Updating conda leads to downgrade and superseded packages

Each time I want to do a conda update conda the following happens:

The following packages will be UPDATED:

  cryptography                         2.4.2-py27hc64555f_0 --> 2.6.1-py27hcfb25f9_0
  openssl                                 1.0.2r-h0c8e037_0 --> 1.1.1b-h0c8e037_1

The following packages will be SUPERSEDED by a higher-priority channel:

  jpeg                        pkgs/main::jpeg-9b-ha175dff_2 --> pkgs/free::jpeg-8d-vc9_2
  libtiff              pkgs/main::libtiff-4.0.10-h1c3b264_2 --> pkgs/free::libtiff-4.0.6-vc9_2
  pyqt                 pkgs/main::pyqt-5.6.0-py27h6e61f57_6 --> pkgs/free::pyqt-4.10.4-py27_1
  qt                     pkgs/main::qt-5.6.2-vc9hc26998b_12 --> pkgs/free::qt-4.8.7-vc9_6

The following packages will be DOWNGRADED:

  spyder                                       3.3.4-py27_0 --> 3.2.8-py27_0

As soon as I am done with the update, I can run a conda update --all, which again updates the versions that have been superseded and therefore downgraded. Can I somehow circumvent that problem and directly do a conda update conda, leaving me with the updated versions without having to run a conda update --all afterwards?

from Updating conda leads to downgrade and superseded packages