Chromium v66 (branch 3359) is currently a supported Release branch in upstream CEF and can be downloaded from Spotify builds.

Notable changes since v57 (incomplete list):

• Ubuntu 12 / 13 and Debian 7 no more supported by upstream Chromium/CEF (Issue Ubuntu 12 / 13 and Debian 7 no more supported in upstream Chromium/CEF #401)
• There is a breaking change in v59 in offscreen windows, they are now automatically transparent due to this CEF commit. To make a offscreen window non-transparent you need to set the background colour using BrowserSettings.background_color. Ref: Update to Cef Version 59.0.0 cefsharp/CefSharp#2114
• Chromium starts supporting fast jumbo builds, so support for "use_jumbo_build" flag should be added to tools/automate.py
• Other changes to automate.py are required as well, see AutomatedBuildSetup wiki page for changes. For example the enable_precompiled_headers=false can be set to avoid known issue with clang.

New branch "cefpython58" should be created from current master before updating.

Related:

• Issue Workflow when updating CEF version #264 ("Workflow when updating CEF version").