diff --git a/building/Dockerfile.Ubuntu-20.04 b/building/Dockerfile.Ubuntu-20.04
index 81bb730..6b7b83a 100644
--- a/building/Dockerfile.Ubuntu-20.04
+++ b/building/Dockerfile.Ubuntu-20.04
@@ -48,6 +48,7 @@ RUN apt install -y \
     uuid-dev \
     wget \
     xdg-utils \
+    xsltproc \
     xterm \
     xz-utils \
     zlib1g-dev
diff --git a/building/Dockerfile.Ubuntu-22.04 b/building/Dockerfile.Ubuntu-22.04
index 1e4de04..169b75b 100644
--- a/building/Dockerfile.Ubuntu-22.04
+++ b/building/Dockerfile.Ubuntu-22.04
@@ -49,8 +49,8 @@ RUN apt install -y \
     unzip \
     uuid-dev \
     wget \
-    xalan \
     xdg-utils \
+    xsltproc \
     xterm \
     xz-utils \
     zlib1g-dev