diff --git a/appveyor.yml b/appveyor.yml
index b04ac24f2..0a7de686d 100644
--- a/appveyor.yml
+++ b/appveyor.yml
@@ -66,15 +66,15 @@ before_build:
   - cmake . -G "%GENERATOR%" -A "%GENERATOR_PLATFORM%" -DCMAKE_CXX_FLAGS="%CXX_FLAGS%" -DCMAKE_IGNORE_PATH="C:/Program Files/Git/usr/bin" -DJSON_BuildTests=On "%CMAKE_OPTIONS%"
 
 build_script:
-  - cmake --build . --config "%configuration%"
+  - cmake --build . --config "%configuration%" --parallel 2
 
 test_script:
-  - if "%configuration%"=="Release" ctest -C "%configuration%" -V -j
+  - if "%configuration%"=="Release" ctest -C "%configuration%" --parallel 2 --output-on-failure
   # On Debug builds, skip test-unicode_all
   # as it is extremely slow to run and cause
   # occasional timeouts on AppVeyor.
   # More info: https://github.com/nlohmann/json/pull/1570
-  - if "%configuration%"=="Debug" ctest --exclude-regex "test-unicode" -C "%configuration%" -V -j
+  - if "%configuration%"=="Debug" ctest --exclude-regex "test-unicode" -C "%configuration%" --parallel 2 --output-on-failure
 
 # only build PRs and commits to develop branch
 # (see https://help.appveyor.com/discussions/questions/55079-two-builds-per-commit-to-pull-request)
diff --git a/doc/mkdocs/docs/features/macros.md b/doc/mkdocs/docs/features/macros.md
index 9994c5dcd..dabb29917 100644
--- a/doc/mkdocs/docs/features/macros.md
+++ b/doc/mkdocs/docs/features/macros.md
@@ -125,6 +125,19 @@ security reasons (e.g., Intel Software Guard Extensions (SGX)).
     #undef JSON_NO_IO
     ```
 
+## `JSON_SKIP_LIBRARY_VERSION_CHECK`
+
+When defined, the library will not create a compiler warning when a different version of the library was already
+included.
+
+!!! info "Default behavior"
+
+    By default, the macro is not defined.
+
+    ```cpp
+    #undef JSON_SKIP_LIBRARY_VERSION_CHECK
+    ```
+
 ## `JSON_SKIP_UNSUPPORTED_COMPILER_CHECK`
 
 When defined, the library will not create a compile error when a known unsupported compiler is detected. This allows to
diff --git a/include/nlohmann/detail/conversions/from_json.hpp b/include/nlohmann/detail/conversions/from_json.hpp
index fbb176879..207d3e302 100644
--- a/include/nlohmann/detail/conversions/from_json.hpp
+++ b/include/nlohmann/detail/conversions/from_json.hpp
@@ -464,8 +464,7 @@ void from_json(const BasicJsonType& j, std_fs::path& p)
 {
     if (JSON_HEDLEY_UNLIKELY(!j.is_string()))
     {
-        // Not tested because of #3377 (related #3070)
-        JSON_THROW(type_error::create(302, "type must be string, but is " + std::string(j.type_name()), j)); // LCOV_EXCL_LINE
+        JSON_THROW(type_error::create(302, "type must be string, but is " + std::string(j.type_name()), j));
     }
     p = *j.template get_ptr<const typename BasicJsonType::string_t*>();
 }
diff --git a/include/nlohmann/json.hpp b/include/nlohmann/json.hpp
index 496007c0d..0c3c39065 100644
--- a/include/nlohmann/json.hpp
+++ b/include/nlohmann/json.hpp
@@ -39,6 +39,14 @@ SOFTWARE.
 #ifndef INCLUDE_NLOHMANN_JSON_HPP_
 #define INCLUDE_NLOHMANN_JSON_HPP_
 
