diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 2d1808b393..81c4d23c1f 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -12,12 +12,48 @@ env:
   # RUSTFLAGS: "-D warnings"  # it needs some works to enable this flag
 
 jobs:
-  tests:
+  test-on-ubuntu:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Free Disk Space (Ubuntu)
+        uses: jlumbroso/free-disk-space@main
+        with:
+          # this might remove tools that are actually needed,
+          # if set to "true" but frees about 6 GB
+          tool-cache: false
+          
+          # all of these default to true, but feel free to set to
+          # "false" if necessary for your workflow
+          android: true
+          dotnet: true
+          haskell: true
+          large-packages: true
+          docker-images: true
+          swap-storage: true
+      - uses: actions/checkout@v2
+      - uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          override: true
+          components: rustfmt
+      - name: Setup Python # Set Python version
+        uses: actions/setup-python@v4
+        with:
+          python-version: 3.8
+      # Install pip and pytest
+      - name: Install dependencies
+        run: |
+          python -m pip install --upgrade pip
+          pip install -r .github/workflows/requirements.txt
+      - name: Execute test-all
+        run: ./test-all
+        shell: bash
+  test-on-others:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
         os:
-          - ubuntu-latest
           - macos-latest
           - windows-latest
     steps:
@@ -54,4 +90,4 @@ jobs:
 #          toolchain: ${{ matrix.rust }}
 #          override: true
 #          components: clippy
-#      - run: cargo clippy
\ No newline at end of file
+#      - run: cargo clippy
diff --git a/Cargo.toml b/Cargo.toml
index 9fd2f997de..0bcc319149 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -29,7 +29,7 @@ byteorder = "1.4.3"
 crc = "3.0.0"
 half = "2.1.0"
 # This is used internally but not intended to be exposed through the API.
-protobuf = "=2.27.1"
+protobuf = "2.27.1"
 # Enables conversions between ndarray::Array objects and tensorflow::Tensor
 ndarray = { version = "0.15.6", optional = true }
 rustversion = "1.0.9"