diff --git a/requirements.in b/requirements.in
index e34deb9..50e9155 100644
--- a/requirements.in
+++ b/requirements.in
@@ -14,7 +14,7 @@ joblib
 nmslib>=1.7.3.6; python_version < '3.11'
 # Use the metabrainz fork until nmslib supports installing on Python 3.11+
 # https://github.com/nmslib/nmslib/issues/555
-nmslib-metabrainz>=2.1.3; python_version >= '3.11'
+nmslib-metabrainz==2.1.3; python_version >= '3.11'
 scikit-learn>=0.20.3
 
 # Required for testing.
diff --git a/setup.py b/setup.py
index dcbee8b..e91457f 100644
--- a/setup.py
+++ b/setup.py
@@ -48,7 +48,7 @@
         "numpy",
         "joblib",
         "nmslib>=1.7.3.6; python_version < '3.11'",
-        "nmslib-metabrainz>=2.1.3; python_version >= '3.11'",
+        "nmslib-metabrainz==2.1.3; python_version >= '3.11'",
         "scikit-learn>=0.20.3",
         "pysbd",
     ],