diff --git a/.github/workflows/py-tests.yml b/.github/workflows/py-tests.yml
index 191e2e1929..013baea752 100644
--- a/.github/workflows/py-tests.yml
+++ b/.github/workflows/py-tests.yml
@@ -22,6 +22,7 @@ jobs:
     strategy:
       matrix:
         platform: ${{ (inputs.all-platforms && fromJSON('["ubuntu-latest", "macos-latest", "windows-latest"]')) || fromJSON('["ubuntu-latest"]') }}
+        python-version: ${{ (inputs.all-platforms && fromJSON('["3.10", "3.11"]')) || fromJSON('["3.11"]') }}
     runs-on: ${{ matrix.platform }}
     steps:
       - name: Check out lingua-franca repository
@@ -39,7 +40,7 @@ jobs:
       - name: Setup Python
         uses: actions/setup-python@v4
         with:
-          python-version: '3.10'
+          python-version: ${{ matrix.python-version }}
       - name: Install dependencies OS X
         run: |
           brew install coreutils
diff --git a/core/src/main/java/org/lflang/generator/python/PythonGenerator.java b/core/src/main/java/org/lflang/generator/python/PythonGenerator.java
index e4477d2d0d..b44436e3a3 100644
--- a/core/src/main/java/org/lflang/generator/python/PythonGenerator.java
+++ b/core/src/main/java/org/lflang/generator/python/PythonGenerator.java
@@ -480,9 +480,6 @@ protected void generateUserPreamblesForReactor(Reactor reactor, CodeBuilder src)
   @Override
   protected void generateReactorClassHeaders(
       TypeParameterizedReactor tpr, String headerName, CodeBuilder header, CodeBuilder src) {
-    header.pr(
-        PythonPreambleGenerator.generateCIncludeStatements(
-            targetConfig, targetLanguageIsCpp(), hasModalReactors));
     super.generateReactorClassHeaders(tpr, headerName, header, src);
   }
 
@@ -569,7 +566,7 @@ private static String setUpMainTarget(
             add_subdirectory(core)
             set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_SOURCE_DIR})
             set(LF_MAIN_TARGET <pyModuleName>)
-            find_package(Python 3.10.0...<3.11.0 REQUIRED COMPONENTS Interpreter Development)
+            find_package(Python 3.10.0...<3.12.0 REQUIRED COMPONENTS Interpreter Development)
             Python_add_library(
                 ${LF_MAIN_TARGET}
                 MODULE
diff --git a/core/src/main/java/org/lflang/generator/python/PythonPreambleGenerator.java b/core/src/main/java/org/lflang/generator/python/PythonPreambleGenerator.java
index 8194f78c63..692bf3d747 100644
--- a/core/src/main/java/org/lflang/generator/python/PythonPreambleGenerator.java
+++ b/core/src/main/java/org/lflang/generator/python/PythonPreambleGenerator.java
@@ -44,8 +44,8 @@ public static String generateCDefineDirectives(
   public static String generateCIncludeStatements(
       TargetConfig targetConfig, boolean CCppMode, boolean hasModalReactors) {
     CodeBuilder code = new CodeBuilder();
-    code.pr(CPreambleGenerator.generateIncludeStatements(targetConfig, CCppMode));
     code.pr("#include \"pythontarget.h\"");
+    code.pr(CPreambleGenerator.generateIncludeStatements(targetConfig, CCppMode));
     if (hasModalReactors) {
       code.pr("#include \"include/modal_models/definitions.h\"");
     }
diff --git a/core/src/main/java/org/lflang/generator/python/PythonReactionGenerator.java b/core/src/main/java/org/lflang/generator/python/PythonReactionGenerator.java
index cd008cba8d..6676995c6f 100644
--- a/core/src/main/java/org/lflang/generator/python/PythonReactionGenerator.java
+++ b/core/src/main/java/org/lflang/generator/python/PythonReactionGenerator.java
@@ -118,7 +118,6 @@ private static String generateCPythonFunctionCaller(
                 + " code again",
             "    }",
             "    " + PyUtil.generateGILReleaseCode(),
-            "    Py_FinalizeEx();",
             "    exit(1);",
             "}",
             "",
diff --git a/core/src/main/resources/lib/c/reactor-c b/core/src/main/resources/lib/c/reactor-c
index 5bbdefd558..eab52f47db 160000
--- a/core/src/main/resources/lib/c/reactor-c
+++ b/core/src/main/resources/lib/c/reactor-c
@@ -1 +1 @@
-Subproject commit 5bbdefd558b2504cd6fd8e881132b11efdce498b
+Subproject commit eab52f47db2a8b5c03ca2ab5509411a281c7f872