diff --git a/Dockerfile b/Dockerfile
index 8d6c18e..3b966ab 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -8,7 +8,7 @@
 ARG DOCKER_IMAGE_VERSION=
 
 # Define software versions.
-ARG MKVTOOLNIX_VERSION=85.0
+ARG MKVTOOLNIX_VERSION=86.0
 ARG MEDIAINFO_VERSION=24.06
 ARG MEDIAINFOLIB_VERSION=24.06
 ARG ZENLIB_VERSION=0.4.41