diff --git a/.bazeliskrc b/.bazeliskrc
index a77e0c8..89b6466 100644
--- a/.bazeliskrc
+++ b/.bazeliskrc
@@ -1,2 +1 @@
-USE_BAZEL_VERSION=7.7.0
-
+USE_BAZEL_VERSION=6.5.0
diff --git a/.bazelrc b/.bazelrc
index 8ff7832..b19922f 100644
--- a/.bazelrc
+++ b/.bazelrc
@@ -1,6 +1,3 @@
-# Disable Bazel modules (for now).
-common --enable_bzlmod=false
-
 # Specific Bazel build/test options.
 build:macos --cxxopt='-std=c++17' --host_cxxopt='-std=c++17'
 
diff --git a/WORKSPACE.bazel b/WORKSPACE.bazel
index a95cdc1..bdabe67 100644
--- a/WORKSPACE.bazel
+++ b/WORKSPACE.bazel
@@ -2,11 +2,7 @@ workspace(name = "com_github_3rdparty_stout")
 
 load("//bazel:repos.bzl", "repos")
 
-repos()
-
-load("@rules_python//python:repositories.bzl", "py_repositories")
-
-py_repositories()
+repos(external = False)
 
 load("//bazel:deps.bzl", "deps")
 
diff --git a/bazel/deps.bzl b/bazel/deps.bzl
index fb9e29a..8502806 100644
--- a/bazel/deps.bzl
+++ b/bazel/deps.bzl
@@ -1,16 +1,34 @@
 """Dependency specific initialization for stout."""
 
+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
 load("@com_github_3rdparty_bazel_rules_picojson//bazel:deps.bzl", picojson_deps = "deps")
 load("@com_github_3rdparty_bazel_rules_rapidjson//bazel:deps.bzl", rapidjson_deps = "deps")
 load("@com_github_nelhage_rules_boost//:boost/boost.bzl", "boost_deps")
 load("@com_google_protobuf//:protobuf_deps.bzl", "protobuf_deps")
 
-def deps():
-    """Propagate all dependencies."""
+def deps(repo_mapping = {}):
+    """Propagate all dependencies.
+
+    Args:
+        repo_mapping (str): {}.
+    """
     boost_deps()
 
-    picojson_deps()
+    picojson_deps(
+        repo_mapping = repo_mapping,
+    )
+
+    rapidjson_deps(
+        repo_mapping = repo_mapping,
+    )
 
-    rapidjson_deps()
+    # Needed because protobuf_deps brings rules_python 0.26.0 which is broken:
+    # https://github.com/bazelbuild/rules_python/issues/1543
+    http_archive(
+        name = "rules_python",
+        sha256 = "5868e73107a8e85d8f323806e60cad7283f34b32163ea6ff1020cf27abef6036",
+        strip_prefix = "rules_python-0.25.0",
+        url = "https://github.com/bazelbuild/rules_python/releases/download/0.25.0/rules_python-0.25.0.tar.gz",
+    )
 
     protobuf_deps()
diff --git a/bazel/repos.bzl b/bazel/repos.bzl
index 62126e6..d21e564 100644
--- a/bazel/repos.bzl
+++ b/bazel/repos.bzl
@@ -15,28 +15,21 @@ load("@bazel_tools//tools/build_defs/repo:utils.bzl", "maybe")
 load("//3rdparty/bazel-rules-picojson:repos.bzl", picojson_repos = "repos")
 load("//3rdparty/bazel-rules-rapidjson:repos.bzl", rapidjson_repos = "repos")
 
-def repos():
-    """Adds repositories/archives needed by stout."""
-    picojson_repos()
+def repos(external = True, repo_mapping = {}):
+    """Adds repositories/archives needed by stout
 
-    rapidjson_repos()
-
-    maybe(
-        http_archive,
-        name = "rules_python",
-        sha256 = "4f7e2aa1eb9aa722d96498f5ef514f426c1f55161c3c9ae628c857a7128ceb07",
-        strip_prefix = "rules_python-1.0.0",
-        url = "https://github.com/bazelbuild/rules_python/releases/download/1.0.0/rules_python-1.0.0.tar.gz",
+    Args:
+          external: whether or not we're invoking this function as though
+            though we're an external dependency
+          repo_mapping: passed through to all other functions that expect/use
+            repo_mapping, e.g., 'git_repository'
+    """
+    picojson_repos(
+        repo_mapping = repo_mapping,
     )
 
-    maybe(
-        http_archive,
-        name = "com_google_protobuf",
-        sha256 = "955ef3235be41120db4d367be81efe6891c9544b3a71194d80c3055865b26e09",
-        strip_prefix = "protobuf-29.5",
-        urls = [
-            "https://github.com/protocolbuffers/protobuf/archive/v29.5.tar.gz",
-        ],
+    rapidjson_repos(
+        repo_mapping = repo_mapping,
     )
 
     maybe(
@@ -82,9 +75,20 @@ def repos():
     maybe(
         http_archive,
         name = "com_github_google_glog",
-        sha256 = "c17d85c03ad9630006ef32c7be7c65656aba2e7e2fbfc82226b7e680c771fc88",
-        strip_prefix = "glog-0.7.1",
-        urls = ["https://github.com/google/glog/archive/v0.7.1.zip"],
+        url = "https://github.com/google/glog/archive/refs/tags/v0.5.0.tar.gz",
+        sha256 = "eede71f28371bf39aa69b45de23b329d37214016e2055269b3b5e7cfd40b59f5",
+        strip_prefix = "glog-0.5.0",
+    )
+
+    maybe(
+        http_archive,
+        name = "com_google_protobuf",
+        sha256 = "008a11cc56f9b96679b4c285fd05f46d317d685be3ab524b2a310be0fbad987e",
+        strip_prefix = "protobuf-29.3",
+        urls = [
+            "https://github.com/protocolbuffers/protobuf/archive/v29.3.tar.gz",
+        ],
+        repo_mapping = repo_mapping,
     )
 
     # Copied and then modified to use the latest 'commit' and 'shallow_since'
@@ -113,3 +117,12 @@ def repos():
             "Move-Item -Path support/bazel/WORKSPACE.bazel -Destination WORKSPACE.bazel",
         ],
     )
+
+    if external:
+        maybe(
+            git_repository,
+            name = "com_github_3rdparty_stout",
+            commit = "67e6b9b08f340e223b741130815d97cf20296c08",
+            remote = "https://github.com/3rdparty/stout",
+            shallow_since = "1637367065 -0800",
+        )
diff --git a/include/stout/flags/flags.h b/include/stout/flags/flags.h
index 565453d..6ebab99 100644
--- a/include/stout/flags/flags.h
+++ b/include/stout/flags/flags.h
@@ -218,7 +218,7 @@ class ParserBuilder {
         std::move(help),
         [f = std::forward<F>(f)](google::protobuf::Message& message) {
           return f(
-              *google::protobuf::DynamicCastMessage<Flags>(&message));
+              *google::protobuf::DynamicCastToGenerated<Flags>(&message));
         });
 
     return *this;
@@ -291,7 +291,7 @@ class ParserBuilder {
               google::protobuf::Message& message) {
             return f(
                 value,
-                *google::protobuf::DynamicCastMessage<T>(&message));
+                *google::protobuf::DynamicCastToGenerated<T>(&message));
           };
       return true;
     } else {