diff --git a/Dockerfile b/Dockerfile
index 63e32cc..f5d3eb5 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -19,7 +19,7 @@ FROM jlesage/baseimage-gui:alpine-3.17-v4.3.3
 ARG DOCKER_IMAGE_VERSION=
 
 # Define software versions.
-ARG FIREFOX_VERSION=108.0.1-r1
+ARG FIREFOX_VERSION=109.0.1-r0
 ARG JSONLZ4_VERSION=c4305b8
 ARG LZ4_VERSION=1.8.1.2
 #ARG PROFILE_CLEANER_VERSION=2.36