diff --git a/admin/sync/exercices.go b/admin/sync/exercices.go
index 81d3265f..0e6b5258 100644
--- a/admin/sync/exercices.go
+++ b/admin/sync/exercices.go
@@ -36,7 +36,7 @@ func SyncExercices(i Importer, theme fic.Theme) []string {
 	if exercices, err := getExercices(i, theme); err != nil {
 		errs = append(errs, err.Error())
 	} else {
-		dmap := map[int]fic.Exercice{}
+		dmap := map[int64]fic.Exercice{}
 		emap := map[string]int{}
 		for _, edir := range exercices {
 			edir_splt := strings.SplitN(edir, "-", 2)
@@ -68,6 +68,7 @@ func SyncExercices(i Importer, theme fic.Theme) []string {
 
 			// Handle score gain
 			var gain int64
+			var depend *fic.Exercice
 			if p, err := parseExerciceParams(i, path.Join(theme.Path, edir)); err != nil {
 				errs = append(errs, fmt.Sprintf("%q: challenge.txt: %s", edir, err))
 				continue
@@ -75,6 +76,27 @@ func SyncExercices(i Importer, theme fic.Theme) []string {
 				errs = append(errs, fmt.Sprintf("%q: challenge.txt: Undefined gain for challenge", edir))
 			} else {
 				gain = p.Gain
+
+				// Handle dependency
+				if len(p.Dependencies) > 0 {
+					if len(p.Dependencies[0].Theme) > 0 && p.Dependencies[0].Theme != theme.Name {
+						errs = append(errs, fmt.Sprintf("%q: unable to treat dependency to another theme: not implemented.", edir))
+					} else {
+						for ed, e := range dmap {
+							if ed == p.Dependencies[0].Id {
+								depend = &e
+								break
+							}
+						}
+						if depend == nil {
+							dmap_keys := []string{}
+							for k, _ := range dmap {
+								dmap_keys = append(dmap_keys, fmt.Sprintf("%d", k))
+							}
+							errs = append(errs, fmt.Sprintf("%q: Unable to find required dependancy %q (available at time of processing: %s)", edir, p.Dependencies[0].Id, strings.Join(dmap_keys, ",")))
+						}
+					}
+				}
 			}
 
 			// Handle video
@@ -89,11 +111,11 @@ func SyncExercices(i Importer, theme fic.Theme) []string {
 			overview = string(blackfriday.Run([]byte(overview)))
 
 			if e, err := theme.GetExerciceByTitle(ename); err != nil {
-				if ex, err := theme.AddExercice(ename, fic.ToURLid(ename), path.Join(theme.Path, edir), statement, overview, nil, gain, videoURI); err != nil {
+				if ex, err := theme.AddExercice(ename, fic.ToURLid(ename), path.Join(theme.Path, edir), statement, overview, depend, gain, videoURI); err != nil {
 					errs = append(errs, fmt.Sprintf("%q: error on exercice add: %s", edir, err))
 					continue
 				} else {
-					dmap[eid] = ex
+					dmap[int64(eid)] = ex
 				}
 			} else if e.Title != ename || e.URLId == "" || e.Statement != statement || e.Overview != overview || e.Gain != gain || e.VideoURI != videoURI {
 				e.Title = ename
@@ -106,10 +128,10 @@ func SyncExercices(i Importer, theme fic.Theme) []string {
 					errs = append(errs, fmt.Sprintf("%q: error on exercice update: %s", edir, err))
 					continue
 				} else {
-					dmap[eid] = e
+					dmap[int64(eid)] = e
 				}
 			} else {
-				dmap[eid] = e
+				dmap[int64(eid)] = e
 			}
 		}
 
@@ -121,35 +143,6 @@ func SyncExercices(i Importer, theme fic.Theme) []string {
 				}
 			}
 		}
-
-		dmap_keys := []string{}
-		for k, _ := range dmap {
-			dmap_keys = append(dmap_keys, fmt.Sprintf("%d", k))
-		}
-		for _, e := range dmap {
-			// No error if the file doesn't exist
-			if ! i.exists(path.Join(e.Path, "depends.txt")) {
-				continue
-			}
-
-			// Treat depends.txt
-			if depends, err := getFileContent(i, path.Join(e.Path, "depends.txt")); err != nil {
-				errs = append(errs, fmt.Sprintf("%q: depends.txt: %s", path.Base(e.Path), err))
-			} else {
-				for nline, dep := range strings.Split(depends, "\n") {
-					if did, err := strconv.Atoi(dep); err != nil {
-						errs = append(errs, fmt.Sprintf("%q: depends.txt:%d: %s", path.Base(e.Path), nline + 1, err))
-						continue
-					} else if exdep, exist := dmap[did]; !exist {
-						errs = append(errs, fmt.Sprintf("%q: depends.txt:%d: Unable to find required dependancy %q (%d ; available: %s)", path.Base(e.Path), nline + 1, dep, did, strings.Join(dmap_keys, ",")))
-						continue
-					} else {
-						e.Depend = &exdep.Id
-						e.Update()
-					}
-				}
-			}
-		}
 	}
 	return errs
 }