diff --git a/.github/workflows/ci-conan.yml b/.github/workflows/ci-conan.yml
index 3903e4b1..da2e4652 100644
--- a/.github/workflows/ci-conan.yml
+++ b/.github/workflows/ci-conan.yml
@@ -126,6 +126,19 @@ jobs:
                 },
               lib: "libc++",
             }
+          - {
+              name: "Ubuntu Clang-15 + libc++",
+              os: ubuntu-20.04,
+              compiler:
+                {
+                  type: CLANG,
+                  version: 15,
+                  cc: "clang-15",
+                  cxx: "clang++-15",
+                  std: 20,
+                },
+              lib: "libc++",
+            }
           - {
               name: "MacOS Apple Clang 13",
               os: macos-11,
diff --git a/.github/workflows/ci-test-package-cmake.yml b/.github/workflows/ci-test-package-cmake.yml
index 7dfaa473..5ac33f34 100644
--- a/.github/workflows/ci-test-package-cmake.yml
+++ b/.github/workflows/ci-test-package-cmake.yml
@@ -130,6 +130,19 @@ jobs:
                 },
               lib: "libc++",
             }
+          - {
+              name: "Ubuntu Clang-15 + libc++",
+              os: ubuntu-20.04,
+              compiler:
+                {
+                  type: CLANG,
+                  version: 15,
+                  cc: "clang-15",
+                  cxx: "clang++-15",
+                  std: 20,
+                },
+              lib: "libc++",
+            }
           - {
               name: "MacOS Apple Clang 13",
               os: macos-11,