The metadata of package does not match any of the metadata in the repositories

Hi there,
Just updated Contao Manager to 1.10.1 (from 1.9.2). Went fine. But now I'm trying to update to Contao 4.13.54 (from 4.13.53) and I'm getting the error below. Same error when I want to update some plugin. Is this due to the composer.lock Validation I read about this week? Any solution? Thanks.
-Sander



The metadata of package "contao-community-alliance/meta-palettes" in version "2.1.3.0" does not match any of the metadata in the repositories. Diff (provided package / valid package): --- Original
53
+++ New
54
@@ @@
55
"type": "contao-bundle",
56
"extra": {
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"branch-alias": {
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+ "dev-master": "2.1.x-dev",
59
"dev-develop": "2.2.x-dev",
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- "dev-master": "2.1.x-dev",
61
"dev-support\/1.x": "1.11.x-dev"
62
},
63
"contao-manager-plugin": "ContaoCommunityAlliance\\MetaPalettes\\ContaoMana ger\\Plugin"