MLBEDSW-7490: Update documented python version to 3.9

Signed-off-by: Alexander Hansson <Alexander.Hansson@arm.com>
Change-Id: I0e8cd68c7dce47018551a89ef96941e27ec93eda
diff --git a/README.md b/README.md
index fe0f89b..5e3c419 100644
--- a/README.md
+++ b/README.md
@@ -63,9 +63,9 @@
 
 The following should be installed prior to the installation of Vela:
 
-* Python 3.7 or compatible
+* Python 3.9 or compatible
    - Development version containing the Python/C API header files
-   - e.g. `apt install python3.7-dev` or `yum install python37-devel`
+   - e.g. `apt install python3.9-dev` or `yum install python39-devel`
 * Pip3
 * A C99 capable compiler and associated toolchain
     - For Linux operating systems, a GNU toolchain is recommended.
@@ -222,7 +222,7 @@
 In the ethos-u-vela source directory, run:
 
 ```bash
-virtualenv -p 3.8 venv
+virtualenv -p 3.9 venv
 . venv/bin/activate
 pip install ethos-u-vela
 ```
diff --git a/pyproject.toml b/pyproject.toml
index 0c88abb..9332a3f 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -28,7 +28,7 @@
     "Operating System :: Microsoft :: Windows :: Windows 10",
     "Programming Language :: C",
     "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.7",
+    "Programming Language :: Python :: 3.9",
     "Topic :: Scientific/Engineering :: Artificial Intelligence",
     "Topic :: Software Development :: Compilers",
 ]