diff --git a/CHANGELOG.md b/CHANGELOG.md
index ce42aaf1df0..d373f0869c8 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -34,6 +34,7 @@
 - Def: Fixed compilation error in tests with Clang 21. (#6519)
 - Dev: Fixed compilation warnings on clang-cl. (#6528)
 - Dev: Fixed compilation error in tests with Clang 21. (#6519)
+- Dev: Use CMake's `FetchContent` for RapidJSON, PajladaSignals, PajladaSerialize, and PajladaSettings. (#6560)
 - Dev: The LuaLS meta files moved from `docs/plugin-meta.lua` to `docs/lua-meta/globals.lua`. (#6530)
 - Dev: Compile time definitions for `Windows.h` are now conditional based on `WIN32` instead of `MSVC`. (#6534)
 - Dev: Refactored split container nodes to use shared pointers. (#6435)
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 5cb3ad5894b..f3b0838dfb4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2,6 +2,7 @@ cmake_minimum_required(VERSION 3.15)
 cmake_policy(SET CMP0087 NEW) # evaluates generator expressions in `install(CODE/SCRIPT)`
 cmake_policy(SET CMP0091 NEW) # select MSVC runtime library through `CMAKE_MSVC_RUNTIME_LIBRARY`
 include(FeatureSummary)
+include(FetchContent)
 
 list(APPEND CMAKE_MODULE_PATH
     "${CMAKE_SOURCE_DIR}/cmake"
@@ -195,8 +196,6 @@ if (BUILD_WITH_QTKEYCHAIN)
     endif()
 endif()
 
-find_package(RapidJSON REQUIRED)
-
 find_package(Websocketpp REQUIRED)
 
 if (BUILD_TESTS)
@@ -224,23 +223,38 @@ if (BUILD_BENCHMARKS)
     find_package(benchmark REQUIRED)
 endif ()
 
-find_package(PajladaSerialize REQUIRED)
-find_package(PajladaSignals REQUIRED)
+FetchContent_Declare(
+    rapidjson
+    SOURCE_DIR ${CMAKE_CURRENT_LIST_DIR}/lib/rapidjson
+    EXCLUDE_FROM_ALL
+    FIND_PACKAGE_ARGS NAMES RapidJSON
+)
+set(RAPIDJSON_BUILD_EXAMPLES Off CACHE INTERNAL "")
+set(RAPIDJSON_BUILD_TESTS Off CACHE INTERNAL "")
+
+FetchContent_Declare(
+    PajladaSignals
+    SOURCE_DIR ${CMAKE_CURRENT_LIST_DIR}/lib/signals
+    EXCLUDE_FROM_ALL
+)
+FetchContent_Declare(
+    PajladaSerialize
+    SOURCE_DIR ${CMAKE_CURRENT_LIST_DIR}/lib/serialize
+    EXCLUDE_FROM_ALL
+)
+FetchContent_Declare(
+    PajladaSettings
+    SOURCE_DIR ${CMAKE_CURRENT_LIST_DIR}/lib/settings
+    EXCLUDE_FROM_ALL
+)
+
+FetchContent_MakeAvailable(rapidjson PajladaSignals PajladaSerialize PajladaSettings)
+
 find_package(LRUCache REQUIRED)
 find_package(MagicEnum REQUIRED)
 find_package(Doxygen)
 find_package(BoostCertify REQUIRED)
 
