diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 8716d9c..532e78d 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -22,7 +22,7 @@ jobs:
     strategy:
       fail-fast: False
       matrix:
-        python-version: [ '3.9', '3.10', '3.11', '3.12' ]
+        python-version: [ '3.9', '3.10', '3.11', '3.12', '3.13' ]
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
@@ -91,7 +91,7 @@ jobs:
     strategy:
       matrix:
         os: [ windows-latest, ubuntu-latest, macos-latest, macos-14 ]
-        python-version: [ '3.9', '3.10', '3.11', '3.12' ]
+        python-version: [ '3.9', '3.10', '3.11', '3.12', '3.13' ]
 
     steps:
       - name: Checkout repository
diff --git a/extern/nlopt b/extern/nlopt
index 0b95472..75dd16e 160000
--- a/extern/nlopt
+++ b/extern/nlopt
@@ -1 +1 @@
-Subproject commit 0b954729dd8b0f1a227c3e4b7c8fe72d4f92c5ea
+Subproject commit 75dd16e147c265a70b14ee5cde6af943b576f726