diff --git a/.github/workflows/build_wheels.yml b/.github/workflows/build_wheels.yml
index 51de8fe5..11dea084 100644
--- a/.github/workflows/build_wheels.yml
+++ b/.github/workflows/build_wheels.yml
@@ -60,7 +60,7 @@ jobs:
         run: python -m cibuildwheel --output-dir wheelhouse
 
       - name: Build wheels
-        if: matrix.os == 'macos-14' && matrix.os == 'ubuntu-latest' && matrix.os == 'windows-latest'
+        if: matrix.os == 'macos-14' || matrix.os == 'ubuntu-latest' || matrix.os == 'windows-latest'
         env:
           MACOSX_DEPLOYMENT_TARGET: 14
           CIBW_BUILD: cp311-*
@@ -135,3 +135,20 @@ jobs:
       - name: Publish sdist to PyPI
         if: ${{ startsWith(github.ref, 'refs/tags/') }}
         uses: pypa/gh-action-pypi-publish@release/v1
+
+  test_wheels:
+    name: Test wheels on ${{ matrix.os }}
+    if: contains(github.event.head_commit.message, '[test_pypi]')
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ macos-11, macos-12, macos-13, macos-13-xlarge, macos-14, ubuntu-latest, windows-latest ]
+
+    steps:
+      - uses: actions/setup-python@v5
+
+      - name: install
+        run: pip python -m pip install -i https://test.pypi.org/simple/ --extra-index-url https://pypi.org/simple/ camb
+
+      - name: test
+        run: python -m unittest camb.tests.camb_test
diff --git a/camb/__init__.py b/camb/__init__.py
index b1a78dcf..3d25b813 100644
--- a/camb/__init__.py
+++ b/camb/__init__.py
@@ -7,7 +7,7 @@
 __author__ = "Antony Lewis"
 __contact__ = "antony at cosmologist dot info"
 __url__ = "https://camb.readthedocs.io"
-__version__ = "1.5.4.2"
+__version__ = "1.5.4.3"
 
 from . import baseconfig
 
diff --git a/fortran/config.f90 b/fortran/config.f90
index 3e9ece38..08c78423 100644
--- a/fortran/config.f90
+++ b/fortran/config.f90
@@ -3,7 +3,7 @@ module config
     use constants, only: const_twopi
     implicit none
 
-    character(LEN=*), parameter :: version = '1.5.4.2'
+    character(LEN=*), parameter :: version = '1.5.4.3'
 
     integer :: FeedbackLevel = 0 !if >0 print out useful information about the model