-if (USE_SYSTEM_PAJLADA_SETTINGS)
-    find_package(PajladaSettings REQUIRED)
-else()
-    if (NOT EXISTS "${CMAKE_SOURCE_DIR}/lib/settings/CMakeLists.txt")
-        message(FATAL_ERROR "Submodules probably not loaded, unable to find lib/settings/CMakeLists.txt")
-    endif()
-
-    add_subdirectory("${CMAKE_SOURCE_DIR}/lib/settings" EXCLUDE_FROM_ALL)
-endif()
-
 if (CHATTERINO_PLUGINS)
     set(LUA_INCLUDE_DIRS "${CMAKE_SOURCE_DIR}/lib/lua/src")
     add_subdirectory(lib/lua)
diff --git a/cmake/FindPajladaSerialize.cmake b/cmake/FindPajladaSerialize.cmake
deleted file mode 100644
index 4671874ce40..00000000000
--- a/cmake/FindPajladaSerialize.cmake
+++ /dev/null
@@ -1,14 +0,0 @@
-include(FindPackageHandleStandardArgs)
-
-find_path(PajladaSerialize_INCLUDE_DIR pajlada/serialize.hpp HINTS ${CMAKE_SOURCE_DIR}/lib/serialize/include)
-
-find_package_handle_standard_args(PajladaSerialize DEFAULT_MSG PajladaSerialize_INCLUDE_DIR)
-
-if (PajladaSerialize_FOUND)
-    add_library(Pajlada::Serialize INTERFACE IMPORTED)
-    set_target_properties(Pajlada::Serialize PROPERTIES
-            INTERFACE_INCLUDE_DIRECTORIES "${PajladaSerialize_INCLUDE_DIR}"
-            )
-endif ()
-
-mark_as_advanced(PajladaSerialize_INCLUDE_DIR)
diff --git a/cmake/FindPajladaSettings.cmake b/cmake/FindPajladaSettings.cmake
deleted file mode 100644
index d0d256bbb8e..00000000000
--- a/cmake/FindPajladaSettings.cmake
+++ /dev/null
@@ -1,16 +0,0 @@
-include(FindPackageHandleStandardArgs)
-
-find_path(PajladaSettings_INCLUDE_DIR pajlada/settings.hpp)
-find_library(PajladaSettings_LIBRARY PajladaSettings)
-
-find_package_handle_standard_args(PajladaSettings DEFAULT_MSG PajladaSettings_INCLUDE_DIR PajladaSettings_LIBRARY)
-
-if (PajladaSettings_FOUND)
-    add_library(Pajlada::Settings INTERFACE IMPORTED)
-    set_target_properties(Pajlada::Settings PROPERTIES
-            INTERFACE_INCLUDE_DIRECTORIES "${PajladaSettings_INCLUDE_DIR}"
-            INTERFACE_LINK_LIBRARIES "${PajladaSettings_LIBRARY}"
-            )
-endif ()
-
-mark_as_advanced(PajladaSettings_INCLUDE_DIR PajladaSettings_LIBRARY)
diff --git a/cmake/FindPajladaSignals.cmake b/cmake/FindPajladaSignals.cmake
deleted file mode 100644
index f4c964ecb94..00000000000
--- a/cmake/FindPajladaSignals.cmake
+++ /dev/null
@@ -1,14 +0,0 @@
-include(FindPackageHandleStandardArgs)
-
-find_path(PajladaSignals_INCLUDE_DIR pajlada/signals/signal.hpp HINTS ${CMAKE_SOURCE_DIR}/lib/signals/include)
-
-find_package_handle_standard_args(PajladaSignals DEFAULT_MSG PajladaSignals_INCLUDE_DIR)
-
-if (PajladaSignals_FOUND)
-    add_library(Pajlada::Signals INTERFACE IMPORTED)
-    set_target_properties(Pajlada::Signals PROPERTIES
-            INTERFACE_INCLUDE_DIRECTORIES "${PajladaSignals_INCLUDE_DIR}"
-            )
-endif ()
-
-mark_as_advanced(PajladaSignals_INCLUDE_DIR)
diff --git a/cmake/FindRapidJSON.cmake b/cmake/FindRapidJSON.cmake
deleted file mode 100644
index 57ec5b638c0..00000000000
--- a/cmake/FindRapidJSON.cmake
+++ /dev/null
@@ -1,14 +0,0 @@
-include(FindPackageHandleStandardArgs)
-
-find_path(RapidJSON_INCLUDE_DIR rapidjson/rapidjson.h HINTS ${CMAKE_SOURCE_DIR}/lib/rapidjson/include)
-
-find_package_handle_standard_args(RapidJSON DEFAULT_MSG RapidJSON_INCLUDE_DIR)
-
-if (RapidJSON_FOUND)
-    add_library(RapidJSON::RapidJSON INTERFACE IMPORTED)
-    set_target_properties(RapidJSON::RapidJSON PROPERTIES
-            INTERFACE_INCLUDE_DIRECTORIES "${RapidJSON_INCLUDE_DIR}"
-            )
-endif ()
-
-mark_as_advanced(RapidJSON_INCLUDE_DIR)
diff --git a/lib/rapidjson b/lib/rapidjson
index d87b698d0fc..24b5e7a8b27 160000
--- a/lib/rapidjson
+++ b/lib/rapidjson
@@ -1 +1 @@
-Subproject commit d87b698d0fcc10a5f632ecbc80a9cb2a8fa094a5
+Subproject commit 24b5e7a8b27f42fa16b96fc70aade9106cf7102f
diff --git a/lib/serialize b/lib/serialize
index 17946d65a41..bfbf3049243 160000
--- a/lib/serialize
+++ b/lib/serialize
@@ -1 +1 @@
-Subproject commit 17946d65a41a72b447da37df6e314cded9650c32
+Subproject commit bfbf304924328bd6fecfd7bf229434387351cc10
diff --git a/lib/settings b/lib/settings
index 9b5c05ee212..8620c426849 160000
--- a/lib/settings
+++ b/lib/settings
@@ -1 +1 @@
-Subproject commit 9b5c05ee2129e9eaa641d08a49096682105c2588
+Subproject commit 8620c426849a45040ade97111ab2bde72b1a7c9a
diff --git a/lib/signals b/lib/signals
index d06770649a7..4b127541d30 160000
--- a/lib/signals
+++ b/lib/signals
@@ -1 +1 @@
-Subproject commit d06770649a7e83db780865d09c313a876bf0f4eb
+Subproject commit 4b127541d30d9ae86df1553cb567cc2fc55fac46
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index a4c04de2962..739eaf5859c 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -873,6 +873,17 @@ if (CHATTERINO_GENERATE_COVERAGE)
         )
 endif ()
 
