diff --git a/.github/workflows/ci-conan.yml b/.github/workflows/ci-conan.yml
index 569d4458..1525ed23 100644
--- a/.github/workflows/ci-conan.yml
+++ b/.github/workflows/ci-conan.yml
@@ -61,6 +61,12 @@ jobs:
             compiler: { type: CLANG, version: 12, cc: "clang-12", cxx: "clang++-12" },
             lib: "libc++"
           }
+        - {
+            name: "Ubuntu Clang 13.0.0 + libc++",
+            os: ubuntu-20.04,
+            compiler: { type: CLANG, version: 13, cc: "clang-13", cxx: "clang++-13" },
+            lib: "libc++"
+          }
         # In case a Conan docker image will be needed to provide a specific configuration we can use a Docker image as follows
         # - {
         #     name: "Ubuntu GCC 10.2.0",
@@ -89,7 +95,7 @@ jobs:
         if: matrix.config.compiler.type == 'CLANG' && matrix.config.lib == 'libc++'
         shell: bash
         run: |
-          sudo apt install -y libc++-${{ matrix.config.compiler.version }}-dev libc++abi-${{ matrix.config.compiler.version }}-dev
+          sudo apt install -y libc++-${{ matrix.config.compiler.version }}-dev libc++abi-${{ matrix.config.compiler.version }}-dev libunwind-${{ matrix.config.compiler.version }}-dev
       - name: Install Ninja
         # TODO Find a proper syntax to make the below work
         # if: !matrix.config.docker_image
@@ -120,6 +126,12 @@ jobs:
             conan profile update settings.compiler.libcxx=${{ matrix.config.lib }} default
           fi
           conan profile show default
+      - name: Add support for clang-13 to Conan's settings.yml
+        # TODO Remove when Conan will support clang-13
+        if: matrix.config.compiler.type == 'CLANG'
+        shell: bash
+        run: |
+          sed -i -e 's/"8", "9", "10", "11", "12"]/"8", "9", "10", "11", "12", "13"]/' ~/.conan/settings.yml
       - name: Run Conan Package Tools
         shell: bash
         env:
diff --git a/.github/workflows/ci-test-package-cmake.yml b/.github/workflows/ci-test-package-cmake.yml
index e97c43fa..f3342aa1 100644
--- a/.github/workflows/ci-test-package-cmake.yml
+++ b/.github/workflows/ci-test-package-cmake.yml
@@ -65,6 +65,12 @@ jobs:
             compiler: { type: CLANG, version: 12, cc: "clang-12", cxx: "clang++-12" },
             lib: "libc++"
           }
+        - {
+            name: "Ubuntu Clang 13.0.0 + libc++",
+            os: ubuntu-20.04,
+            compiler: { type: CLANG, version: 13, cc: "clang-13", cxx: "clang++-13" },
+            lib: "libc++"
+          }
         # In case a Conan docker image will be needed to provide a specific configuration we can use a Docker image as follows
         # - {
         #     name: "Ubuntu GCC 10.2.0",
@@ -105,7 +111,7 @@ jobs:
         if: matrix.config.compiler.type == 'CLANG' && matrix.config.lib == 'libc++'
         shell: bash
         run: |
-          sudo apt install -y libc++-${{ matrix.config.compiler.version }}-dev libc++abi-${{ matrix.config.compiler.version }}-dev
+          sudo apt install -y libc++-${{ matrix.config.compiler.version }}-dev libc++abi-${{ matrix.config.compiler.version }}-dev libunwind-${{ matrix.config.compiler.version }}-dev
       - name: Install Ninja
         # TODO Find a proper syntax to make the below work
         # if: !matrix.config.docker_image
@@ -138,6 +144,12 @@ jobs:
             conan profile update settings.compiler.libcxx=${{ matrix.config.lib }} default
           fi
           conan profile show default
+      - name: Add support for clang-13 to Conan's settings.yml
+        # TODO Remove when Conan will support clang-13
+        if: matrix.config.compiler.type == 'CLANG'
+        shell: bash
+        run: |
+          sed -i -e 's/"8", "9", "10", "11", "12"]/"8", "9", "10", "11", "12", "13"]/' ~/.conan/settings.yml
       - name: Install Conan dependencies
         shell: bash
         run: |
diff --git a/docs/framework/quantities.rst b/docs/framework/quantities.rst
index ea880ac2..9ad71b36 100644
--- a/docs/framework/quantities.rst
+++ b/docs/framework/quantities.rst
@@ -121,13 +121,19 @@ They are defined using the `reference` class template::
     namespace length_references {
 
     inline constexpr auto km = reference<dim_length, kilometre>{};
-    inline constexpr auto h = reference<dim_time, hour>{};
 
     }  // namespace length_references
 
+    namespace time_references {
+
+    inline constexpr auto h = reference<dim_time, hour>{};
+
+    }  // namespace time_references
+
     namespace references {
 
     using namespace length_references;
+    using namespace time_references;
 
     }  // namespace references
 
diff --git a/example/kalman_filter/kalman.h b/example/kalman_filter/kalman.h
index 3e416a8b..f78cc289 100644
--- a/example/kalman_filter/kalman.h
+++ b/example/kalman_filter/kalman.h
@@ -75,7 +75,7 @@ public:
   uncertainty_type uncertainty;
 };
 
-#if UNITS_COMP_CLANG == 12 || UNITS_COMP_MSVC
+#if UNITS_COMP_CLANG <= 13 || UNITS_COMP_MSVC
 
 template<QuantityOrQuantityPoint QQP, units::Quantity U>
 estimation(state<QQP>, U) -> estimation<QQP>;
diff --git a/src/core/include/units/bits/external/hacks.h b/src/core/include/units/bits/external/hacks.h
index 847293f5..20579827 100644
--- a/src/core/include/units/bits/external/hacks.h
+++ b/src/core/include/units/bits/external/hacks.h
@@ -66,9 +66,10 @@
 
 #endif
 
-#if UNITS_COMP_CLANG == 12 && UNITS_LIBCXX
+#if UNITS_LIBCXX
+
+#if UNITS_COMP_CLANG == 12
 
-#include <concepts/compare.hpp>
 #include <concepts/concepts.hpp>
 #include <range/v3/functional/comparisons.hpp>
 #include <range/v3/iterator.hpp>
@@ -76,6 +77,12 @@
 #include <range/v3/algorithm/lower_bound.hpp>
 #include <range/v3/algorithm/transform.hpp>
 
+#elif UNITS_COMP_CLANG == 13
+
+#include <range/v3/functional/comparisons.hpp>
+
+#endif
+
 #endif
 
 #include <concepts>
@@ -99,7 +106,9 @@ namespace std {
 template<class T>
 concept default_constructible = constructible_from<T>;
 
-#elif UNITS_COMP_CLANG && UNITS_LIBCXX
+#elif UNITS_LIBCXX
+
+#if UNITS_COMP_CLANG == 12
 
 // concepts
 using concepts::common_with;
@@ -209,6 +218,14 @@ constexpr bool in_range(T t) noexcept
         std::cmp_less_equal(t, std::numeric_limits<R>::max());
 }
 
+#elif UNITS_COMP_CLANG == 13
+
+using concepts::three_way_comparable;
+using concepts::three_way_comparable_with;
+using ::ranges::compare_three_way;
+
+#endif
+
 #endif
 
 } // namespace std