diff --git a/bazel/repository_locations.bzl b/bazel/repository_locations.bzl
index 71f0481f..f2685aae 100644
--- a/bazel/repository_locations.bzl
+++ b/bazel/repository_locations.bzl
@@ -6,19 +6,19 @@ REPOSITORY_LOCATIONS_SPEC = dict(
         project_url = "https://github.com/bazelbuild/bazel-skylib",
         version = "1.0.3",
         sha256 = "1c531376ac7e5a180e0237938a2536de0c54d93f5c278634818e0efc952dd56c",
-        urls = ["https://github.com/bazelbuild/bazel-skylib/releases/download/{version}/bazel-skylib-{version}.tar.gz"],
         release_date = "2020-08-27",
+        urls = ["https://github.com/bazelbuild/bazel-skylib/releases/download/{version}/bazel-skylib-{version}.tar.gz"],
         use_category = ["api"],
     ),
     com_envoyproxy_protoc_gen_validate = dict(
         project_name = "protoc-gen-validate (PGV)",
         project_desc = "protoc plugin to generate polyglot message validators",
         project_url = "https://github.com/envoyproxy/protoc-gen-validate",
-        version = "9db8e779b46119eef7d67e3d1120c118d593611c",
-        sha256 = "a3bfcf965499bfb17299a6931325eab653f99306dac413a5205e4b65e6ab027d",
+        version = "0.6.1",
+        sha256 = "c695fc5a2e5a1b52904cd8a58ce7a1c3a80f7f50719496fd606e551685c01101",
+        release_date = "2021-04-26",
         strip_prefix = "protoc-gen-validate-{version}",
-        urls = ["https://github.com/envoyproxy/protoc-gen-validate/archive/{version}.tar.gz"],
-        release_date = "2021-03-16",
+        urls = ["https://github.com/envoyproxy/protoc-gen-validate/archive/v{version}.tar.gz"],
         use_category = ["api"],
         implied_untracked_deps = [
             "com_github_iancoleman_strcase",
@@ -32,11 +32,11 @@ REPOSITORY_LOCATIONS_SPEC = dict(
         project_name = "Bazel build tools",
         project_desc = "Developer tools for working with Google's bazel buildtool.",
         project_url = "https://github.com/bazelbuild/buildtools",
-        version = "4.0.0",
-        sha256 = "0d3ca4ed434958dda241fb129f77bd5ef0ce246250feed2d5a5470c6f29a77fa",
-        strip_prefix = "buildtools-4.0.0",
-        urls = ["https://github.com/bazelbuild/buildtools/archive/4.0.0.tar.gz"],
-        release_date = "2021-02-04",
+        version = "4.0.1",
+        sha256 = "c28eef4d30ba1a195c6837acf6c75a4034981f5b4002dda3c5aa6e48ce023cf1",
+        release_date = "2021-03-01",
+        strip_prefix = "buildtools-{version}",
+        urls = ["https://github.com/bazelbuild/buildtools/archive/{version}.tar.gz"],
