A new patch for Deponia was released on Steam (10.12.15) with an engine update and some bugfixes.

Changelog [English] - 10.12.2015
Engine Update to Visionaire 4.2.5

OSX: Fixed not being able to return to the game via the dock or with Alt-Tab
OSX: Fixed constant display of the system cursor

Linux: Fixed problems with Steam Achievements not working at all

Fixed: Game running too fast with deactived VSync
Fixed: Disappearing characters after savegame loading
Fixed: Game crashing with activated texture compression
Fixed: Game crashing after savegame loading because of memory fragmentation
Fixed: Game crashing when using the fork with the horn at the tower
Fixed: Italian localization errors and incorrect file links
Fixed: Localization error on menu back button
Fixed: Several exits not reacting immediatly to clicks while standing on the destination point
Fixed: Several exits in chapter 1 not using the intended different reaction for single- and doubleclick
Fixed: Layer error when standing near the dud
Added: Missing sound effect when picking up the wasabi peas
Fixed: Double voice of Lotti in the town hall
Fixed: Localization error when using items with the chili pepper
Fixed: Localization error when setting fire to the inventory
Fixed: Not being able to pick up the Stimulant from inventory
Fixed: Restrain Rufus while entering the Safecode
Fixed: Errors entering Toni's shop using doubleclick from the towncenter
Fixed: Missing dialog box when entering Toni's shop for the first time
Fixed: Missing dialog box when entering Wenzel's house for the first time
Fixed: Hearing the walking sound of the angry Postbot in other rooms
Fixed: Rufus not taking the glas of booze while the drawer is opened
Fixed: Occasionally jumping animation when picking up the foot fetters
Fixed: Missing dialog branch with Hannek from cleaning the windshield
Fixed: Graphic layer errors in the Minebike control center resulting in missing lever images
Fixed: Animation errors when entering the elevetor code for the first time
Fixed: Localization errors while cleaning the cartridge
Fixed: Missing dialog box when talking to Goal after inserting the cleaned cartridge
Fixed: Disabled exit while being cornered by Cletus

Source: http://steamcommunity.com/app/214340/discussions/0/487876568222788857/

I hope we will see the patch here too.

Patch is here since yesterday. Thanks!
For the patchnotes for all 3 Deponia games look here:
https://www.gog.com/forum/deponia_series/changelog/post2 (Thanks PaterAlf!)

Thanks!

But what about Deponia 2? The Version of Deponia 2 on GOG.com is very, very outdated compared to the version on Steam! On GOG.com the version 2.0 is available only (runs with Visionaire 3.x and is very, very, very slow and sluggish!). On Steam the version of Deponia 2 is > 3.3.

I posted that mistake here, but I got no answer:
http://forum.daedalic.de/viewtopic.php?f=114&t=5758

OK, now the complete Deponia series is up to date!

Thanks!