diff --git a/scripts/custom-docker-build b/scripts/custom-docker-build
index 90d717a..956ec7e 100755
--- a/scripts/custom-docker-build
+++ b/scripts/custom-docker-build
@@ -192,8 +192,8 @@ function print_ruby_args() {
             ;;
 
         2.7|2.7.patched)
-            RUBY_VERSION="2.7.6"
-            RUBY_DOWNLOAD_SHA256="e7203b0cc09442ed2c08936d483f8ac140ec1c72e37bb5c401646b7866cb5d10"
+            RUBY_VERSION="2.7.5"
+            RUBY_DOWNLOAD_SHA256="2755b900a21235b443bb16dadd9032f784d4a88f143d852bc5d154f22b8781f1"
             ;;
 
         # Please update any clients still asking for these images to request `ruby-2.7` instead,