diff --git a/saw-remote-api/python/CHANGELOG.md b/saw-remote-api/python/CHANGELOG.md
index d5fc1317e..e4b5a9797 100644
--- a/saw-remote-api/python/CHANGELOG.md
+++ b/saw-remote-api/python/CHANGELOG.md
@@ -1,5 +1,10 @@
 # Revision history for saw-client
 
+## 1.2.1 -- 2024-09-18
+
+* Require building with `argo-client-0.0.13` or later. `argo-client-0.0.13` uses
+  blocking IO, which should reduce CPU load when receiving replies.
+
 ## 1.2.0 -- 2024-08-30
 
 * Add `str_slice()` and `str_slice_range()` functions for constructing MIR `str`
diff --git a/saw-remote-api/python/poetry.lock b/saw-remote-api/python/poetry.lock
index 99c19c0a1..0d9f292c1 100644
--- a/saw-remote-api/python/poetry.lock
+++ b/saw-remote-api/python/poetry.lock
@@ -1,14 +1,14 @@
-# This file is automatically @generated by Poetry 1.8.2 and should not be changed by hand.
+# This file is automatically @generated by Poetry 1.8.3 and should not be changed by hand.
 
 [[package]]
 name = "argo-client"
-version = "0.0.12"
+version = "0.0.13"
 description = "A JSON RPC client library."
 optional = false
 python-versions = "<4,>=3.8.0"
 files = [
-    {file = "argo_client-0.0.12-py3-none-any.whl", hash = "sha256:6986b79f03d6592cdcc87cb228a0829cedf12852134c3af9083a322fa28bdc4a"},
-    {file = "argo_client-0.0.12.tar.gz", hash = "sha256:97f5b2db3caa4598c5cdcb1e9c80b5d330bdc5ecae08e36198e4dab217af4b97"},
+    {file = "argo_client-0.0.13-py3-none-any.whl", hash = "sha256:dd7fdab6b0aecc04c10cfb0ce2989289ebd8f9ae03d9bded16fb6ff8d5c400cb"},
+    {file = "argo_client-0.0.13.tar.gz", hash = "sha256:2cbacdfaa801a89889536145ea46c63d42fa34ae0354bb4f05c39f46074939b4"},
 ]
 
 [package.dependencies]
@@ -189,17 +189,17 @@ files = [
 
 [[package]]
 name = "cryptol"
-version = "3.2.0"
+version = "3.2.1"
 description = "Cryptol client for the Cryptol RPC server"
 optional = false
 python-versions = "<4,>=3.8.0"
 files = [
-    {file = "cryptol-3.2.0-py3-none-any.whl", hash = "sha256:4753bbf22aeef13af09dfb1342613ccf3a573f0355775d25e16fe51d2039c860"},
-    {file = "cryptol-3.2.0.tar.gz", hash = "sha256:8a18a118b97f0cb35d4509b5a060ff76b300380e6c1e76acf6e72600769de9a7"},
+    {file = "cryptol-3.2.1-py3-none-any.whl", hash = "sha256:1d4126727b8c4963317dc534516ef75db4255847679559cf58ed2ce3b202ebb1"},
+    {file = "cryptol-3.2.1.tar.gz", hash = "sha256:94cb3d249f1ae8485966a54fd9cc2e360f5eb7f59cbb02488a7199ef8c4777ef"},
 ]
 
 [package.dependencies]
-argo-client = "0.0.12"
+argo-client = ">=0.0.13"
 BitVector = ">=3.4.9,<4.0.0"
 requests = ">=2.31.0"
 types-requests = ">=2.31.0"
@@ -407,4 +407,4 @@ zstd = ["zstandard (>=0.18.0)"]
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.8"
-content-hash = "8179d8458cdeb24f26e9d8c46e5e9d7adad2935b1299658e79a0c83e7fb97f45"
+content-hash = "71a23001abb21fc1bf9d541cbe4508cf1ed836b241f2bd02ad1e77a505cfc763"
diff --git a/saw-remote-api/python/pyproject.toml b/saw-remote-api/python/pyproject.toml
index 79fdd856d..816be227f 100644
--- a/saw-remote-api/python/pyproject.toml
+++ b/saw-remote-api/python/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "saw-client"
-version = "1.2.0.99"
+version = "1.2.1.99"
 readme = "README.md"
 description = "SAW client for the SAW RPC server"
 authors = ["Galois, Inc. <saw@galois.com>"]
@@ -14,8 +14,8 @@ include = [
 python = "^3.8"
 requests = "^2.25.1"
 BitVector = "^3.4.9"
-cryptol = "3.2.0" # { path = "../../deps/cryptol/cryptol-remote-api/python/", develop = true }
-argo-client = "0.0.12"
+cryptol = "3.2.1" # { path = "../../deps/cryptol/cryptol-remote-api/python/", develop = true }
+argo-client = ">=0.0.13"
 lmdb = "^1.4.1"
 cbor2 = "^5.4.6"
 python-dateutil = "^2.8.2"