+#ifndef JSON_SKIP_LIBRARY_VERSION_CHECK
+    #if defined(NLOHMANN_JSON_VERSION_MAJOR) && defined(NLOHMANN_JSON_VERSION_MINOR) && defined(NLOHMANN_JSON_VERSION_PATCH)
+        #if NLOHMANN_JSON_VERSION_MAJOR != 3 || NLOHMANN_JSON_VERSION_MINOR != 10 || NLOHMANN_JSON_VERSION_PATCH != 5
+            #warning "Already included a different version of the library!"
+        #endif
+    #endif
+#endif
+
 #define NLOHMANN_JSON_VERSION_MAJOR 3
 #define NLOHMANN_JSON_VERSION_MINOR 10
 #define NLOHMANN_JSON_VERSION_PATCH 5
diff --git a/single_include/nlohmann/json.hpp b/single_include/nlohmann/json.hpp
index 33a91164c..ed2a9cf2c 100644
--- a/single_include/nlohmann/json.hpp
+++ b/single_include/nlohmann/json.hpp
@@ -39,6 +39,14 @@ SOFTWARE.
 #ifndef INCLUDE_NLOHMANN_JSON_HPP_
 #define INCLUDE_NLOHMANN_JSON_HPP_
 
+#ifndef JSON_SKIP_LIBRARY_VERSION_CHECK
+    #if defined(NLOHMANN_JSON_VERSION_MAJOR) && defined(NLOHMANN_JSON_VERSION_MINOR) && defined(NLOHMANN_JSON_VERSION_PATCH)
+        #if NLOHMANN_JSON_VERSION_MAJOR != 3 || NLOHMANN_JSON_VERSION_MINOR != 10 || NLOHMANN_JSON_VERSION_PATCH != 5
+            #warning "Already included a different version of the library!"
+        #endif
+    #endif
+#endif
+
 #define NLOHMANN_JSON_VERSION_MAJOR 3
 #define NLOHMANN_JSON_VERSION_MINOR 10
 #define NLOHMANN_JSON_VERSION_PATCH 5
@@ -4279,8 +4287,7 @@ void from_json(const BasicJsonType& j, std_fs::path& p)
 {
     if (JSON_HEDLEY_UNLIKELY(!j.is_string()))
     {
-        // Not tested because of #3377 (related #3070)
-        JSON_THROW(type_error::create(302, "type must be string, but is " + std::string(j.type_name()), j)); // LCOV_EXCL_LINE
+        JSON_THROW(type_error::create(302, "type must be string, but is " + std::string(j.type_name()), j));
     }
     p = *j.template get_ptr<const typename BasicJsonType::string_t*>();
 }
diff --git a/test/src/unit-regression2.cpp b/test/src/unit-regression2.cpp
index b8cc5107b..dd2edb4ff 100644
--- a/test/src/unit-regression2.cpp
+++ b/test/src/unit-regression2.cpp
@@ -748,8 +748,10 @@ TEST_CASE("regression tests 2")
         const auto j_path = j.get<nlohmann::detail::std_fs::path>();
         CHECK(j_path == text_path);
 
-        // Disabled pending resolution of #3377
-        // CHECK_THROWS_WITH_AS(nlohmann::detail::std_fs::path(json(1)), "[json.exception.type_error.302] type must be string, but is number", json::type_error);
+#ifndef _MSC_VER
+        // works everywhere but on MSVC
+        CHECK_THROWS_WITH_AS(nlohmann::detail::std_fs::path(json(1)), "[json.exception.type_error.302] type must be string, but is number", json::type_error);
+#endif
     }
 #endif
 
diff --git a/third_party/amalgamate/amalgamate.py b/third_party/amalgamate/amalgamate.py
index f01b43b76..0aed7c901 100755
--- a/third_party/amalgamate/amalgamate.py
+++ b/third_party/amalgamate/amalgamate.py
@@ -1,4 +1,4 @@
-#!/usr/bin/env python
+#!/usr/bin/env python3
 # coding=utf-8
 
 # amalgamate.py - Amalgamate C source and header files.