diff --git a/scripts/ci.requirements.txt b/scripts/ci.requirements.txt
new file mode 100644
index 0000000..18b40ec
--- /dev/null
+++ b/scripts/ci.requirements.txt
@@ -0,0 +1,10 @@
+# Python package requirements for Mbed TLS testing.
+
+# Use a known version of Pylint, because new versions tend to add warnings
+# that could start rejecting our code.
+# 2.4.4 is the version in Ubuntu 20.04. It supports Python >=3.5.
+pylint == 2.4.4
+
+# Use the earliest version of mypy that works with our code base.
+# See https://github.com/ARMmbed/mbedtls/pull/3953 .
+mypy >= 0.780
diff --git a/scripts/maintainer.requirements.txt b/scripts/maintainer.requirements.txt
new file mode 100644
index 0000000..670617b
--- /dev/null
+++ b/scripts/maintainer.requirements.txt
@@ -0,0 +1,6 @@
+# Python packages that are only useful to Mbed TLS maintainers.
+
+-r ci.requirements.txt
+
+# For source code analyses
+clang