diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index b02eb2bfed..3a76340ad9 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -1,4 +1,4 @@
-name: LAGraph CI
+name: LAGraph CI with Builtin GraphBLAS
 
 on:
   workflow_dispatch:
@@ -13,29 +13,25 @@ jobs:
     strategy:
       matrix:
         config:
-         - {grb_version: 9.1.0, conda_grb_package_hash: hd29ac08, conda_extension: conda}
+         - {grb_version: 9.3.1}
     steps:
     - name: Checkout
       uses: actions/checkout@v2.0.0
     - name: Install tools for build
       run: |
         sudo apt install -y lcov
-    - name: Get GraphBLAS binaries
+    - name: Build GraphBLAS
       run: |
-        mkdir graphblas-binaries
-        cd graphblas-binaries
-        wget --quiet https://anaconda.org/conda-forge/graphblas/${{ matrix.config.grb_version }}/download/linux-64/graphblas-${{ matrix.config.grb_version }}-${{ matrix.config.conda_grb_package_hash }}_0.${{ matrix.config.conda_extension }}
-        if [ ${{ matrix.config.conda_extension }} == "tar.bz2" ]; then
-          tar xf graphblas-${{ matrix.config.grb_version }}-${{ matrix.config.conda_grb_package_hash }}_0.${{ matrix.config.conda_extension }}
-        else
-          unzip graphblas-${{ matrix.config.grb_version }}-${{ matrix.config.conda_grb_package_hash }}_0.${{ matrix.config.conda_extension }}
-          tar xf pkg-graphblas-${{ matrix.config.grb_version }}-${{ matrix.config.conda_grb_package_hash }}_0.tar.zst
-        fi
+        git clone https://github.com/DrTimothyAldenDavis/GraphBLAS.git
+        cd GraphBLAS
+        git checkout tags/v${{ matrix.config.grb_version }}
+        make compact
+        sudo make install
         cd ..
     - name: Build project
       run: |
-        export GRAPHBLAS_INCLUDE_DIR=`pwd`/graphblas-binaries/include/suitesparse
-        export GRAPHBLAS_LIBRARY=`pwd`/graphblas-binaries/lib/libgraphblas.so
+        export GRAPHBLAS_INCLUDE_DIR=`pwd`/GraphBLAS/include/suitesparse
+        export GRAPHBLAS_LIBRARY=`pwd`/GraphBLAS/lib/libgraphblas.so
         cd build
         cmake .. -DCOVERAGE=1 -DGRAPHBLAS_INCLUDE_DIR=${GRAPHBLAS_INCLUDE_DIR} -DGRAPHBLAS_LIBRARY=${GRAPHBLAS_LIBRARY}
         JOBS=2 make
@@ -57,7 +53,7 @@ jobs:
     strategy:
       matrix:
         config:
-         - {grb_version: 9.1.0, conda_grb_package_hash: heb48c95, conda_extension: conda}
+         - {grb_version: 9.3.1}
     steps:
     - name: Checkout
       uses: actions/checkout@v2.0.0
@@ -66,22 +62,18 @@ jobs:
         brew tap-new libomp/cask
         brew extract --version=14.0.6 libomp libomp/cask
         brew install libomp@14.0.6
-    - name: Get GraphBLAS binaries
+    - name: Build GraphBLAS
       run: |
-        mkdir graphblas-binaries
-        cd graphblas-binaries
-        wget --quiet https://anaconda.org/conda-forge/graphblas/${{ matrix.config.grb_version }}/download/osx-64/graphblas-${{ matrix.config.grb_version }}-${{ matrix.config.conda_grb_package_hash }}_0.${{ matrix.config.conda_extension }}
-        if [ ${{ matrix.config.conda_extension }} == "tar.bz2" ]; then
-          tar xf graphblas-${{ matrix.config.grb_version }}-${{ matrix.config.conda_grb_package_hash }}_0.${{ matrix.config.conda_extension }}
-        else
-          unzip graphblas-${{ matrix.config.grb_version }}-${{ matrix.config.conda_grb_package_hash }}_0.${{ matrix.config.conda_extension }}
-          tar xf pkg-graphblas-${{ matrix.config.grb_version }}-${{ matrix.config.conda_grb_package_hash }}_0.tar.zst
-        fi
+        git clone https://github.com/DrTimothyAldenDavis/GraphBLAS.git
+        cd GraphBLAS
+        git checkout tags/v${{ matrix.config.grb_version }}
+        make compact
+        sudo make install
         cd ..
     - name: Build project
       run: |
-        export GRAPHBLAS_INCLUDE_DIR=`pwd`/graphblas-binaries/include/suitesparse
-        export GRAPHBLAS_LIBRARY=`pwd`/graphblas-binaries/lib/libgraphblas.dylib
+        export GRAPHBLAS_INCLUDE_DIR=`pwd`/GraphBLAS/include/suitesparse
+        export GRAPHBLAS_LIBRARY=`pwd`/GraphBLAS/lib/libgraphblas.dylib
         # adding an extra line to the CMakeLists.txt file to locate the libomp instance installed by brew
         echo 'include_directories("/usr/local/opt/libomp/include")' | cat - CMakeLists.txt
         cd build