diff --git a/.github/workflows/run-system-tests.yml b/.github/workflows/run-system-tests.yml
new file mode 100644
index 00000000..f7792194
--- /dev/null
+++ b/.github/workflows/run-system-tests.yml
@@ -0,0 +1,13 @@
+name: System tests
+
+on:
+  pull_request:
+    types: [labeled]
+
+jobs:
+  run-system-tests:
+    if: ${{ github.event.label.name == 'trigger-system-tests' }}
+    uses: precice/tutorials/.github/workflows/system-tests.yml@develop
+    with:
+      suites: python-bindings
+      build_args: PYTHON_BINDINGS_PR:${{ github.event.number }},PYTHON_BINDINGS_REF:${{ github.event.pull_request.head.sha }}
diff --git a/.gitignore b/.gitignore
index 833e4c93..cb1629ad 100644
--- a/.gitignore
+++ b/.gitignore
@@ -6,4 +6,4 @@ docs/_build
 docs/.docs_venv
 *.egg-info
 __pycache__
-env
+**/.venv
diff --git a/CHANGELOG.md b/CHANGELOG.md
index fcb0ccbc..553bc362 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,10 @@
 
 All notable changes to this project will be documented in this file.
 
+## 3.5.0
+
+* Fixed passing custom MPI communicators to the Participant https://github.com/precice/python-bindings/pull/256
+
 ## 3.4.0
 
 * Added support for documentation rendering https://github.com/precice/python-bindings/pull/250
diff --git a/cyprecice/cyprecice.pyx b/cyprecice/cyprecice.pyx
index db014b19..22159c84 100644
--- a/cyprecice/cyprecice.pyx
+++ b/cyprecice/cyprecice.pyx
@@ -63,7 +63,7 @@ cdef class Participant:
             Rank of the process
         solver_process_size : int
             Size of the process
-        communicator: mpi4py.MPI.Intracomm, optional
+        communicator: mpi4py.MPI.Comm, optional
             Custom MPI communicator to use
 
         Returns
@@ -82,10 +82,10 @@ cdef class Participant:
         pass
 
     def __cinit__ (self, solver_name, configuration_file_name, solver_process_index, solver_process_size, communicator=None):
-        cdef void* communicator_ptr
+        cdef size_t c_comm_addr;
         if communicator:
-            communicator_ptr = <void*> communicator
-            self.thisptr = new CppParticipant.Participant (convert(solver_name), convert(configuration_file_name), solver_process_index, solver_process_size, communicator_ptr)
+            c_comm_addr = MPI._addressof(communicator)
+            self.thisptr = new CppParticipant.Participant (convert(solver_name), convert(configuration_file_name), solver_process_index, solver_process_size, <void*>c_comm_addr)
         else:
             self.thisptr = new CppParticipant.Participant (convert(solver_name), convert(configuration_file_name), solver_process_index, solver_process_size)
         pass
diff --git a/docs/index.rst b/docs/index.rst
index 271e3e49..66c14eea 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -8,3 +8,8 @@ The preCICE python bindings
    precice
    MigrationGuide
    ReleaseGuide
+
+.. toctree::
+   :caption: External pages:
+
+   Coupling API overview <https://precice.org/couple-your-code-api.html>
diff --git a/examples/solverdummy/.gitignore b/examples/solverdummy/.gitignore
index 4f6df735..919dfbc4 100644
--- a/examples/solverdummy/.gitignore
+++ b/examples/solverdummy/.gitignore
@@ -3,3 +3,4 @@ venv
 .idea
 *.log
 __pycache__
+precice-profiling