diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 50db6de..4260a05 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -8,7 +8,7 @@ on:
 
 jobs:
   test:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
 
     services:
       postgres:
@@ -38,9 +38,9 @@ jobs:
           path: euctr-tracker-data
 
       - name: Install Python 3
-        uses: actions/setup-python@v1
+        uses: actions/setup-python@v5
         with:
-          python-version: 3.6
+          python-version: "3.6.15"
 
       - name: Install dependencies
         run: |
diff --git a/requirements.txt b/requirements.txt
index dfe251d..4f29e0c 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -27,3 +27,5 @@ six==1.11.0
 opentelemetry_api==1.9.1
 opentelemetry-sdk==1.9.1
 opentelemetry-exporter-otlp-proto-grpc==1.9.1
+pyOpenSSL==22.0.0
+cryptography==38.0.4