Bug/Issue no possibility to update stardew valley to 1.3.23 version

I begun to mod using SMAPI but when I'm trying to open up the modded stradew this message appears:
"[SMAPI] SMAPI 2.6-beta.20.1 with Stardew Valley 1.2.33 on Microsoft Windows 10 Home
[SMAPI] Mods go here: C:\Program Files (x86)\Steam\steamapps\common\Stardew Valley\Mods
[SMAPI] Oops! You're running Stardew Valley 1.2.33, but the oldest supported version is 1.3.23. Please update your game before using SMAPI.
[SMAPI] Game has ended. Press any key to exit."

I checked on steam but it tells me there are no update...according to steam I've got the leatest update, according to SMAPI internet explorer is more updated than me
Help please.

 

You have the latest release version of the game, but have the beta version of SMAPI. Either install version 2.5.5 of SMAPI or opt into the beta.

 

thanks