--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -56,7 +56,7 @@
 #
 #
 if(${BUILD_TESTING})
-    add_subdirectory(ext/Catch2)
+    find_package(Catch2 3 REQUIRED)
     include(CTest)
     include(Catch)
     add_executable(fastANITest tests/fastani_tests.cpp src/cgi/core_genome_identity.cpp)