diff --git a/.gitignore b/.gitignore
index 8884dfa..1ce0f6c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,4 +8,5 @@ install_manifest.txt
 compile_commands.json
 CTestTestfile.cmake
 build
-.vscode
\ No newline at end of file
+.vscode
+.DS_Store
\ No newline at end of file
diff --git a/README.md b/README.md
index 7ae829d..c6448e9 100644
--- a/README.md
+++ b/README.md
@@ -120,17 +120,6 @@ CPMAddPackage(
 )
 ```
 
-### [Doctest](https://github.com/onqtam/doctest)
-
-```cmake
-CPMAddPackage(
-  NAME doctest
-  GITHUB_REPOSITORY onqtam/doctest
-  GIT_TAG 2.3.2
-)
-```
-
-
 ### [Boost (via boost-cmake)](https://github.com/Orphis/boost-cmake)
 
 ```CMake
@@ -141,6 +130,19 @@ CPMAddPackage(
 )
 ```
 
+### [cxxopts](https://github.com/jarro2783/cxxopts)
+
+```cmake
+CPMAddPackage(
+  NAME cxxopts
+  GITHUB_REPOSITORY jarro2783/cxxopts
+  VERSION 2.2.0
+  OPTIONS
+    "CXXOPTS_BUILD_EXAMPLES Off"
+    "CXXOPTS_BUILD_TESTS Off"
+)
+```
+
 ### [Yaml-cpp](https://github.com/jbeder/yaml-cpp)
 
 ```CMake
@@ -148,7 +150,7 @@ CPMAddPackage(
   NAME yaml-cpp
   GITHUB_REPOSITORY jbeder/yaml-cpp
   # 0.6.2 uses depricated CMake syntax
-  VERSION 0.6.3                                  
+  VERSION 0.6.3
   # 0.6.3 is not released yet, so use a recent commit
   GIT_TAG 012269756149ae99745b6dafefd415843d7420bb 
   OPTIONS
@@ -215,13 +217,12 @@ endif()
 CPMAddPackage(
   NAME lua
   GIT_REPOSITORY https://github.com/lua/lua.git
-  GIT_TAG v5-3-4
-  VERSION 5.3.4
+  VERSION 5.3.5
   DOWNLOAD_ONLY YES
 )
 
 if (lua_ADDED)
-  # lua has no CMakeLists, so we create our own target
+  # lua has no CMake support, so we create our own target
 
   FILE(GLOB lua_sources ${lua_SOURCE_DIR}/*.c)
   add_library(lua STATIC ${lua_sources})
diff --git a/examples/cxxopts/CMakeLists.txt b/examples/cxxopts/CMakeLists.txt
new file mode 100644
index 0000000..14c4617
--- /dev/null
+++ b/examples/cxxopts/CMakeLists.txt
@@ -0,0 +1,24 @@
+cmake_minimum_required(VERSION 3.14 FATAL_ERROR)
+
+# ---- Options ----
+
+option(ENABLE_TEST_COVERAGE "Enable test coverage" OFF)
+
+# ---- Dependencies ----
+
+include(../../cmake/CPM.cmake)
+
+CPMAddPackage(
+  NAME cxxopts
+  GITHUB_REPOSITORY jarro2783/cxxopts
+  VERSION 2.2.0
+  OPTIONS
+    "CXXOPTS_BUILD_EXAMPLES Off"
+    "CXXOPTS_BUILD_TESTS Off"
+)
+
+# ---- Create binary ----
+
+add_executable(CPMExampleCXXOpts main.cpp)
+target_link_libraries(CPMExampleCXXOpts cxxopts)
+set_target_properties(CPMExampleCXXOpts PROPERTIES CXX_STANDARD 17 COMPILE_FLAGS "-Wall -pedantic -Wextra -Werror")
diff --git a/examples/cxxopts/main.cpp b/examples/cxxopts/main.cpp
new file mode 100644
index 0000000..48f38e1
--- /dev/null
+++ b/examples/cxxopts/main.cpp
@@ -0,0 +1,23 @@
+#include <cxxopts.hpp>
+#include <iostream>
+
+int main(int argc, char ** argv) {
+  cxxopts::Options options("MyProgram", "One line description of MyProgram");
+  options.add_options()
+    ("h,help", "Show help")
+    ("d,debug", "Enable debugging")
+    ("f,file", "File name", cxxopts::value<std::string>());
+
+  auto result = options.parse(argc, argv);
+  
+  if (result["help"].as<bool>()) {
+    std::cout << options.help() << std::endl;
+    return 0;
+  }
+
+  for (auto arg: result.arguments()) {
+    std::cout << "option: " << arg.key() << ": " << arg.value() << std::endl;
+  }
+
+  return 0;
+}
diff --git a/examples/parser-lua/CMakeLists.txt b/examples/parser-lua/CMakeLists.txt
index 7c8f542..06d8f3a 100644
--- a/examples/parser-lua/CMakeLists.txt
+++ b/examples/parser-lua/CMakeLists.txt
@@ -7,7 +7,7 @@ include(../../cmake/CPM.cmake)
 CPMAddPackage(
   NAME Glue
   GIT_REPOSITORY https://github.com/TheLartians/Glue.git
-  VERSION 0.8.1
+  VERSION 0.8.2
   OPTIONS 
     "GLUE_ENABLE_LUA ON"
     "GLUE_BUILD_LUA ON"
diff --git a/examples/sol2/CMakeLists.txt b/examples/sol2/CMakeLists.txt
index dc8448b..e8d33fb 100644
--- a/examples/sol2/CMakeLists.txt
+++ b/examples/sol2/CMakeLists.txt
@@ -7,8 +7,7 @@ include(../../cmake/CPM.cmake)
 CPMAddPackage(
   NAME lua
   GIT_REPOSITORY https://github.com/lua/lua.git
-  VERSION 5.3.4
-  GIT_TAG v5-3-4
+  VERSION 5.3.5
   DOWNLOAD_ONLY YES
 )