diff --git a/gtk_qpong_app/ParticleImage.cpp b/gtk_qpong_app/ParticleImage.cpp
index d0ec47d087afab2d67538c818e6bde1c1b1de796..0c9a3db11b994b74442c5d255e87ea4f0d0c62b5 100644
--- a/gtk_qpong_app/ParticleImage.cpp
+++ b/gtk_qpong_app/ParticleImage.cpp
@@ -6,7 +6,6 @@
 #include "ParticleImage.hpp"
 #include "Common.hpp"
 
-#include "Profiler.hpp"
 
 constexpr int bytesPerPixel = 3;
 constexpr int bitsPerSample = 8;
diff --git a/libs/cpp_starter_project b/libs/cpp_starter_project
new file mode 160000
index 0000000000000000000000000000000000000000..d7a2b6b891d75edc68c9d88dca7e24cd73e378b8
--- /dev/null
+++ b/libs/cpp_starter_project
@@ -0,0 +1 @@
+Subproject commit d7a2b6b891d75edc68c9d88dca7e24cd73e378b8
diff --git a/libs/googletest b/libs/googletest
index e3f0319d89f4cbf32993de595d984183b1a9fc57..dcc92d0ab6c4ce022162a23566d44f673251eee4 160000
--- a/libs/googletest
+++ b/libs/googletest
@@ -1 +1 @@
-Subproject commit e3f0319d89f4cbf32993de595d984183b1a9fc57
+Subproject commit dcc92d0ab6c4ce022162a23566d44f673251eee4
diff --git a/libs/imgui b/libs/imgui
new file mode 160000
index 0000000000000000000000000000000000000000..ae93691360ad28e6c217138ead55c874dda26f80
--- /dev/null
+++ b/libs/imgui
@@ -0,0 +1 @@
+Subproject commit ae93691360ad28e6c217138ead55c874dda26f80
diff --git a/qpong_core/Particle.cpp b/qpong_core/Particle.cpp
index 0c27ae8d1b1b1610760d17313a4af06dbb85475e..a019f41f2f05751c2fea7beb882e5a2ec65d0fea 100644
--- a/qpong_core/Particle.cpp
+++ b/qpong_core/Particle.cpp
@@ -11,7 +11,6 @@
 
 #include "Common.hpp"
 #include "Particle.hpp"
-#include "Profiler.hpp"
 
 /// @brief Planck constant.
 ///