diff --git a/CHANGES.md b/CHANGES.md
index 387848d..3dfe4e5 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,5 +1,10 @@
 # Changes
 
+## v0.45.1
+
+This is an empty release that was created solely to aid in pubsub's module
+carve-out. See: https://github.com/golang/go/wiki/Modules#is-it-possible-to-add-a-module-to-a-multi-module-repository.
+
 ## v0.45.0
 
 - compute/metadata:
diff --git a/go.mod b/go.mod
index 3922e65..caf0b37 100644
--- a/go.mod
+++ b/go.mod
@@ -17,7 +17,6 @@
 	golang.org/x/lint v0.0.0-20190409202823-959b441ac422
 	golang.org/x/net v0.0.0-20190620200207-3b0461eec859
 	golang.org/x/oauth2 v0.0.0-20190604053449-0f29369cfe45
-	golang.org/x/sync v0.0.0-20190423024810-112230192c58
 	golang.org/x/text v0.3.2
 	golang.org/x/time v0.0.0-20190308202827-9d24e82272b4
 	golang.org/x/tools v0.0.0-20190628153133-6cdbf07be9d0
diff --git a/pubsub/CHANGES.md b/pubsub/CHANGES.md
new file mode 100644
index 0000000..1b45c65
--- /dev/null
+++ b/pubsub/CHANGES.md
@@ -0,0 +1,6 @@
+# Changes
+
+## v1.0.0
+
+This is the first tag to carve out pubsub as its own module. See:
+https://github.com/golang/go/wiki/Modules#is-it-possible-to-add-a-module-to-a-multi-module-repository.
\ No newline at end of file
diff --git a/pubsub/go.mod b/pubsub/go.mod
new file mode 100644
index 0000000..a5567f7
--- /dev/null
+++ b/pubsub/go.mod
@@ -0,0 +1,17 @@
+module cloud.google.com/go/pubsub
+
+go 1.13
+
+require (
+	cloud.google.com/go v0.45.1
+	github.com/golang/protobuf v1.3.2
+	github.com/google/go-cmp v0.3.0
+	github.com/googleapis/gax-go/v2 v2.0.5
+	go.opencensus.io v0.22.0
+	golang.org/x/oauth2 v0.0.0-20190604053449-0f29369cfe45
+	golang.org/x/sync v0.0.0-20190423024810-112230192c58
+	golang.org/x/time v0.0.0-20190308202827-9d24e82272b4
+	google.golang.org/api v0.9.0
+	google.golang.org/genproto v0.0.0-20190819201941-24fa4b261c55
+	google.golang.org/grpc v1.21.1
+)
diff --git a/pubsub/go.sum b/pubsub/go.sum
new file mode 100644
index 0000000..a31819b
--- /dev/null
+++ b/pubsub/go.sum
@@ -0,0 +1,121 @@
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+cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
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+github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
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+honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
diff --git a/pubsub/go_mod_tidy_hack.go b/pubsub/go_mod_tidy_hack.go
new file mode 100644
index 0000000..376c518
--- /dev/null
+++ b/pubsub/go_mod_tidy_hack.go
@@ -0,0 +1,22 @@
+// Copyright 2019 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// This file, and the cloud.google.com/go import, won't actually become part of
+// the resultant binary.
+// +build modhack
+
+package datastore
+
+// Necessary for safely adding multi-module repo. See: https://github.com/golang/go/wiki/Modules#is-it-possible-to-add-a-module-to-a-multi-module-repository
+import _ "cloud.google.com/go"