diff --git a/ChangeLog.d/python3.8.txt b/ChangeLog.d/python3.8.txt
new file mode 100644
index 0000000..32a7c09
--- /dev/null
+++ b/ChangeLog.d/python3.8.txt
@@ -0,0 +1,2 @@
+Requirement changes
+   * Officially require Python 3.8 now that earlier versions are out of support.
diff --git a/README.md b/README.md
index 4ecdfa5..cbdb2df3 100644
--- a/README.md
+++ b/README.md
@@ -48,7 +48,7 @@
 
 * GNU Make 3.82 or a build tool that CMake supports.
 * A C99 toolchain (compiler, linker, archiver). We actively test with GCC 5.4, Clang 3.8, IAR 8 and Visual Studio 2013. More recent versions should work. Slightly older versions may work.
-* Python 3.6 to generate the test code, and to generate sample programs in the development branch.
+* Python 3.8 to generate the test code. Python is also needed to integrate PSA drivers and to build the development branch (see next section).
 * Perl to run the tests, and to generate some source files in the development branch.
 * CMake 3.10.2 or later (if using CMake).
 * Microsoft Visual Studio 2013 or later (if using Visual Studio).
@@ -61,7 +61,7 @@
 The following tools are required:
 
 * Perl, for some library source files and for Visual Studio build files.
-* Python 3 and some Python packages, for some library source files, sample programs and test data. To install the necessary packages, run:
+* Python 3.8 and some Python packages, for some library source files, sample programs and test data. To install the necessary packages, run:
     ```
     python3 -m pip install --user -r scripts/basic.requirements.txt
     ```