diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index c3d8dae..b556b4b 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -30,7 +30,9 @@ jobs:
         python -m pip install --upgrade pip setuptools
         # apparently the runners all have conda installed
         # use that to install syri, as it isn't on pypi
-        $CONDA/bin/conda install -c conda-forge -c bioconda "syri>=1.6.5"
+        # manually install syris dependencies, conda does not install
+        pip install Cython numpy pandas scipy psutil igraph longestrunsubsequence pysam pulp
+        $CONDA/bin/conda install --freeze-installed --no-deps -c conda-forge -c bioconda "syri>=1.6.5"
         if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
     - name: Build package
       run: pip install .