         use_category = ["api"],
     ),
     com_github_cncf_udpa = dict(
@@ -46,20 +46,20 @@ REPOSITORY_LOCATIONS_SPEC = dict(
         # During the UDPA -> xDS migration, we aren't working with releases.
         version = "b88cc788a63e5b38ee334a2e702c67901355ae2c",
         sha256 = "3220df8564f217665b6e17776569c5f748178c2b9cbf83bb55a13ddc0a3738f0",
+        release_date = "2021-03-23",
         strip_prefix = "xds-{version}",
         urls = ["https://github.com/cncf/xds/archive/{version}.tar.gz"],
-        release_date = "2021-03-23",
         use_category = ["api"],
     ),
     com_github_openzipkin_zipkinapi = dict(
         project_name = "Zipkin API",
         project_desc = "Zipkin's language independent model and HTTP Api Definitions",
         project_url = "https://github.com/openzipkin/zipkin-api",
-        version = "0.2.2",
-        sha256 = "688c4fe170821dd589f36ec45aaadc03a618a40283bc1f97da8fa11686fc816b",
+        version = "1.0.0",
+        sha256 = "6c8ee2014cf0746ba452e5f2c01f038df60e85eb2d910b226f9aa27ddc0e44cf",
+        release_date = "2020-11-22",
         strip_prefix = "zipkin-api-{version}",
         urls = ["https://github.com/openzipkin/zipkin-api/archive/{version}.tar.gz"],
-        release_date = "2019-08-23",
         use_category = ["api"],
     ),
     com_google_googleapis = dict(
@@ -69,9 +69,9 @@ REPOSITORY_LOCATIONS_SPEC = dict(
         project_url = "https://github.com/googleapis/googleapis",
         version = "82944da21578a53b74e547774cf62ed31a05b841",
         sha256 = "a45019af4d3290f02eaeb1ce10990166978c807cb33a9692141a076ba46d1405",
+        release_date = "2019-12-02",
         strip_prefix = "googleapis-{version}",
         urls = ["https://github.com/googleapis/googleapis/archive/{version}.tar.gz"],
-        release_date = "2019-12-02",
         use_category = ["api"],
     ),
     opencensus_proto = dict(
@@ -80,42 +80,42 @@ REPOSITORY_LOCATIONS_SPEC = dict(
         project_url = "https://github.com/census-instrumentation/opencensus-proto",
         version = "0.3.0",
         sha256 = "b7e13f0b4259e80c3070b583c2f39e53153085a6918718b1c710caf7037572b0",
+        release_date = "2020-07-21",
         strip_prefix = "opencensus-proto-{version}/src",
         urls = ["https://github.com/census-instrumentation/opencensus-proto/archive/v{version}.tar.gz"],
-        release_date = "2020-07-21",
         use_category = ["api"],
     ),
     prometheus_metrics_model = dict(
         project_name = "Prometheus client model",
         project_desc = "Data model artifacts for Prometheus",
         project_url = "https://github.com/prometheus/client_model",
-        version = "60555c9708c786597e6b07bf846d0dc5c2a46f54",
-        sha256 = "6748b42f6879ad4d045c71019d2512c94be3dd86f60965e9e31e44a3f464323e",
+        version = "0255a22d35ad5661ef7aa89c95fdf5dfd685283f",
+        sha256 = "a83fd26a80c5f9b82d1231448141a148c1d7a0c8f581ddf49fdbd8c1545e5661",
+        release_date = "2021-01-16",
         strip_prefix = "client_model-{version}",
         urls = ["https://github.com/prometheus/client_model/archive/{version}.tar.gz"],
-        release_date = "2020-06-23",
         use_category = ["api"],
     ),
     rules_proto = dict(
         project_name = "Protobuf Rules for Bazel",
         project_desc = "Protocol buffer rules for Bazel",
         project_url = "https://github.com/bazelbuild/rules_proto",
-        version = "40298556293ae502c66579620a7ce867d5f57311",
-        sha256 = "aa1ee19226f707d44bee44c720915199c20c84a23318bb0597ed4e5c873ccbd5",
+        version = "f7a30f6f80006b591fa7c437fe5a951eb10bcbcf",
+        sha256 = "9fc210a34f0f9e7cc31598d109b5d069ef44911a82f507d5a88716db171615a8",
+        release_date = "2021-02-09",
         strip_prefix = "rules_proto-{version}",
         urls = ["https://github.com/bazelbuild/rules_proto/archive/{version}.tar.gz"],
-        release_date = "2020-08-17",
         use_category = ["api"],
     ),
     opentelemetry_proto = dict(
         project_name = "OpenTelemetry Proto",
         project_desc = "Language Independent Interface Types For OpenTelemetry",
         project_url = "https://github.com/open-telemetry/opentelemetry-proto",
-        version = "0.7.0",
-        sha256 = "39cc1fb45039c7687354ca497aff8a55c71d0f1e484f6b81124ba9d821c36441",
+        version = "0.9.0",
+        sha256 = "9ec38ab51eedbd7601979b0eda962cf37bc8a4dc35fcef604801e463f01dcc00",
+        release_date = "2021-05-12",
         strip_prefix = "opentelemetry-proto-{version}",
         urls = ["https://github.com/open-telemetry/opentelemetry-proto/archive/v{version}.tar.gz"],
-        release_date = "2021-01-27",
         use_category = ["api"],
     ),
 )