diff --git a/.github/workflows/test-build-publish.yml b/.github/workflows/test-build-publish.yml
index 30be574a1..715feb864 100644
--- a/.github/workflows/test-build-publish.yml
+++ b/.github/workflows/test-build-publish.yml
@@ -51,7 +51,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ['3.10', '3.11']
+        python-version: ['3.9', '3.10', '3.11']
 
     steps:
       - name: Checkout kapitan recursively
diff --git a/pyproject.toml b/pyproject.toml
index 053d40ccb..877a15a7b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -20,6 +20,7 @@ classifiers = [
     "Intended Audience :: Developers",
     "Topic :: Software Development :: Build Tools",
     "License :: OSI Approved :: Apache Software License",
+    "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
 ]
@@ -37,7 +38,7 @@ kapitan = 'kapitan.cli:main'
 source = "git-tag"
 
 [tool.poetry.dependencies]
-python = "^3.10"
+python = "^3.9"
 addict = "^2.4.0"
 azure-keyvault-keys = "^4.7.0"
 boto3 = "^1.18.17"