diff --git a/.github/workflows/flow.yml b/.github/workflows/flow.yml
index 046430d..45b0868 100644
--- a/.github/workflows/flow.yml
+++ b/.github/workflows/flow.yml
@@ -12,7 +12,7 @@ on:
 jobs:
   build:
 
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     strategy:
       matrix:
         python-version: ['3.5', '3.6', '3.7', '3.8']
@@ -23,6 +23,7 @@ jobs:
       uses: actions/setup-python@v2
       with:
         python-version: ${{ matrix.python-version }}
+        architecture: x64
     - name: Install dependencies
       run: |
         pip install coveralls
diff --git a/setup.py b/setup.py
index 8e240e0..ab95bf8 100644
--- a/setup.py
+++ b/setup.py
@@ -19,7 +19,7 @@
                           "cookies==2.2.1",
                           "docopt==0.6.2",
                           "gitdb==0.6.4",
-                          "GitPython==2.0.2",
+                          "GitPython==3.1.41",
                           "mock==2.0.0",
                           "multi-key-dict==2.0.3",
                           "packaging==16.8",