diff --git a/builders/macos-python-builder.psm1 b/builders/macos-python-builder.psm1
index c437eff1..8eb44bd6 100644
--- a/builders/macos-python-builder.psm1
+++ b/builders/macos-python-builder.psm1
@@ -50,10 +50,6 @@ class macOSPythonBuilder : NixPythonBuilder {
         ### will never be used itself by a Github Actions runner but using a universal2 Python is the only way to build
         ### universal2 C extensions and wheels. This is supported by Python >= 3.10 and was backported to Python >=
         ### 3.9.1 and >= 3.8.10.
-        ### Disabled, discussion: https://github.com/actions/python-versions/pull/114
-        # if ($this.Version -ge "3.8.10" -and $this.Version -ne "3.8.13" -and $this.Version -ne "3.9.0" ) {
-        #     $configureString += " --enable-universalsdk --with-universal-archs=universal2"
-        # }
 
         ### OS X 10.11, Apple no longer provides header files for the deprecated system version of OpenSSL.
         ### Solution is to install these libraries from a third-party package manager,
diff --git a/builders/ubuntu-python-builder.psm1 b/builders/ubuntu-python-builder.psm1
index 35b159c5..d83b2bc5 100644
--- a/builders/ubuntu-python-builder.psm1
+++ b/builders/ubuntu-python-builder.psm1
@@ -53,8 +53,8 @@ class UbuntuPythonBuilder : NixPythonBuilder {
         Prepare system environment by installing dependencies and required packages.
         #>
 
-        if ($this.Version -lt "3.5.3") {
-            Write-Host "Python versions lower than 3.5.3 are not supported"
+        if ($this.Version -lt "3.9.0") {
+            Write-Host "Python versions lower than 3.9.0 are not supported"
             exit 1
         }
 
diff --git a/tests/sources/python-modules.py b/tests/sources/python-modules.py
index 3b6873d2..8871d9ca 100644
--- a/tests/sources/python-modules.py
+++ b/tests/sources/python-modules.py
@@ -6,7 +6,7 @@
 import importlib
 import sys
 
-# The Python standard library as of Python 3.8
+# The Python standard library as of Python 3.9
 standard_library = [
     'abc',
     'aifc',
@@ -51,7 +51,6 @@
     'dis',
     'distutils',
     'doctest',
-    'dummy_threading',
     'email',
     'encodings',
     'ensurepip',
@@ -198,10 +197,6 @@
 
 # Add new modules
 # See https://docs.python.org/3/whatsnew/index.html
-# 'dummy_threading' module has been removed from Python 3.9
-if sys.version_info > (3, 8):
-    standard_library.remove('dummy_threading')
-
 # 'symbol' and 'formatter' modules have been removed from Python 3.10
 if sys.version_info >= (3, 10):
     standard_library.remove('symbol')