diff --git a/.github/workflows/checks.yml b/.github/workflows/checks.yml
index b976edcd..452481fb 100644
--- a/.github/workflows/checks.yml
+++ b/.github/workflows/checks.yml
@@ -47,6 +47,36 @@ jobs:
     - name: Validate pyproject.toml
       run: validate-pyproject pyproject.toml
 
+  test-minimum-requirements:
+    name: Test minimum requirements
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        python-version: ['3.9', '3.10', '3.11', '3.12', '3.13']
+
+    steps:
+    - name: Checkout repository
+      uses: actions/checkout@v4
+
+    - name: Setup Python ${{ matrix.python-version }}
+      uses: actions/setup-python@v5
+      with:
+        python-version: ${{ matrix.python-version }}
+
+    - name: Set minimum requirements
+      run: sed -i "/^\s/ s/>=/==/g" pyproject.toml
+
+    - name: Install xml2rfc
+      run: |
+        xargs -I {} pip --quiet uninstall -y "{}"
+        pip install .
+
+    - name: Sanity check
+      run: |
+        xml2rfc --version
+        xml2rfc --man > /dev/null
+
   tests-linux:
     name: Unit Tests (Linux)
     runs-on: ubuntu-latest
diff --git a/pyproject.toml b/pyproject.toml
index 8286df9a..38c66d15 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -25,17 +25,17 @@ classifiers = [
     "Programming Language :: Python :: 3.13"
 ]
 dependencies = [
-    "platformdirs>=3.6.0",
-    "configargparse>=1.2.3",
-    "google-i18n-address>=3.0.0",
-    "intervaltree>=3.1.0",
-    "jinja2>=3.1.2",
-    "lxml>=5.3.0",
-    "pycountry>=22.3.5",
-    "pyyaml>=5.3.1",
-    "requests>=2.5.0",
-    "setuptools>=24.2.0",
-    "wcwidth>=0.2.5"
+    "platformdirs==3.6.0",
+    "configargparse==1.2.3",
+    "google-i18n-address==3.0.0",
+    "intervaltree==3.1.0",
+    "jinja2==3.1.2",
+    "lxml==5.3.0",
+    "pycountry==23.12.7",
+    "pyyaml==5.3.1",
+    "requests==2.19.0",
+    "setuptools==24.2.0",
+    "wcwidth==0.2.5"
 ]
 
 [project.urls]