Is the Sabbath part of the "special days and months and seasons and years" Paul is referring to in Galatians 4:10?

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Galatians 4:8-11 (NIV) says:

8 Formerly, when you did not know God, you were slaves to those who by nature are not gods. 9 But now that you know God—or rather are known by God—how is it that you are turning back to those weak and miserable forces? Do you wish to be enslaved by them all over again? 10 You are observing special days and months and seasons and years! 11 I fear for you, that somehow I have wasted my efforts on you.

Paul looks disappointed that the Galatians are back to "observing special days and months and seasons and years" (verse 10). Is the Sabbath (Exodus 20:8-11) included in the list?