diff --git a/third_party/protozero/.github/actions/build-windows/action.yml b/third_party/protozero/.github/actions/build-windows/action.yml
deleted file mode 100644
index 6f764c94e..000000000
--- a/third_party/protozero/.github/actions/build-windows/action.yml
+++ /dev/null
@@ -1,10 +0,0 @@
-name: Build on Windows
-
-runs:
-    using: composite
-    steps:
-      - name: Build
-        run: cmake --build . --config Release --verbose
-        shell: bash
-        working-directory: build
-
diff --git a/third_party/protozero/.github/actions/build/action.yml b/third_party/protozero/.github/actions/build/action.yml
deleted file mode 100644
index 9d1e9acf5..000000000
--- a/third_party/protozero/.github/actions/build/action.yml
+++ /dev/null
@@ -1,10 +0,0 @@
-name: Build
-
-runs:
-    using: composite
-    steps:
-      - name: Build
-        run: make VERBOSE=1
-        shell: bash
-        working-directory: build
-
diff --git a/third_party/protozero/.github/actions/cmake-windows/action.yml b/third_party/protozero/.github/actions/cmake-windows/action.yml
deleted file mode 100644
index 5ff0c6754..000000000
--- a/third_party/protozero/.github/actions/cmake-windows/action.yml
+++ /dev/null
@@ -1,12 +0,0 @@
-name: CMake on Windows
-
-runs:
-    using: composite
-    steps:
-      - name: Create build directory
-        run: mkdir build
-        shell: bash
-      - name: Configure
-        run: cmake -LA .. -DCMAKE_TOOLCHAIN_FILE=C:/vcpkg/scripts/buildsystems/vcpkg.cmake
-        shell: bash
-        working-directory: build
diff --git a/third_party/protozero/.github/actions/cmake/action.yml b/third_party/protozero/.github/actions/cmake/action.yml
deleted file mode 100644
index 3bb00ea16..000000000
--- a/third_party/protozero/.github/actions/cmake/action.yml
+++ /dev/null
@@ -1,16 +0,0 @@
-name: CMake
-
-runs:
-    using: composite
-    steps:
-      - name: Create build directory
-        run: mkdir build
-        shell: bash
-      - name: Configure
-        run: |
-          cmake -LA .. \
-            -DCMAKE_BUILD_TYPE=${BUILD_TYPE} \
-            -DPROTOZERO_DATA_VIEW=${PROTOZERO_DATA_VIEW} \
-            -DCMAKE_CXX_STANDARD=${CPP_VERSION}
-        shell: bash
-        working-directory: build
diff --git a/third_party/protozero/.github/actions/ctest-windows/action.yml b/third_party/protozero/.github/actions/ctest-windows/action.yml
deleted file mode 100644
index 64bc52dca..000000000
--- a/third_party/protozero/.github/actions/ctest-windows/action.yml
+++ /dev/null
@@ -1,10 +0,0 @@
-name: Test on Windows
-
-runs:
-    using: composite
-    steps:
-      - name: Test
-        run: ctest --output-on-failure -C Release
-        shell: bash
-        working-directory: build
-
diff --git a/third_party/protozero/.github/actions/ctest/action.yml b/third_party/protozero/.github/actions/ctest/action.yml
deleted file mode 100644
index 95bc1e6ce..000000000
--- a/third_party/protozero/.github/actions/ctest/action.yml
+++ /dev/null
@@ -1,10 +0,0 @@
-name: Test
-
-runs:
-    using: composite
-    steps:
-      - name: Test
-        run: ctest --output-on-failure
-        shell: bash
-        working-directory: build
-
diff --git a/third_party/protozero/.github/actions/install-ubuntu/action.yml b/third_party/protozero/.github/actions/install-ubuntu/action.yml
deleted file mode 100644
index 4904badb5..000000000
--- a/third_party/protozero/.github/actions/install-ubuntu/action.yml
+++ /dev/null
@@ -1,14 +0,0 @@
-name: Install Prerequisites on Ubuntu
-
-runs:
-  using: composite
-
-  steps:
-    - name: Install packages
-      run: |
-        sudo apt-get update -q
-        sudo apt-get install -yq \
-            libprotobuf-dev \
-            protobuf-compiler
-        if [ "$CC" = clang-13 ]; then sudo apt-get install -yq --no-install-suggests --no-install-recommends clang-13; fi
-      shell: bash