diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index a2d8e743ed..b926ca8ac0 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -10,14 +10,17 @@ jobs:
       matrix:
         os: [ubuntu-latest, windows-latest, macOS-latest]
         buildType: [RelWithDebInfo]
+        proactor: [default]
         include:
+        - os: ubuntu-latest
+          proactor: libuv
+          cmake_extra: '-DPROACTOR=libuv'
         - os: windows-latest
           cmake_extra: '-A x64 -DCMAKE_TOOLCHAIN_FILE=C:/vcpkg/scripts/buildsystems/vcpkg.cmake'
           cmake_generator: '-G "Visual Studio 16 2019"'
         - os: macOS-latest
           pkg_config_path: '/usr/local/opt/openssl@1.1/lib/pkgconfig'
           cmake_extra: '-DBUILD_RUBY=no -DTHREADERCISER=ON'
-          ctest_extra: '--exclude-regex c-threaderciser'
     env:
       BuildType: ${{matrix.buildType}}
       BuildDir: ${{github.workspace}}/BLD
@@ -49,7 +52,7 @@ jobs:
     - name: Install Linux dependencies
       if: runner.os == 'Linux'
       run: |
-        sudo apt install -y swig libpython3-dev libsasl2-dev libjsoncpp-dev
+        sudo apt install -y swig libpython3-dev libsasl2-dev libjsoncpp-dev libuv1-dev
     - name: Install Windows dependencies
       if: runner.os == 'Windows'
       run: |
diff --git a/.travis.yml b/.travis.yml
index 1f20dfa3b7..a9cdd61f31 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -64,7 +64,7 @@ jobs:
     # python-tox-test fails and ruby tests segfault
     - QPID_PROTON_CMAKE_ARGS='-DRUNTIME_CHECK=asan -DENABLE_TOX_TEST=OFF -DTHREADERCISER=ON'
     - QPID_PROTON_CTEST_ARGS='-E ^ruby.*'
-  - name: clang asan
+  - name: libuv clang asan
     os: linux
     dist: focal
     before_install:
@@ -73,7 +73,7 @@ jobs:
     - CC=clang-11
     - CXX=clang++-11
     - PYTHON=python3
-    - QPID_PROTON_CMAKE_ARGS='-DRUNTIME_CHECK=asan -DENABLE_TOX_TEST=OFF -DTHREADERCISER=ON'
+    - QPID_PROTON_CMAKE_ARGS='-DPROACTOR=libuv -DRUNTIME_CHECK=asan -DENABLE_TOX_TEST=OFF -DTHREADERCISER=ON'
     # otherwise, on Travis ldd gives `libclang_rt.asan-x86_64.so => not found` and binaries don't work
     - LD_LIBRARY_PATH=/usr/lib/llvm-11/lib/clang/11.0.0/lib/linux/
   - name: gcc tsan
@@ -88,6 +88,18 @@ jobs:
     # python-test, python-integration-test, and python-tox-test segfault
     - QPID_PROTON_CMAKE_ARGS='-DRUNTIME_CHECK=tsan -DENABLE_TOX_TEST=OFF -DTHREADERCISER=ON'
     - QPID_PROTON_CTEST_ARGS="-E 'python-test|python-integration-test'"
+  - name: gcc tsan libuv
+    os: linux
+    dist: focal
+    before_install:
+      - sudo apt-get install -y gcc-10 g++-10
+    env:
+      - CC=gcc-10
+      - CXX=g++-10
+      - PYTHON=python3
+      # python-test, python-integration-test, and python-tox-test segfault
+      - QPID_PROTON_CMAKE_ARGS='-DPROACTOR=libuv -DRUNTIME_CHECK=tsan -DENABLE_TOX_TEST=OFF -DTHREADERCISER=ON'
+      - QPID_PROTON_CTEST_ARGS="-E 'python-test|python-integration-test'"
   - name: coverage
     os: linux
     dist: bionic
@@ -127,6 +139,7 @@ addons:
   apt:
     packages:
     - cmake
+    - libuv1-dev
     - libssl-dev
     - libsasl2-dev
     - sasl2-bin