matplotlib
diff --git a/‎.appveyor.yml‎
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diff --git a/‎azure-pipelines.yml‎
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@@ -18,6 +18,7 @@ environment:
     PYTHONIOENCODING: UTF-8
     PYTEST_ARGS: -raR --numprocesses=auto --timeout=300 --durations=25
                  --cov-report= --cov=lib --log-level=DEBUG
+    PINNEDVERS: "pyzmq!=21.0.0"
 
   matrix:
     # In theory we could use a single CONDA_INSTALL_LOCN because we construct
 
@@ -81,7 +81,7 @@ steps:
         texlive-xetex texlive-luatex
       ;;
     darwin)
-      brew cask install xquartz
+      brew install --cask xquartz
       brew install pkg-config ffmpeg imagemagick mplayer ccache
       ;;
     win32)