diff --git a/2.6-rc/alpine3.7/Dockerfile b/2.6-rc/alpine3.7/Dockerfile
index c312dcf6e..00b2ea290 100644
--- a/2.6-rc/alpine3.7/Dockerfile
+++ b/2.6-rc/alpine3.7/Dockerfile
@@ -8,8 +8,8 @@ RUN mkdir -p /usr/local/etc \
 	} >> /usr/local/etc/gemrc
 
 ENV RUBY_MAJOR 2.6-rc
-ENV RUBY_VERSION 2.6.0-preview2
-ENV RUBY_DOWNLOAD_SHA256 00ddfb5e33dee24469dd0b203597f7ecee66522ebb496f620f5815372ea2d3ec
+ENV RUBY_VERSION 2.6.0-preview3
+ENV RUBY_DOWNLOAD_SHA256 9856d9e0e32df9e5cdf01928eec363d037f1a76dab2abbf828170647beaf64fe
 ENV RUBYGEMS_VERSION 2.7.8
 ENV BUNDLER_VERSION 1.17.1
 
diff --git a/2.6-rc/alpine3.8/Dockerfile b/2.6-rc/alpine3.8/Dockerfile
index 8296900ef..804fb8f5b 100644
--- a/2.6-rc/alpine3.8/Dockerfile
+++ b/2.6-rc/alpine3.8/Dockerfile
@@ -8,8 +8,8 @@ RUN mkdir -p /usr/local/etc \
 	} >> /usr/local/etc/gemrc
 
 ENV RUBY_MAJOR 2.6-rc
-ENV RUBY_VERSION 2.6.0-preview2
-ENV RUBY_DOWNLOAD_SHA256 00ddfb5e33dee24469dd0b203597f7ecee66522ebb496f620f5815372ea2d3ec
+ENV RUBY_VERSION 2.6.0-preview3
+ENV RUBY_DOWNLOAD_SHA256 9856d9e0e32df9e5cdf01928eec363d037f1a76dab2abbf828170647beaf64fe
 ENV RUBYGEMS_VERSION 2.7.8
 ENV BUNDLER_VERSION 1.17.1
 
diff --git a/2.6-rc/stretch/Dockerfile b/2.6-rc/stretch/Dockerfile
index bb94cdc9f..87de6ea70 100644
--- a/2.6-rc/stretch/Dockerfile
+++ b/2.6-rc/stretch/Dockerfile
@@ -8,8 +8,8 @@ RUN mkdir -p /usr/local/etc \
 	} >> /usr/local/etc/gemrc
 
 ENV RUBY_MAJOR 2.6-rc
-ENV RUBY_VERSION 2.6.0-preview2
-ENV RUBY_DOWNLOAD_SHA256 00ddfb5e33dee24469dd0b203597f7ecee66522ebb496f620f5815372ea2d3ec
+ENV RUBY_VERSION 2.6.0-preview3
+ENV RUBY_DOWNLOAD_SHA256 9856d9e0e32df9e5cdf01928eec363d037f1a76dab2abbf828170647beaf64fe
 ENV RUBYGEMS_VERSION 2.7.8
 ENV BUNDLER_VERSION 1.17.1
 
diff --git a/2.6-rc/stretch/slim/Dockerfile b/2.6-rc/stretch/slim/Dockerfile
index 4e7588968..55f34f302 100644
--- a/2.6-rc/stretch/slim/Dockerfile
+++ b/2.6-rc/stretch/slim/Dockerfile
@@ -20,8 +20,8 @@ RUN mkdir -p /usr/local/etc \
 	} >> /usr/local/etc/gemrc
 
 ENV RUBY_MAJOR 2.6-rc
-ENV RUBY_VERSION 2.6.0-preview2
-ENV RUBY_DOWNLOAD_SHA256 00ddfb5e33dee24469dd0b203597f7ecee66522ebb496f620f5815372ea2d3ec
+ENV RUBY_VERSION 2.6.0-preview3
+ENV RUBY_DOWNLOAD_SHA256 9856d9e0e32df9e5cdf01928eec363d037f1a76dab2abbf828170647beaf64fe
 ENV RUBYGEMS_VERSION 2.7.8
 ENV BUNDLER_VERSION 1.17.1