diff --git a/temporalio/Cargo.lock b/temporalio/Cargo.lock
index 014fc0bd..a6f180ec 100644
--- a/temporalio/Cargo.lock
+++ b/temporalio/Cargo.lock
@@ -3387,7 +3387,11 @@ dependencies = [
  "anyhow",
  "assert_matches",
  "async-trait",
+ "bytes",
  "futures-util",
+ "http-body-util",
+ "hyper",
+ "hyper-util",
  "parking_lot",
  "prost",
  "rand 0.9.2",
diff --git a/temporalio/ext/sdk-core b/temporalio/ext/sdk-core
index 871b320c..eb74c70c 160000
--- a/temporalio/ext/sdk-core
+++ b/temporalio/ext/sdk-core
@@ -1 +1 @@
-Subproject commit 871b320c8f51d52cb69fcc31f9c4dcd47b9f3961
+Subproject commit eb74c70c2f4b6d3f56f364b06d6bbc09d01be809
diff --git a/temporalio/lib/temporalio/client/connection.rb b/temporalio/lib/temporalio/client/connection.rb
index 192a7008..2199e52e 100644
--- a/temporalio/lib/temporalio/client/connection.rb
+++ b/temporalio/lib/temporalio/client/connection.rb
@@ -124,7 +124,8 @@ def initialize(interval: 30.0, timeout: 15.0)
       # Options for HTTP CONNECT proxy for client connections.
       #
       # @!attribute target_host
-      #   @return [String] Target host:port for the HTTP CONNECT proxy.
+      #   @return [String] Target for the HTTP CONNECT proxy. Use host:port for TCP, or unix:/path/to/unix.sock for Unix
+      #     socket (meaning it'll start with "unix:/").
       # @!attribute basic_auth_user
       #   @return [String, nil] User for HTTP basic auth for the proxy, must be combined with {basic_auth_pass}.
       # @!attribute basic_auth_pass