diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 898d59398..614566a24 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -174,7 +174,7 @@ jobs:
 
       - name: Build BDist
         run: |
-          python -m pip install cibuildwheel==3.2.0
+          python -m pip install cibuildwheel==4.2.1
           python -m cibuildwheel --output-dir dist
 
       - name: Upload Artifact
diff --git a/ext/_ext.cmake b/ext/_ext.cmake
index 2fb39d804..ddf91868d 100644
--- a/ext/_ext.cmake
+++ b/ext/_ext.cmake
@@ -64,7 +64,7 @@ endif()
 
 # libtommath
 if(NOT TARGET libtommath)
-    add_sourcepp_remote_library(libtommath https://github.com/craftablescience/libtommath 03101d4556acd45175d5cfe0575601cf6acadef2 OVERRIDE_FIND_PACKAGE EXCLUDE_FROM_ALL)
+    add_sourcepp_remote_library(libtommath https://github.com/craftablescience/libtommath d0c643ffb76db2ff7592e8f0834f671d25cf8159 OVERRIDE_FIND_PACKAGE EXCLUDE_FROM_ALL)
 endif()
 
 
diff --git a/lang/python/cfg/pyproject.toml b/lang/python/cfg/pyproject.toml
index 589b9d348..2faa30eea 100644
--- a/lang/python/cfg/pyproject.toml
+++ b/lang/python/cfg/pyproject.toml
@@ -17,7 +17,6 @@ classifiers = [
 	"Topic :: File Formats",
 	"Programming Language :: C++",
 	"Programming Language :: Python :: 3 :: Only",
-	"Programming Language :: Python :: 3.9",
 	"Programming Language :: Python :: 3.10",
 	"Programming Language :: Python :: 3.11",
 	"Programming Language :: Python :: 3.12",
@@ -49,7 +48,7 @@ logging.level = "INFO"
 [tool.cibuildwheel]
 archs = ["auto64"]
 enable = ["pypy"]
-skip = "*-musllinux*"
+skip = ["cp39-*", "*-musllinux*"]
 
 [tool.cibuildwheel.linux]
 manylinux-x86_64-image       = 'manylinux_2_34'