diff --git a/.github/workflows/cmake.yml b/.github/workflows/cmake.yml
index 3f2655a..787f384 100644
--- a/.github/workflows/cmake.yml
+++ b/.github/workflows/cmake.yml
@@ -19,6 +19,10 @@ on:
       - '**/README.md'
   workflow_dispatch:
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 env:
   CTEST_OUTPUT_ON_FAILURE: ON
   CTEST_PARALLEL_LEVEL: 2
diff --git a/.github/workflows/doc.yml b/.github/workflows/doc.yml
index 57d9d1f..3b202f9 100644
--- a/.github/workflows/doc.yml
+++ b/.github/workflows/doc.yml
@@ -13,6 +13,10 @@ on:
       - 'LICENSE'
   workflow_dispatch:
 
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
 jobs:
   build:
     name: Documentation
diff --git a/.gitignore b/.gitignore
index 1ad214d..d5180b2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -2,3 +2,4 @@
 *build*
 install
 docs
+.cache
diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 3788c8f..8dce5fa 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -9,6 +9,8 @@ if(NOT googletest_POPULATED)
     set(INSTALL_GTEST OFF CACHE BOOL "" FORCE)
     set(BUILD_SHARED_LIBS OFF CACHE BOOL "" FORCE)
     set(BUILD_GTEST_TESTS OFF CACHE BOOL "" FORCE)
+
+    # We need an older googletest version to be compatible with C++11
     FetchContent_Declare(googletest URL https://github.com/google/googletest/archive/refs/tags/release-1.12.1.zip
                                         DOWNLOAD_EXTRACT_TIMESTAMP TRUE)
     FetchContent_MakeAvailable(googletest)