diff --git a/.github/workflows/python.yml b/.github/workflows/python.yml
index 23384df..be2f5cf 100644
--- a/.github/workflows/python.yml
+++ b/.github/workflows/python.yml
@@ -5,15 +5,15 @@ on:
 
 jobs:
   dependencies:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v3
       - name: Setup Python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v4
         with:
           python-version: '3.9.5'
       - name: Cache dependencies
-        uses: actions/cache@v2
+        uses: actions/cache@v3
         with:
           path: ~/.m2/repository
           key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt', '**/requirements-dev.txt') }}
@@ -23,7 +23,7 @@ jobs:
         run: pip3 install -r requirements.txt -r requirements-dev.txt
   tests:
     needs: [dependencies]
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     services:
       postgres:
         image: postgres:14
@@ -41,11 +41,11 @@ jobs:
     steps:
       - uses: actions/checkout@v3
       - name: Setup Python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v4
         with:
           python-version: '3.9.5'
       - name: Cache dependencies
-        uses: actions/cache@v2
+        uses: actions/cache@v3
         with:
           path: ~/.m2/repository
           key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt', '**/requirements-dev.txt') }}
@@ -63,15 +63,15 @@ jobs:
           token: ${{ secrets.CODECOV }}
   linting:
     needs: [tests]
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v3
       - name: Setup Python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v4
         with:
           python-version: '3.9.5'
       - name: Cache dependencies
-        uses: actions/cache@v2
+        uses: actions/cache@v3
         with:
           path: ~/.m2/repository
           key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt', '**/requirements-dev.txt') }}
@@ -83,15 +83,15 @@ jobs:
         run: flake8
   typing:
     needs: [tests]
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v3
       - name: Setup Python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v4
         with:
           python-version: '3.9.5'
       - name: Cache dependencies
-        uses: actions/cache@v2
+        uses: actions/cache@v3
         with:
           path: ~/.m2/repository
           key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt', '**/requirements-dev.txt') }}
@@ -103,15 +103,15 @@ jobs:
         run: mypy
   formatting:
     needs: [tests]
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-20.04
     steps:
       - uses: actions/checkout@v3
       - name: Setup Python
-        uses: actions/setup-python@v2
+        uses: actions/setup-python@v4
         with:
           python-version: '3.9.5'
       - name: Cache dependencies
-        uses: actions/cache@v2
+        uses: actions/cache@v3
         with:
           path: ~/.m2/repository
           key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt', '**/requirements-dev.txt') }}
diff --git a/tests/test_didier/test_utils/test_types/test_datetime.py b/tests/test_didier/test_utils/test_types/test_datetime.py
index 289285b..6582e99 100644
--- a/tests/test_didier/test_utils/test_types/test_datetime.py
+++ b/tests/test_didier/test_utils/test_types/test_datetime.py
@@ -28,6 +28,7 @@ def test_parse_dm_string_dm_garbage():
         parse_dm_string("AC/DC")
 
 
+@freeze_time("2022-09-11")
 def test_parse_dm_string_semantic():
     """Test parsing date strings in the [DAY] [MONTH] and [MONTH] [DAY] formats"""
     result = parse_dm_string("23rd november")