diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 3575bee..522a516 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -16,11 +16,19 @@ jobs:
       with:
         python-version: ${{ matrix.python-version }}
 
+    - name: Show Python version
+      run: |
+        python --version
+
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
         pip install -r requirements.txt
 
+    - name: List dependencies
+      run: |
+        pip list
+
     - name: Download assert.sh
       run: |
         wget https://raw.githubusercontent.com/lehmannro/assert.sh/master/assert.sh
@@ -45,6 +53,10 @@ jobs:
       run: |
         docker run -d -it --name my-gu-pa-jus gu-pa-jus
 
+    - name: List Docker containers
+      run: |
+        docker ps -a
+
     - name: Grade the sample assignment (dry-run)
       run: |
         snakemake kadai --config kadainame="sample" -n