diff --git a/.gitmodules b/.gitmodules
index 70653bf9e2..350885ac54 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -2,10 +2,6 @@
 	path = external/json
 	url = https://github.com/nlohmann/json.git
 	ignore = dirty
-[submodule "lib/googletest"]
-	path = external/googletest
-	url = https://github.com/google/googletest.git
-	branch = master
 [submodule "external/json-schema-validator"]
 	path = external/json-schema-validator
 	url = https://github.com/pboettch/json-schema-validator.git
diff --git a/lib/Utils/DOTGraph.cpp b/lib/Utils/DOTGraph.cpp
index f745336c22..1bd7dc7d30 100644
--- a/lib/Utils/DOTGraph.cpp
+++ b/lib/Utils/DOTGraph.cpp
@@ -18,11 +18,11 @@
 
 #include "nlohmann/json.hpp"
 
-#include <algorithm>
 #include <filesystem>
 #include <fstream>
 #include <iterator>
 #include <ostream>
+#include <sstream>
 #include <utility>
 
 namespace psr {