diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 120d3ce..bf05593 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -11,28 +11,9 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-22.04, windows-2022, macos-12, macos-14]
+        os: [macos-12]
         toolchain:
-          - { exe: gfortran, compiler: gcc, version: 13 }
           - { exe: ifort, compiler: intel-classic, version: "2021.10" }
-          - { exe: ifx, compiler: intel, version: "2023.2" }
-        exclude:
-          - os: macos-12
-            toolchain: { exe: ifx, compiler: intel, version: "2023.2" } # no support for macOS
-          - os: macos-12
-            toolchain: { exe: ifort, compiler: intel-classic, version: "2021.10" } # temporary disable due to error when building pycfml shared object:
-            # Undefined symbols for architecture x86_64:
-            #"_cfml_kvec_symmetry_mp_inlat_", referenced from:
-            #_cfml_kvec_symmetry_mp_latsym_ in libCrysFML08.a(ksym_auxsub.o)
-            #"_cfml_kvec_symmetry_mp_ltr_", referenced from:
-            #_cfml_kvec_symmetry_mp_latsym_ in libCrysFML08.a(ksym_auxsub.o)
-            #"_cfml_kvec_symmetry_mp_nlat_", referenced from:
-            #_cfml_kvec_symmetry_mp_latsym_ in libCrysFML08.a(ksym_auxsub.o)
-            #ld: symbol(s) not found for architecture x86_64
-          - os: macos-14
-            toolchain: { exe: ifx, compiler: intel, version: "2023.2" } # no support for macOS on arm64
-          - os: macos-14
-            toolchain: { exe: ifort, compiler: intel-classic, version: "2021.10" } # no support for macOS on arm64
 
     runs-on: ${{ matrix.os }}
 
@@ -191,28 +172,9 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        os: [ubuntu-22.04, windows-2022, macos-12, macos-14]
+        os: [macos-12]
         toolchain:
-          - { exe: gfortran, compiler: gcc, version: 13 }
           - { exe: ifort, compiler: intel-classic, version: "2021.10" }
-          - { exe: ifx, compiler: intel, version: "2023.2" }
-        exclude:
-          - os: macos-12
-            toolchain: { exe: ifx, compiler: intel, version: "2023.2" } # no support for macOS
-          - os: macos-12
-            toolchain: { exe: ifort, compiler: intel-classic, version: "2021.10" } # temporary disable due to error when building pycfml shared object:
-            # Undefined symbols for architecture x86_64:
-            #"_cfml_kvec_symmetry_mp_inlat_", referenced from:
-            #_cfml_kvec_symmetry_mp_latsym_ in libCrysFML08.a(ksym_auxsub.o)
-            #"_cfml_kvec_symmetry_mp_ltr_", referenced from:
-            #_cfml_kvec_symmetry_mp_latsym_ in libCrysFML08.a(ksym_auxsub.o)
-            #"_cfml_kvec_symmetry_mp_nlat_", referenced from:
-            #_cfml_kvec_symmetry_mp_latsym_ in libCrysFML08.a(ksym_auxsub.o)
-            #ld: symbol(s) not found for architecture x86_64
-          - os: macos-14
-            toolchain: { exe: ifx, compiler: intel, version: "2023.2" } # no support for macOS on arm64
-          - os: macos-14
-            toolchain: { exe: ifort, compiler: intel-classic, version: "2021.10" } # no support for macOS on arm64
 
     runs-on: ${{ matrix.os }}