diff --git a/.github/workflows/conda_package.yml b/.github/workflows/conda_package.yml
index d2f1fe68dd..7cdddbd655 100644
--- a/.github/workflows/conda_package.yml
+++ b/.github/workflows/conda_package.yml
@@ -38,23 +38,37 @@ jobs:
         with:
           miniconda-version: "latest"
           auto-update-conda: true
+          channel-priority: true
+          mamba-version: "*"
           python-version: ${{ matrix.python }}
           activate-environment: recipe
           channels: ml4t, conda-forge, defaults, anaconda, ranaroussi, adteam
 
-      - name: conda install
+      - name: create uploader
+        # address broken client under py3.9
+        if: ${{ matrix.python == '3.9' }}
+        run: conda create -n up python=3.7 anaconda-client
+
+      - name: conda build for ${{ matrix.os }}
         run: |
           conda activate recipe
-          conda install -n recipe conda-build conda-verify anaconda-client
+          mamba install -n recipe boa conda-verify anaconda-client
+          conda mambabuild --output-folder . --python ${{ matrix.python }} conda/zipline-reloaded
 
-      - name: conda build for ${{ matrix.os }}
-        run: conda-build --output-folder . --python ${{ matrix.python }} conda/zipline-reloaded/
+      - name: activate uploader
+        # address broken client under py3.9
+        if: ${{ matrix.python == '3.9' }}
+        run: conda activate up
 
-      - name: store macos result
+      - name: store windows result
         uses: actions/upload-artifact@v2
-        if: ${{ matrix.os == 'macos-latest' }}
+        if: ${{ matrix.os == 'windows-latest' }}
         with:
-          path: osx-64/*.tar.bz2
+          path: win-64/*.tar.bz2
+
+      - name: upload windows
+        if: ${{ matrix.os == 'windows-latest' }}
+        run: anaconda upload -l main -u ml4t win-64/*.tar.bz2
 
       - name: store linux result
         uses: actions/upload-artifact@v2
@@ -62,23 +76,16 @@ jobs:
         with:
           path: linux-64/*.tar.bz2
 
-      - name: store windows result
+      - name: upload linux
+        if: ${{ matrix.os  == 'ubuntu-latest' }}
+        run: anaconda upload -l main -u ml4t linux-64/*.tar.bz2
+
+      - name: store macos result
         uses: actions/upload-artifact@v2
-        if: ${{ matrix.os == 'windows-latest' }}
+        if: ${{ matrix.os == 'macos-latest' }}
         with:
-          path: win-64/*.tar.bz2
+          path: osx-64/*.tar.bz2
 
-      - name: upload ${{ matrix.os }} result to anaconcda
-        if: ${{ matrix.python != '3.9'}}
-        env:
-          OS: ${{ matrix.os }}
-        run: |
-          if [ "$OS" == "ubuntu-latest" ] ; then
-            anaconda upload -l main -u ml4t linux-64/*.tar.bz2
-          else
-            if [ "$OS" == "macos-latest" ] ; then
-              anaconda upload -l main -u ml4t osx-64/*.tar.bz2
-           else
-              anaconda upload -l main -u ml4t win-64/*.tar.bz2
-            fi
-          fi
+      - name: upload macos
+        if: ${{ matrix.os == 'macos-latest' }}
+        run: anaconda upload -l main -u ml4t osx-64/*.tar.bz2