diff --git a/Cargo.lock b/Cargo.lock
index 7fd3f75eb..7b03ac3e1 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2052,9 +2052,9 @@ dependencies = [
 
 [[package]]
 name = "aws-smithy-runtime-api"
-version = "1.16.2"
+version = "1.18.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "6d881a7b7ad179fd6611680c9de89f716fb00ab40299a9a7b8c6913e8f7511a8"
+checksum = "9bb0deb40a69de59f7809251cfe1ab16de135f42c49d222d1202b4d0ce19720f"
 dependencies = [
  "aws-smithy-async",
  "aws-smithy-runtime-api-macros",
@@ -2092,9 +2092,9 @@ dependencies = [
 
 [[package]]
 name = "aws-smithy-types"
-version = "1.6.4"
+version = "1.8.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0b791f3ac597193fe1d08b82366986eb1f5bc31f2ac6c194c0855276116c76cd"
+checksum = "69bb407740a197147da48238ecc94498493c9e85445732360cec180296ca45f1"
 dependencies = [
  "base64-simd",
  "bytes",
@@ -6471,7 +6471,7 @@ dependencies = [
  "quinn-udp",
  "rustc-hash",
  "rustls 0.23.45",
- "socket2 0.6.5",
+ "socket2 0.5.10",
  "thiserror 2.0.21",
  "tokio",
  "tracing",
@@ -6510,7 +6510,7 @@ dependencies = [
  "cfg_aliases",
  "libc",
  "once_cell",
- "socket2 0.6.5",
+ "socket2 0.5.10",
  "tracing",
  "windows-sys 0.61.2",
 ]
diff --git a/Cargo.toml b/Cargo.toml
index 43c054742..e9f6e43b4 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -20,7 +20,7 @@ aws-config = { version = "1.8.18", features = ["behavior-version-latest"] }
 aws-sdk-bedrockruntime = "1.133.0"
 # Capped below 1.5.0: it makes DeferredSignerSender::send generic, which breaks
 # type inference in aws-runtime 1.7.4 (latest). Lift once aws-runtime ships a fix.
-aws-smithy-types = ">=1.4.9, <1.7.0"
+aws-smithy-types = ">=1.4.9, <1.9.0"
 aws-smithy-runtime-api = "1.14.0"
 aws-credential-types = "1.3.0"
 aws-sigv4 = "1.5.1"