diff --git a/src/llvm_state.cpp b/src/llvm_state.cpp
index af5fc6d6d..8d4f45ff8 100644
--- a/src/llvm_state.cpp
+++ b/src/llvm_state.cpp
@@ -293,7 +293,11 @@ llvm::orc::JITTargetMachineBuilder create_jit_tmb(unsigned opt_level, code_model
 #if defined(HEYOKA_ARCH_X86)
         code_model::small, code_model::kernel, code_model::medium, code_model::large
 #elif defined(HEYOKA_ARCH_ARM)
-        code_model::tiny, code_model::small, code_model::large
+    // NOTE: tiny code model not supported on OSX.
+#if !defined(__APPLE__)
+        code_model::tiny,
+#endif
+        code_model::small, code_model::large
 #elif defined(HEYOKA_ARCH_PPC)
         code_model::small, code_model::medium, code_model::large
 #else
diff --git a/test/llvm_state.cpp b/test/llvm_state.cpp
index 821524df3..8acd5929e 100644
--- a/test/llvm_state.cpp
+++ b/test/llvm_state.cpp
@@ -444,8 +444,8 @@ TEST_CASE("code model")
         REQUIRE(oss.str() == "small");
     }
 
-    // code_model::tiny not supported on x86 or ppc.
-#if defined(HEYOKA_ARCH_X86) || defined(HEYOKA_ARCH_PPC)
+    // code_model::tiny not supported on x86 or ppc or OSX
+#if defined(HEYOKA_ARCH_X86) || defined(HEYOKA_ARCH_PPC) || defined(__APPLE__)
 
     {
         std::ostringstream oss;
diff --git a/tools/gha_osx_arm64_static.sh b/tools/gha_osx_arm64_static.sh
index 165d9ae3a..78f9e45da 100644
--- a/tools/gha_osx_arm64_static.sh
+++ b/tools/gha_osx_arm64_static.sh
@@ -11,7 +11,7 @@ wget https://github.com/conda-forge/miniforge/releases/latest/download/Miniforge
 export deps_dir=$HOME/local
 export PATH="$HOME/miniconda/bin:$PATH"
 bash miniconda.sh -b -p $HOME/miniconda
-mamba create -y -p $deps_dir c-compiler zlib cxx-compiler libcxx cmake ninja \
+mamba create -y -p $deps_dir 'c-compiler<1.8' zlib 'cxx-compiler<1.8' libcxx cmake ninja \
     llvmdev tbb-devel tbb libboost-devel sleef xtensor xtensor-blas blas \
     blas-devel fmt spdlog 'mppp=1.*'
 source activate $deps_dir
diff --git a/tools/gha_osx_x86.sh b/tools/gha_osx_x86.sh
index eb1b8acfe..0fbdbbad2 100644
--- a/tools/gha_osx_x86.sh
+++ b/tools/gha_osx_x86.sh
@@ -11,7 +11,7 @@ wget https://github.com/conda-forge/miniforge/releases/latest/download/Miniforge
 export deps_dir=$HOME/local
 export PATH="$HOME/miniconda/bin:$PATH"
 bash miniconda.sh -b -p $HOME/miniconda
-mamba create -y -p $deps_dir c-compiler zlib cxx-compiler libcxx 'cmake>=3.18' ninja \
+mamba create -y -p $deps_dir 'c-compiler<1.8' zlib 'cxx-compiler<1.8' libcxx cmake ninja \
     llvmdev tbb-devel tbb libboost-devel sleef xtensor xtensor-blas blas \
     blas-devel fmt spdlog 'mppp=1.*'
 source activate $deps_dir
diff --git a/tools/gha_osx_x86_static.sh b/tools/gha_osx_x86_static.sh
index 05204731c..9d5c87e56 100644
--- a/tools/gha_osx_x86_static.sh
+++ b/tools/gha_osx_x86_static.sh
@@ -11,7 +11,7 @@ wget https://github.com/conda-forge/miniforge/releases/latest/download/Miniforge
 export deps_dir=$HOME/local
 export PATH="$HOME/miniconda/bin:$PATH"
 bash miniconda.sh -b -p $HOME/miniconda
-mamba create -y -p $deps_dir c-compiler zlib cxx-compiler libcxx 'cmake>=3.18' ninja \
+mamba create -y -p $deps_dir 'c-compiler<1.8' zlib 'cxx-compiler<1.8' libcxx cmake ninja \
     llvmdev tbb-devel tbb libboost-devel sleef xtensor xtensor-blas blas \
     blas-devel fmt spdlog 'mppp=1.*'
 source activate $deps_dir