diff --git a/.github/actions/prepare_runner/action.yml b/.github/actions/prepare_runner/action.yml
index bdf175483..b74ed1def 100644
--- a/.github/actions/prepare_runner/action.yml
+++ b/.github/actions/prepare_runner/action.yml
@@ -11,7 +11,7 @@ runs:
       if: ${{ runner.os == 'macOS' }}
       shell: bash
       run: |
-          brew install llvm@14 pkg-config ninja bison cmake ccache jq gh conan@1
+          brew install llvm@14 pkg-config ninja bison cmake ccache jq gh conan@1 ca-certificates
           echo "/opt/homebrew/opt/conan@1/bin" >> $GITHUB_PATH
 
     - name: Fix git permissions on Linux
diff --git a/.github/actions/setup_conan/action.yml b/.github/actions/setup_conan/action.yml
index c7aa3c8ac..d77bfb90f 100644
--- a/.github/actions/setup_conan/action.yml
+++ b/.github/actions/setup_conan/action.yml
@@ -15,10 +15,10 @@ runs:
       if: ${{ runner.os == 'macOS' }}
       shell: bash
       env:
-        CONAN_PROFILE: apple_clang_15
+        CONAN_PROFILE: apple_clang_16
       id: conan_setup_mac
       run: |
-        echo "Creating $CONAN_PROFILE conan profile";
+        echo "Creating $CONAN_PROFILE conan profile"
         conan profile new $CONAN_PROFILE --detect --force
         conan profile update settings.compiler.libcxx=libc++ $CONAN_PROFILE
         conan profile update settings.compiler.cppstd=20 $CONAN_PROFILE
diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 4471bf5f3..e200a3ad3 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -74,7 +74,7 @@ jobs:
             conan_profile: clang
             code_coverage: false
             static: true
-          - os: macos14
+          - os: macos15
             build_type: Release
             code_coverage: false
             static: false
@@ -197,8 +197,8 @@ jobs:
               image: rippleci/clio_ci:latest
             conan_profile: clang
             build_type: Debug
-          - os: macos14
-            conan_profile: apple_clang_15
+          - os: macos15
+            conan_profile: apple_clang_16
             build_type: Release
     runs-on: [self-hosted, "${{ matrix.os }}"]
     container: ${{ matrix.container }}
diff --git a/.github/workflows/nightly.yml b/.github/workflows/nightly.yml
index 544064d13..080df1760 100644
--- a/.github/workflows/nightly.yml
+++ b/.github/workflows/nightly.yml
@@ -15,7 +15,7 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - os: macos14
+          - os: macos15
             build_type: Release
             static: false
           - os: heavy
@@ -90,7 +90,7 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - os: macos14
+          - os: macos15
             build_type: Release
             integration_tests: false
           - os: heavy