diff --git a/scripts/lib/custom-docker-build b/scripts/lib/custom-docker-build
index 95d4823..3d1b7b3 100755
--- a/scripts/lib/custom-docker-build
+++ b/scripts/lib/custom-docker-build
@@ -235,7 +235,7 @@ function print_bundler_args() {
             BUNDLER_VERSION=2.1.4
             ;;
         2.3)
-            BUNDLER_VERSION=2.3.12
+            BUNDLER_VERSION=2.3.15
             ;;
         *) echo "Unknown bundler version $1"; exit 1;
     esac