googleapis
diff --git a/‎setup.py
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+2-1Lines changed: 2 additions & 1 deletion b/‎setup.py
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+2-1Lines changed: 2 additions & 1 deletion
diff --git a/‎testing/constraints-3.6.txt
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+1Lines changed: 1 addition & 0 deletions b/‎testing/constraints-3.6.txt
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+1Lines changed: 1 addition & 0 deletions
@@ -32,7 +32,8 @@
     # Until this issue is closed
     # https://github.com/googleapis/google-cloud-python/issues/10566
     "google-api-core[grpc] >= 1.31.5, <3.0.0dev,!=2.0.*,!=2.1.*,!=2.2.*,!=2.3.0",
-    "proto-plus >= 1.15.0",
+    "proto-plus >= 1.15.0, <2.0.0dev",
+    "protobuf >= 3.19.0, <4.0.0dev",
 ]
 extras = {"libcst": "libcst >= 0.2.5"}
 
 
@@ -8,3 +8,4 @@
 google-api-core==1.31.5
 proto-plus==1.15.0
 libcst==0.2.5
+protobuf==3.19.0