+if(TARGET rapidjson)
+    message(DEBUG "Linking to rapidjson target")
+    target_link_libraries(${LIBRARY_PROJECT} PUBLIC rapidjson)
+elseif(DEFINED RapidJSON_SOURCE_DIR)
+    message(DEBUG "RapidJSON_SOURCE_DIR defined, assuming this is a submodule/source build. (${RapidJSON_SOURCE_DIR})")
+    target_include_directories(${LIBRARY_PROJECT} SYSTEM PUBLIC ${RapidJSON_SOURCE_DIR}/include)
+else()
+    message(DEBUG "No rapidjson target found, this is most likely a system install. Adding include directories (${RAPIDJSON_INCLUDE_DIRS}) instead")
+    target_include_directories(${LIBRARY_PROJECT} SYSTEM PUBLIC ${RAPIDJSON_INCLUDE_DIRS})
+endif()
+
 target_link_libraries(${LIBRARY_PROJECT}
         PUBLIC
         Qt${MAJOR_QT_VERSION}::Core
@@ -888,7 +899,6 @@ target_link_libraries(${LIBRARY_PROJECT}
         Pajlada::Signals
         websocketpp::websocketpp
         Threads::Threads
-        RapidJSON::RapidJSON
         LRUCache
         MagicEnum
         $<$<BOOL:${WIN32}>:Wtsapi32>
@@ -1194,8 +1204,6 @@ target_link_libraries(${LIBRARY_PROJECT}
         OpenSSL::Crypto
         )
 
-target_include_directories(${LIBRARY_PROJECT} PUBLIC ${RapidJSON_INCLUDE_DIRS})
-
 if (LIBRT)
     target_link_libraries(${LIBRARY_PROJECT}
         PUBLIC
diff --git a/src/common/SignalVectorModel.hpp b/src/common/SignalVectorModel.hpp
index 6bd25f150e6..402cdc18fd0 100644
--- a/src/common/SignalVectorModel.hpp
+++ b/src/common/SignalVectorModel.hpp
@@ -18,9 +18,10 @@ template <typename T>
 struct SignalVectorItemEvent;
 
 template <typename TVectorItem>
-class SignalVectorModel : public QAbstractTableModel,
-                          pajlada::Signals::SignalHolder
+class SignalVectorModel : public QAbstractTableModel
 {
+    pajlada::Signals::SignalHolder signalHolder;
+
 public:
     SignalVectorModel(int columnCount, QObject *parent = nullptr)
         : QAbstractTableModel(parent)
@@ -66,9 +67,9 @@ class SignalVectorModel : public QAbstractTableModel,
             insert(args);
         }
 
-        this->managedConnect(vec->itemInserted, insert);
+        this->signalHolder.managedConnect(vec->itemInserted, insert);
 
-        this->managedConnect(vec->itemRemoved, [this](auto args) {
+        this->signalHolder.managedConnect(vec->itemRemoved, [this](auto args) {
             if (args.caller == this)
             {
                 return;