diff --git a/examples/workspace/WORKSPACE b/examples/workspace/WORKSPACE
index 35ff15a..4454d69 100644
--- a/examples/workspace/WORKSPACE
+++ b/examples/workspace/WORKSPACE
@@ -1,3 +1,18 @@
+load("@bazel_tools//tools/build_defs/repo:http.bzl", "http_archive")
+
+http_archive(
+    name = "rules_python",
+    sha256 = "4912ced70dc1a2a8e4b86cec233b192ca053e82bc72d877b98e126156e8f228d",
+    strip_prefix = "rules_python-0.32.2",
+    url = "https://github.com/bazelbuild/rules_python/releases/download/0.32.2/rules_python-0.32.2.tar.gz",
+)
+
+load("@rules_python//python:repositories.bzl", "py_repositories", "python_register_toolchains")
+
+py_repositories()
+
+python_register_toolchains("black_mamba", "3.8")
+
 local_repository(
     name = "rules_ophiuchus",
     path = "../..",
@@ -6,7 +21,7 @@ local_repository(
 load("@rules_ophiuchus//python:poetry_parse.bzl", "poetry_parse")
 load("@rules_ophiuchus//python:repositories.bzl", install_poetry_dependencies = "install_dependencies")
 
-install_poetry_dependencies()
+install_poetry_dependencies("black_mamba", "3.8")
 
 poetry_parse(
     name = "poetry",
diff --git a/python/poetry_deps.bzl b/python/poetry_deps.bzl
index c731491..d7b86cd 100644
--- a/python/poetry_deps.bzl
+++ b/python/poetry_deps.bzl
@@ -61,6 +61,7 @@ def _package_impl(ctx):
     install_inputs = poetry_deps_info.files
 
     # Declare package output directory
+    print("python_version", python_version)
     output = ctx.actions.declare_directory("{}/{}/{}".format(python_version, runtime_tag, ctx.label.name))
 
     # Collect installation tool arguments
diff --git a/python/private/poetry_deps.bzl b/python/private/poetry_deps.bzl
index f05d934..ea0fdeb 100644
--- a/python/private/poetry_deps.bzl
+++ b/python/private/poetry_deps.bzl
@@ -30,7 +30,9 @@ def _collect_version(parts):
     return ".".join(version)
 
 def _get_python_version(interpreter):
-    parts = interpreter.split("_")
+    print(interpreter)
+    parts = interpreter.replace(".", "_").split("_")
+    print(parts)
     for index in range(len(parts)):
         if parts[index].endswith("python3"):
             return "3." + _collect_version(parts[index + 1:])
diff --git a/python/private/poetry_parse.bzl b/python/private/poetry_parse.bzl
index 1a4286f..7187681 100644
--- a/python/private/poetry_parse.bzl
+++ b/python/private/poetry_parse.bzl
@@ -1,3 +1,5 @@
+#load("@rules_python//:")
+
 def dfs_cycles(graph):
     # Detect pip dependency cycles u->...->v...->w->v and remove edges w->v
     # Graph DFS with path tracking
@@ -175,12 +177,12 @@ print(json.dumps(json.dumps(dict(
     return "{}"
 
 def _poetry_parse_impl(rctx):
-    print(rctx.attr._python_host)
     interpter = rctx.path(rctx.attr._python_host)
-    command = "import tomllib; print('{0}', 1); print(tomllib.load(open('{0}', 'rb')))".format(rctx.path(rctx.attr.lock))
-    print(command)
-    exec_result = rctx.execute([interpter, "-c", command], quiet = False)
-    print(exec_result)
+    print("!!!", interpter)
+    # command = "import tomllib; print('{0}', 1); print(tomllib.load(open('{0}', 'rb')))".format(rctx.path(rctx.attr.lock))
+    # print(command)
+    # exec_result = rctx.execute([interpter, "-c", command], quiet = False)
+    # print(exec_result)
 
     header = "# Autogenerated file _poetry_parse_impl at rules_ophiuchus/python/private/poetry_parse.bzl:175"
     rules_repository = str(rctx.path(rctx.attr._self)).split("/")[-4]
@@ -207,7 +209,7 @@ poetry_parse = repository_rule(
         ),
         "_python_host": attr.label(
             allow_single_file = True,
-            default = "@python_3_12_host//:bin/python3",
+            default = "@python_xxx_host//:bin/python3",
         ),
         "_self": attr.label(
             allow_single_file = True,
diff --git a/python/repositories.bzl b/python/repositories.bzl
index 06d6444..e080561 100644
--- a/python/repositories.bzl
+++ b/python/repositories.bzl
@@ -16,6 +16,7 @@ _INTERNAL_DEPS = [
 def _poetry_deps_repo_impl(ctx):
     poetry_version = "1.8.3"
 
+    # TODO: switch to
     # Intentionally use a host default interpreter as the repository only used in host tooling targets
     # This may lead to inconsistency if the repository will be used with a different toolchain
     python = ctx.which("python.exe" if "win" in ctx.os.name else "python3")
@@ -55,7 +56,7 @@ poetry_deps_repo = repository_rule(
     },
 )
 
-def install_dependencies(auth_patterns = {}, netrc = ""):
+def install_dependencies(toolchain_prefix, python_version, auth_patterns = {}, netrc = ""):
     prefix = "rules_ophiuchus_"
 
     for (name, url, sha256, patches) in _INTERNAL_DEPS: