diff --git a/setup.py b/setup.py
index 9391851..00d5e45 100644
--- a/setup.py
+++ b/setup.py
@@ -14,7 +14,7 @@
 
 setup(
     name="nameko-grpc",
-    version="1.4.0rc3",
+    version="1.4.0rc4",
     description="Nameko gRPC extensions",
     long_description=readme,
     long_description_content_type="text/markdown",
@@ -27,7 +27,8 @@
         "grpcio",
         "protobuf",
         "googleapis-common-protos",
-        "importlib-metadata<5 ; python_version<='3.7'",
+        "importlib-metadata<5; python_version<='3.7'",
+        "importlib-metadata<7; python_version>'3.7'",
     ],
     extras_require={
         "dev": [