diff --git a/bbnurse b/bbnurse
index ccb687b..9b899b8 100755
--- a/bbnurse
+++ b/bbnurse
@@ -147,7 +147,41 @@ function update_nurse() {
 }
 
 function update_mature() {
-    :
+    srcpackage='nur\sery'
+    destpackage='nulib'
+
+    [ -n "$Dest" ] || Dest=.
+    setx Dest=abspath "$Dest"
+
+    etitle "Maturation de $srcpackage vers $destpackage"
+    sdestdir="$Dest/src"
+    if [ -d "$sdestdir" ]; then
+        setx rsdestdir=relpath "$sdestdir" "$Dest"
+        einfo "$rsdestdir"
+        setx -a sdests=find "$sdestdir" -type f
+        for sdest in "${sdests[@]}"; do
+            destname="${sdest#$Dest/src/}"
+            action "$destname" \
+                   sed -i "s|${srcpackage//\\/\\\\}|${destpackage//\\/\\\\}|g" "$sdest"
+        done
+    else
+        ewarn "$rsdestdir: répertoire non trouvé. il sera ignoré"
+    fi
+
+    tdestdir="$Dest/tests"
+    if [ -d "$tdestdir" ]; then
+        setx rtdestdir=relpath "$tdestdir" "$Dest"
+        einfo "$rtdestdir"
+        setx -a tdests=find "$tdestdir" -type f
+        for tdest in "${tdests[@]}"; do
+            destname="${tdest#$Dest/tests/}"
+            action "$destname" \
+                   sed -i "s|${srcpackage//\\/\\\\}|${destpackage//\\/\\\\}|g" "$tdest"
+        done
+    else
+        ewarn "$rtdestdir: répertoire non trouvé. il sera ignoré"
+    fi
+    eend
 }
 
 action=copy
@@ -160,8 +194,6 @@ args=(
 -cn SRC
 -u[n|m] package|Class [-d DEST]
 
-IMPORTANT: pour l'instant, seule la copie à maturation (-cm) est implémentée
-
 Il y a deux types d'évolutions possibles:
 * mettre en nurserie (-n)
 * arriver à maturation (-m)