diff --git a/.github/workflows/python-package.yml b/.github/workflows/python-package.yml
index c882a90..34a7698 100644
--- a/.github/workflows/python-package.yml
+++ b/.github/workflows/python-package.yml
@@ -17,7 +17,7 @@ jobs:
 
     strategy:
       matrix:
-        python-version: [ "3.10", "3.11", "3.12" ]
+        python-version: [ "3.9", "3.10", "3.11", "3.12" ]
 
     steps:
       - uses: actions/checkout@v4
diff --git a/CHANGES.md b/CHANGES.md
index a2abe2a..7248ff5 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -20,7 +20,7 @@
 
 # 0.3.0
 
-! Not Backwards compatable!
+! Not Backwards compatable !
 
 - Refactoring:
     - refactor the structure of the (internal) dicts: dict_series, dict_predicted. More logical and faster [#57]
@@ -28,7 +28,6 @@
     - removed deprecated loaders from codebase [#77]
     - simplify the core-functionalities of Aligner: process, predict, compare [#89]
     - cleanup unused functions [#81]
-    - requires python>=3.10
 
 - Functionalities:
     - Add brdr-version to formula [#66]
@@ -41,4 +40,10 @@
 - Bugfixing:
     - adding a safe_equals-function to catch GEOsException bug [#71]
 
-  
+
+
+
+
+
+
+
diff --git a/pyproject.toml b/pyproject.toml
index a6052cf..56a919b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -13,7 +13,7 @@ maintainers = [
     { name = "Koen Van Daele", email = "koen.vandaele@vlaanderen.be" },
     { name = "Vermeyen Maerten", email = "maarten.vermeyen@vlaanderen.be" }
 ]
-requires-python = ">=3.10"
+requires-python = ">=3.9"
 classifiers = [
     "Development Status :: 3 - Alpha",
     "License :: OSI Approved :: MIT License",
@@ -21,6 +21,7 @@ classifiers = [
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.9",
     "Topic :: Scientific/Engineering :: GIS",
 ]
 dependencies = [
@@ -57,4 +58,4 @@ build-backend = "hatchling.build"
 packages = ["brdr"]
 
 [tool.black]
-target-version = ['py310', 'py311', 'py312']
+target-version = ['py39', 'py310', 'py311', 'py312']