diff --git a/requirements.txt b/requirements.txt
index 1b2e11d..817a986 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -1 +1 @@
-smmap>=3.0.1,<6
+smmap>=3.0.1,<7
diff --git a/setup.py b/setup.py
index 61b5727..a15a15b 100755
--- a/setup.py
+++ b/setup.py
@@ -20,7 +20,7 @@
     packages=('gitdb', 'gitdb.db', 'gitdb.utils', 'gitdb.test'),
     license="BSD License",
     zip_safe=False,
-    install_requires=['smmap>=3.0.1,<6'],
+    install_requires=['smmap>=3.0.1,<7'],
     long_description="""GitDB is a pure-Python git object database""",
     python_requires='>=3.7',
     # See https://pypi.python.org/pypi?%3Aaction=list_classifiers