diff --git a/Changelog.md b/Changelog.md
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--- /dev/null
+++ b/Changelog.md
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+# Changelog for `proto-lens-runtime`
+
+## v0.4.0.0
+- Split out from `proto-lens-protoc`.
+- Use simplified lens-labels instances. (#208)
+
+## Older
+See `Changelog.md` for `proto-lens-protoc`.
diff --git a/LICENSE b/LICENSE
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--- /dev/null
+++ b/LICENSE
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+Copyright (c) 2016, Google Inc.
+
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without
+modification, are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+
+    * Redistributions in binary form must reproduce the above
+      copyright notice, this list of conditions and the following
+      disclaimer in the documentation and/or other materials provided
+      with the distribution.
+
+    * Neither the name of Google Inc. nor the names of other
+      contributors may be used to endorse or promote products derived
+      from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
diff --git a/proto-lens-runtime.cabal b/proto-lens-runtime.cabal
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--- /dev/null
+++ b/proto-lens-runtime.cabal
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+-- This file has been generated from package.yaml by hpack version 0.28.2.
+--
+-- see: https://github.com/sol/hpack
+--
+-- hash: 6f3d113eb5e7a24246b7511da1032022b63c39a76df5616230792fb12b94bafa
+
+name:           proto-lens-runtime
+version:        0.4.0.0
+description:    Modules that are needed by the Haskell files generated by proto-lens-protoc. For forwards compatibility, we reexport them as new module names so that other packages don't accidentally write non-generated code that relies on these modules being reexported by this package.
+homepage:       https://github.com/google/proto-lens#readme
+bug-reports:    https://github.com/google/proto-lens/issues
+author:         Judah Jacobson
+maintainer:     proto-lens@googlegroups.com
+copyright:      Google Inc.
+license:        BSD3
+license-file:   LICENSE
+build-type:     Simple
+cabal-version:  >= 1.22
+extra-source-files:
+    Changelog.md
+
+source-repository head
+  type: git
+  location: https://github.com/google/proto-lens
+  subdir: proto-lens-runtime
+
+library
+  other-modules:
+      Paths_proto_lens_runtime
+  reexported-modules:
+      Prelude as Data.ProtoLens.Runtime.Prelude,
+      Control.DeepSeq as Data.ProtoLens.Runtime.Control.DeepSeq,
+      Data.Int as Data.ProtoLens.Runtime.Data.Int,
+      Data.Word as Data.ProtoLens.Runtime.Data.Word,
+      Data.ByteString as Data.ProtoLens.Runtime.Data.ByteString,
+      Data.ByteString.Char8 as Data.ProtoLens.Runtime.Data.ByteString.Char8,
+      Data.Map as Data.ProtoLens.Runtime.Data.Map,
+      Data.ProtoLens as Data.ProtoLens.Runtime.Data.ProtoLens,
+      Data.ProtoLens.Service.Types as Data.ProtoLens.Runtime.Data.ProtoLens.Service.Types,
+      Data.ProtoLens.Message.Enum as Data.ProtoLens.Runtime.Data.ProtoLens.Message.Enum,
+      Data.Text as Data.ProtoLens.Runtime.Data.Text,
+      Lens.Family2 as Data.ProtoLens.Runtime.Lens.Family2,
+      Lens.Family2.Unchecked as Data.ProtoLens.Runtime.Lens.Family2.Unchecked,
+      Lens.Labels as Data.ProtoLens.Runtime.Lens.Labels,
+      Lens.Labels.Prism as Data.ProtoLens.Runtime.Lens.Labels.Prism,
+      Text.Read as Data.ProtoLens.Runtime.Text.Read
+  build-depends:
+      base >=4.9 && <4.12
+    , bytestring ==0.10.*
+    , containers ==0.5.*
+    , data-default-class >=0.0 && <0.2
+    , deepseq ==1.4.*
+    , filepath >=1.4 && <1.6
+    , lens-family ==1.2.*
+    , lens-labels ==0.3.*
+    , proto-lens ==0.4.*
+    , text ==1.2.*
+  default-language: Haskell2010