diff --git a/build_tools/__init__.py b/build_tools/__init__.py
index 3646f7fdd..5a5bfe4dd 100644
--- a/build_tools/__init__.py
+++ b/build_tools/__init__.py
@@ -11,4 +11,4 @@ def minimum_libsemigroups_version():
     """Returns the minimum required version of libsemigroups required to build
     libsemigroups_pybind11.
     """
-    return "3.5.5"
+    return "3.6.0"