diff --git a/proto/BUILD.bazel b/proto/BUILD.bazel
index d311e59..ded1ae8 100644
--- a/proto/BUILD.bazel
+++ b/proto/BUILD.bazel
@@ -37,19 +37,6 @@ proto_library(
     deps = [":common_proto"],
 )
 
-proto_library(
-    name = "cached_dek_aead_proto",
-    srcs = ["cached_dek_aead.proto"],
-    visibility = ["//visibility:public"],
-)
-
-proto_library(
-    name = "cached_dek_envelope_proto",
-    srcs = ["cached_dek_envelope.proto"],
-    visibility = ["//visibility:public"],
-    deps = [":tink_proto"],
-)
-
 proto_library(
     name = "rsa_ssa_pss_proto",
     srcs = ["rsa_ssa_pss.proto"],
diff --git a/proto/cached_dek_aead.proto b/proto/cached_dek_aead.proto
deleted file mode 100644
index 9b1a33f..0000000
--- a/proto/cached_dek_aead.proto
+++ /dev/null
@@ -1,40 +0,0 @@
-// Copyright 2021 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.
-//
-////////////////////////////////////////////////////////////////////////////////
-
-syntax = "proto3";
-
-package google.crypto.tink;
-
-option java_package = "com.google.crypto.tink.proto";
-option java_multiple_files = true;
-option go_package = "github.com/google/tink/go/proto/cached_dek_aead_go_proto";
-
-message CachedDekAeadKeyFormat {
-  // Required.
-  // The location of a KMS key.
-  // With Google Cloud KMS, valid values have this format:
-  // gcp-kms://projects/*/locations/*/keyRings/*/cryptoKeys/*.
-  // With AWS KMS, valid values have this format:
-  // aws-kms://arn:aws:kms:<region>:<account-id>:key/<key-id>
-  string key_uri = 1;
-}
-
-// There is no actual key material in the key.
-message CachedDekAeadKey {
-  uint32 version = 1;
-  // The key format also contains the params.
-  CachedDekAeadKeyFormat params = 2;
-}
diff --git a/proto/cached_dek_envelope.proto b/proto/cached_dek_envelope.proto
deleted file mode 100644
index 627233c..0000000
--- a/proto/cached_dek_envelope.proto
+++ /dev/null
@@ -1,43 +0,0 @@
-// Copyright 2021 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.
-//
-////////////////////////////////////////////////////////////////////////////////
-
-syntax = "proto3";
-
-package google.crypto.tink;
-
-import "third_party/tink/proto/tink.proto";
-
-option java_multiple_files = true;
-option java_package = "com.google.crypto.tink.proto";
-option go_package = "github.com/google/tink/go/proto/cached_dek_envelope_go_proto";
-
-message CachedDekEnvelopeAeadKeyFormat {
-  // Required.
-  // The location of the KEK in a remote KMS.
-  // With Google Cloud KMS, valid values have this format:
-  // gcp-kms://projects/*/locations/*/keyRings/*/cryptoKeys/*.
-  // With AWS KMS, valid values have this format:
-  // aws-kms://arn:aws:kms:<region>:<account-id>:key/<key-id>
-  string kek_uri = 1;
-  // Key template of the Data Encryption Key, e.g., AesCtrHmacAeadKeyFormat.
-  // Required.
-  KeyTemplate dek_template = 2;
-}
-message CachedDekEnvelopeAeadKey {
-  uint32 version = 1;
-  // The key format also contains the params.
-  CachedDekEnvelopeAeadKeyFormat params = 2;
-}