diff --git a/.github/workflows/build_wheels.yml b/.github/workflows/build_wheels.yml
index 5c8f3632..25cfaf8c 100644
--- a/.github/workflows/build_wheels.yml
+++ b/.github/workflows/build_wheels.yml
@@ -10,7 +10,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        os: [ macos-11, macos-12, macos-13, macos-14, ubuntu-latest, windows-latest ]
+        os: [ macos-11, macos-12, macos-13, macos-13-xlarge, macos-14, ubuntu-latest, windows-latest ]
 
     steps:
       - uses: awvwgk/setup-fortran@main
@@ -33,7 +33,7 @@ jobs:
         run: python -m pip install cibuildwheel==2.18.1
 
       - name: Build macos-13 wheels
-        if: matrix.os == 'macos-13'
+        if: matrix.os == 'macos-13' || matrix.os == 'macos-13-xlarge'
         env:
           MACOSX_DEPLOYMENT_TARGET: 13
           CIBW_BUILD: cp311-*
@@ -59,7 +59,7 @@ jobs:
         run: python -m cibuildwheel --output-dir wheelhouse
 
       - name: Build wheels
-        if: matrix.os != 'macos-13' && matrix.os != 'macos-12' && matrix.os != 'macos-11'
+        if: matrix.os == 'macos-14' && matrix.os == 'ubuntu-latest' && matrix.os == 'windows-latest'
         env:
           MACOSX_DEPLOYMENT_TARGET: 14
           CIBW_BUILD: cp311-*
diff --git a/camb/__init__.py b/camb/__init__.py
index 31478b57..9d8a2823 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__ = "1.5.5.dev.2"
+__version__ = "1.5.4.1"
 
 from . import baseconfig
 
diff --git a/fortran/config.f90 b/fortran/config.f90
index 2241f649..ecea7189 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 = '1.5.5.dev.2'
+    character(LEN=*), parameter :: version = '1.5.4.1'
 
     integer :: FeedbackLevel = 0 !if >0 print out useful information about the model