diff --git a/.gitmodules b/.gitmodules
index 67187a8..865ff83 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,12 +1,12 @@
 [submodule "third_party/googletest"]
 	path = third_party/googletest
 	url = https://github.com/google/googletest.git
-[submodule "third_party/md5"]
-	path = third_party/md5
-	url = https://github.com/ulwanski/md5.git
 [submodule "third_party/tiny_thread_pool"]
 	path = third_party/tiny_thread_pool
 	url = https://github.com/dnomd343/tiny_thread_pool.git
 [submodule "third_party/abseil-cpp"]
 	path = third_party/abseil-cpp
 	url = https://github.com/abseil/abseil-cpp.git
+[submodule "third_party/md5sum"]
+	path = third_party/md5sum
+	url = https://github.com/dnomd343/md5sum.git
diff --git a/src/core_test/CMakeLists.txt b/src/core_test/CMakeLists.txt
index f8e9d42..7aa340e 100644
--- a/src/core_test/CMakeLists.txt
+++ b/src/core_test/CMakeLists.txt
@@ -6,15 +6,15 @@ include_directories(${KLOTSKI_ROOT_PATH}/third_party/googletest/googletest/inclu
 add_subdirectory(${KLOTSKI_ROOT_PATH}/third_party/googletest googletest EXCLUDE_FROM_ALL)
 
 #unset(CMAKE_ARCHIVE_OUTPUT_DIRECTORY)
-include_directories(${KLOTSKI_ROOT_PATH}/third_party/md5)
-add_library(md5 STATIC ${KLOTSKI_ROOT_PATH}/third_party/md5/md5.cpp)
+include_directories(${KLOTSKI_ROOT_PATH}/third_party/md5sum)
+#add_library(md5 STATIC ${KLOTSKI_ROOT_PATH}/third_party/md5/md5.cpp)
+add_subdirectory(${KLOTSKI_ROOT_PATH}/third_party/md5sum md5sum EXCLUDE_FROM_ALL)
 
-set(KLOTSKI_TEST_DEPS klotski-core gtest gtest_main md5)
+set(KLOTSKI_TEST_DEPS klotski-core gtest gtest_main md5sum)
 
 include_directories(${KLOTSKI_ROOT_PATH}/src/core/all_cases)
 include_directories(${KLOTSKI_ROOT_PATH}/src/core/utils)
 
-
 add_executable(test_klotski_cases cases/all_cases.cc)
 target_link_libraries(test_klotski_cases PRIVATE ${KLOTSKI_TEST_DEPS})
 add_test(NAME klotski_cases COMMAND test_klotski_cases)
diff --git a/src/core_test/cases/all_cases.cc b/src/core_test/cases/all_cases.cc
index addb4f2..c231396 100644
--- a/src/core_test/cases/all_cases.cc
+++ b/src/core_test/cases/all_cases.cc
@@ -3,7 +3,9 @@
 #include <vector>
 #include "gtest/gtest.h"
 #include "all_cases.h"
-#include "md5.h"
+#include "md5sum.h"
+
+using md5::md5sum;
 
 using klotski::cases::AllCases;
 using klotski::cases::BasicRanges;
@@ -46,7 +48,7 @@ TEST(Cases, basic_ranges_data) {
         asprintf(&tmp, "%08X\n", range);
         basic_ranges_str += tmp;
     }
-    EXPECT_EQ(md5(basic_ranges_str), BASIC_RANGES_MD5);
+    EXPECT_EQ(md5sum(basic_ranges_str), BASIC_RANGES_MD5);
 }
 
 TEST(Cases, all_cases_build) {
@@ -85,5 +87,5 @@ TEST(Cases, all_cases_data) {
             all_cases_str += tmp;
         }
     }
-    EXPECT_EQ(md5(all_cases_str), ALL_CASES_MD5);
+    EXPECT_EQ(md5sum(all_cases_str), ALL_CASES_MD5);
 }
diff --git a/third_party/md5 b/third_party/md5
deleted file mode 160000
index 2857560..0000000
--- a/third_party/md5
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 2857560d6466c7b1a89da93a075ebadf6991783e
diff --git a/third_party/md5sum b/third_party/md5sum
new file mode 160000
index 0000000..d58aa1e
--- /dev/null
+++ b/third_party/md5sum
@@ -0,0 +1 @@
+Subproject commit d58aa1e4eacff0e6086fe13ed435643b412d4c33