diff --git a/VERSION b/VERSION
index feaae22..b50dd27 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.13.0
+1.13.1
diff --git a/setup.py b/setup.py
index a56cd57..a62a99e 100644
--- a/setup.py
+++ b/setup.py
@@ -38,7 +38,8 @@
     packages = find_packages(where="python"),
     package_dir = {"": "python"},
     install_requires = [
-        "googleapis-common-protos==1.56.2"
+        "protobuf >=3.6.0, <4.0.0dev",
+        "googleapis-common-protos==1.52.0"
     ],
     include_package_data=True,
 )