \
+ tar -xf ruby-2.6.6.tar.gz && cd ruby-2.6.6 && ./configure
+RUN cd /tmp/ruby-2.6.6 && make && make install