diff --git a/roles/pi_musicmouse/files/tippen-curriculum.yml b/roles/pi_musicmouse/files/tippen-curriculum.yml
index 3766ad1..9ebac9b 100644
--- a/roles/pi_musicmouse/files/tippen-curriculum.yml
+++ b/roles/pi_musicmouse/files/tippen-curriculum.yml
@@ -371,8 +371,15 @@ worlds:
       - title: "Übung: Welt 3 komplett"
         subtitle: "Alles aus der unteren Reihe"
         drill: true
-        # Unlocks the first five episodes of GEOlino Spezial, oldest first.
-        unlocks: "Kinderpodcasts/GEOlino Spezial/20200323 - Das Immunsystem.mp3"
+        # Unlocks GEOlino Spezial. Naming the newest episode unlocks the whole show,
+        # because an episode reward unlocks every episode up to and including the one
+        # named (chronologically, oldest first) - so until this lesson is passed, the
+        # entire show is locked.
+        #
+        # An episode that arrives after this one is downloaded is newer than the named
+        # target, so it stays locked with nothing left to unlock it. Re-point this at
+        # the newest episode when that starts to matter.
+        unlocks: "Kinderpodcasts/GEOlino Spezial/20260901 - Der Vater der Chemie.mp3"
 
   - number: 4
     title: "Große Buchstaben"