diff --git a/setup.cfg b/setup.cfg
index 188b6c9914..f3f35a19c9 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -63,7 +63,15 @@ install_requires =
   backports.functools_lru_cache; python_version < '3.3'
   selectors2; python_version< '3.4'
   six>=1.11.0
-  more_itertools>=2.6
+  # NOTE: `more-itertools` has a bug in their package metadata. They
+  # NOTE: have dropped the testing of Python 3.5 from their CI but
+  # NOTE: forgot to state this in the distribution package metadata.
+  # NOTE: This is why we need these conditionals below.
+  # Refs:
+  # * https://github.com/more-itertools/more-itertools/issues/578
+  # * https://github.com/more-itertools/more-itertools/pull/579
+  more_itertools >= 2.6, < 8.11.0; python_version < '3.6'
+  more_itertools >= 2.6; python_version >= '3.6'
   jaraco.functools
 
 [options.extras_require]