diff --git a/.github/workflows/main-check.yml b/.github/workflows/main-check.yml
index 9e0a184b..3cea81ed 100644
--- a/.github/workflows/main-check.yml
+++ b/.github/workflows/main-check.yml
@@ -12,7 +12,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-22.04]
-        python: ["3.9", "3.10", "3.11"]
+        python: ["3.10", "3.11", "3.12"]
 
     steps:
       - uses: actions/checkout@v4
diff --git a/.github/workflows/validate-pr.yml b/.github/workflows/validate-pr.yml
index dfeaa73b..985d3813 100644
--- a/.github/workflows/validate-pr.yml
+++ b/.github/workflows/validate-pr.yml
@@ -14,7 +14,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-22.04]
-        python: ["3.9", "3.10", "3.11", "3.12"]
+        python: ["3.10", "3.11", "3.12"]
 
     steps:
       - uses: actions/checkout@v4
@@ -110,7 +110,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-22.04]
-        python: ["3.9", "3.10", "3.11", "3.12"]
+        python: ["3.10", "3.11", "3.12"]
     steps:
       - uses: actions/setup-python@v5
         with:
diff --git a/.github/workflows/windows-subprocess-check.yml b/.github/workflows/windows-subprocess-check.yml
index e716a253..2c939ac5 100644
--- a/.github/workflows/windows-subprocess-check.yml
+++ b/.github/workflows/windows-subprocess-check.yml
@@ -10,7 +10,7 @@ jobs:
     strategy:
       matrix:
         os: [windows-latest]
-        python: ["3.9", "3.10", "3.11"]
+        python: ["3.10", "3.11", "3.12"]
 
     steps:
       - uses: actions/checkout@v4
diff --git a/changes/247.removed b/changes/247.removed
new file mode 100644
index 00000000..8a3d28ca
--- /dev/null
+++ b/changes/247.removed
@@ -0,0 +1 @@
+Drop Python 3.9 support.
diff --git a/pyproject.toml b/pyproject.toml
index fe761d5d..50bc55ab 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -12,7 +12,6 @@ path = "substrafl/__version__.py"
 name = "substrafl"
 classifiers = [
     "Operating System :: OS Independent",
-    "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
@@ -38,7 +37,7 @@ license = { file = "LICENSE" }
 
 description = """A high-level federated learning Python library to run
     federated learning experiments at scale on a Substra network"""
-requires-python = ">= 3.9"
+requires-python = ">= 3.10"
 
 [project.optional-dependencies]
 dev = [
diff --git a/substrafl/remote/register/register.py b/substrafl/remote/register/register.py
index dd1f51cf..f7170421 100644
--- a/substrafl/remote/register/register.py
+++ b/substrafl/remote/register/register.py
@@ -26,7 +26,7 @@
 
 # minimal and maximal values of Python 3 minor versions supported
 # we need to store this as integer, else "3.11" < "3.9" (string comparison)
-MINIMAL_PYTHON_VERSION = 9  # 3.9
+MINIMAL_PYTHON_VERSION = 10  # 3.10
 MAXIMAL_PYTHON_VERSION = 12  # 3.12
 
 _CPU_BASE_IMAGE = """
diff --git a/tests/installable_library/setup.py b/tests/installable_library/setup.py
index c003a2be..3348b980 100644
--- a/tests/installable_library/setup.py
+++ b/tests/installable_library/setup.py
@@ -8,5 +8,5 @@
     version="0.0.1",
     description="testlib",
     packages=find_packages(),
-    python_requires=">=3.9",
+    python_requires=">=3.10",
 )
diff --git a/tests/remote/register/test_register.py b/tests/remote/register/test_register.py
index 56c2bd3c..959eb014 100644
--- a/tests/remote/register/test_register.py
+++ b/tests/remote/register/test_register.py
@@ -32,13 +32,13 @@ def add_function(*args):
         pass
 
 
-@pytest.mark.parametrize("version", ["2.7", "3.7", "3.8", "3.18"])
+@pytest.mark.parametrize("version", ["2.7", "3.7", "3.8", "3.9", "3.18"])
 def test_check_python_version(version):
     with pytest.raises(UnsupportedPythonVersionError):
         register._check_python_version(version)
 
 
-@pytest.mark.parametrize("version", ["3.9", "3.10", "3.11", "3.12"])
+@pytest.mark.parametrize("version", ["3.10", "3.11", "3.12"])
 def test_check_python_version_valid(version):
     """Does not raise for supported versions"""
     register._check_python_version(version)