diff --git a/.github/workflows/cmake-multi-platform.yml b/.github/workflows/cmake-multi-platform.yml
index ce5dd21..d3aff61 100644
--- a/.github/workflows/cmake-multi-platform.yml
+++ b/.github/workflows/cmake-multi-platform.yml
@@ -36,7 +36,7 @@ jobs:
     steps:
     - uses: actions/checkout@v3
 
-    - name: Install Ninja
+    - name: Install Deps
       run: sudo apt install -y liblzma-dev ninja-build
 
     - name: Set reusable strings
diff --git a/cmake/external/googletest.cmake b/cmake/external/googletest.cmake
index 11d0fdf..0f9175b 100644
--- a/cmake/external/googletest.cmake
+++ b/cmake/external/googletest.cmake
@@ -44,7 +44,7 @@ include (ExternalProject)
 ExternalProject_Add(${GTEST_TARGET}
     PREFIX ${GTEST_TARGET}
     GIT_REPOSITORY https://github.com/google/googletest.git
-    GIT_TAG v1.14.0
+    GIT_TAG v1.15.0
     UPDATE_COMMAND ""
     CMAKE_CACHE_ARGS -DCMAKE_C_COMPILER:FILEPATH=${CMAKE_C_COMPILER}
                      -DCMAKE_CXX_COMPILER:FILEPATH=${CMAKE_CXX_COMPILER}
diff --git a/cmake/external/protobuf.cmake b/cmake/external/protobuf.cmake
index 7a74b9e..64ebdc6 100644
--- a/cmake/external/protobuf.cmake
+++ b/cmake/external/protobuf.cmake
@@ -152,7 +152,7 @@ include (ExternalProject)
 ExternalProject_Add(${PROTOBUF_TARGET}
     PREFIX ${PROTOBUF_TARGET}
     GIT_REPOSITORY https://github.com/google/protobuf.git
-    GIT_TAG v27.1
+    GIT_TAG v29.3
     UPDATE_COMMAND ""
     CONFIGURE_COMMAND ${CMAKE_COMMAND} ${PROTOBUF_INSTALL_DIR}/src/${PROTOBUF_TARGET}
         -G${CMAKE_GENERATOR}
diff --git a/examples/libfuzzer/libfuzzer_bin_example.cc b/examples/libfuzzer/libfuzzer_bin_example.cc
index 0734caa..62bb45a 100644
--- a/examples/libfuzzer/libfuzzer_bin_example.cc
+++ b/examples/libfuzzer/libfuzzer_bin_example.cc
@@ -55,7 +55,7 @@ DEFINE_BINARY_PROTO_FUZZER(const libfuzzer_example::Msg& message) {
       !std::isnan(message.optional_float()) &&
       std::fabs(message.optional_float()) > 1000 &&
       message.any().UnpackTo(&file) && !file.name().empty()) {
-    std::cerr << absl::StrCat(message) << "\n";
+    std::cerr << protobuf_mutator::protobuf::ShortFormat(message) << "\n";
     abort();
   }
 }
diff --git a/examples/libfuzzer/libfuzzer_example.cc b/examples/libfuzzer/libfuzzer_example.cc
index 37c4e6b..a7b9ba5 100644
--- a/examples/libfuzzer/libfuzzer_example.cc
+++ b/examples/libfuzzer/libfuzzer_example.cc
@@ -55,7 +55,7 @@ DEFINE_PROTO_FUZZER(const libfuzzer_example::Msg& message) {
       !std::isnan(message.optional_float()) &&
       std::fabs(message.optional_float()) > 1000 &&
       message.any().UnpackTo(&file) && !file.name().empty()) {
-    std::cerr << absl::StrCat(message) << "\n";
+    std::cerr << protobuf_mutator::protobuf::ShortFormat(message) << "\n";
     abort();
   }
 }
diff --git a/src/field_instance.h b/src/field_instance.h
index 8ffb745..823d19b 100644
--- a/src/field_instance.h
+++ b/src/field_instance.h
@@ -195,9 +195,9 @@ class ConstFieldInstance {
   const protobuf::FieldDescriptor* descriptor() const { return descriptor_; }
 
   std::string DebugString() const {
-    std::string s = absl::StrCat(*descriptor_);
-    if (is_repeated()) s += absl::StrCat("[", index_, "]");
-    return s + " of\n" + absl::StrCat(*message_);
+    std::string s = descriptor_->DebugString();
+    if (is_repeated()) s += "[" + std::to_string(index_) + "]";
+    return s + " of\n" + protobuf::ShortFormat(*message_);
   }
 
  protected:
diff --git a/src/mutator.cc b/src/mutator.cc
index 4fdcae4..191204e 100644
--- a/src/mutator.cc
+++ b/src/mutator.cc
@@ -801,7 +801,7 @@ std::string Mutator::MutateUtf8String(const std::string& value,
 
 bool Mutator::IsInitialized(const Message& message) const {
   if (!keep_initialized_ || message.IsInitialized()) return true;
-  std::cerr << "Uninitialized: " << absl::StrCat(message) << "\n";
+  std::cerr << "Uninitialized: " << protobuf::ShortFormat(message) << "\n";
   return false;
 }
 
diff --git a/src/mutator_test.cc b/src/mutator_test.cc
index 25a9b8a..8cd5013 100644
--- a/src/mutator_test.cc
+++ b/src/mutator_test.cc
@@ -410,8 +410,8 @@ bool Mutate(const protobuf::Message& from, const protobuf::Message& to,
   }
 
   ADD_FAILURE() << "Failed to get from:\n"
-                << absl::StrCat(from) << "\nto:\n"
-                << absl::StrCat(to);
+                << protobuf::ShortFormat(from) << "\nto:\n"
+                << protobuf::ShortFormat(to);
   return false;
 }