diff --git a/tools/overlay_images/overlay_images.xml b/tools/overlay_images/overlay_images.xml
index 31bb5a12..f37633e6 100644
--- a/tools/overlay_images/overlay_images.xml
+++ b/tools/overlay_images/overlay_images.xml
@@ -4,7 +4,7 @@
         <import>creators.xml</import>
         <import>tests.xml</import>
         <token name="@TOOL_VERSION@">0.0.4</token>
-        <token name="@VERSION_SUFFIX@">3</token>
+        <token name="@VERSION_SUFFIX@">4</token>
     </macros>
     <creator>
         <expand macro="creators/bmcv"/>
@@ -20,7 +20,8 @@
         <requirement type="package" version="0.18.1">scikit-image</requirement> 
         <requirement type="package" version="3.3.4">matplotlib</requirement>
         <requirement type="package" version="2020.10.1">tifffile</requirement>
-        <requirement type="package" version="1.20.2">numpy</requirement>
+        <requirement type="package" version="1.21">numpy</requirement>
+        <requirement type="package" version="10.4.0">pillow</requirement>
         <requirement type="package" version="0.1">giatools</requirement>
     </requirements>
     <command detect_errors="aggressive">
@@ -61,7 +62,7 @@
             </when>
             <when value="seg_contour">
                 <param name="im1" type="data" format="tiff,png" label="Intensity image" />
-                <param name="im2" type="data" format="tiff,png" label="Label image" />
+                <param name="im2" type="data" format="tiff,png" label="Label map" />
                 <param name="thickness" type="integer" value="2" min="1" label="Contour thickness (in pixels)" />
                 <param name="color" type="color" value="#ff0000" label="Contour color"/>
                 <param argument="--show_label" type="boolean" checked='false' truevalue="--show_label" falsevalue="" label="Show labels" />