diff --git a/cryptol-remote-api/python/CHANGELOG.md b/cryptol-remote-api/python/CHANGELOG.md
index 9891041a9..75383a288 100644
--- a/cryptol-remote-api/python/CHANGELOG.md
+++ b/cryptol-remote-api/python/CHANGELOG.md
@@ -3,6 +3,7 @@
 ## 2.12.4 -- YYYY-MM-DD
 
 * NEW CHANGELOG ENTRIES SINCE 2.12.2 GO HERE
+* fix: add `typing-extensions` as an explicit dependency for the client.
 
 ## 2.12.2 -- 2021-12-21
 
diff --git a/cryptol-remote-api/python/poetry.lock b/cryptol-remote-api/python/poetry.lock
index 18ea3eb71..a5142b64b 100644
--- a/cryptol-remote-api/python/poetry.lock
+++ b/cryptol-remote-api/python/poetry.lock
@@ -97,9 +97,9 @@ python-versions = "*"
 
 [[package]]
 name = "typing-extensions"
-version = "4.0.1"
+version = "4.1.1"
 description = "Backported and Experimental Type Hints for Python 3.6+"
-category = "dev"
+category = "main"
 optional = false
 python-versions = ">=3.6"
 
@@ -119,7 +119,7 @@ socks = ["PySocks (>=1.5.6,!=1.5.7,<2.0)"]
 [metadata]
 lock-version = "1.1"
 python-versions = ">=3.7.0,<4"
-content-hash = "bee495c33e4a9b337c16d6039644b59138929406641542ed7c8f434e38625811"
+content-hash = "0c1d6c0a579dc7d153132608a30c0a60397bb2a29fa360810071ca7ea0250c7a"
 
 [metadata.files]
 argo-client = [
@@ -206,8 +206,8 @@ typed-ast = [
     {file = "typed_ast-1.4.3.tar.gz", hash = "sha256:fb1bbeac803adea29cedd70781399c99138358c26d05fcbd23c13016b7f5ec65"},
 ]
 typing-extensions = [
-    {file = "typing_extensions-4.0.1-py3-none-any.whl", hash = "sha256:7f001e5ac290a0c0401508864c7ec868be4e701886d5b573a9528ed3973d9d3b"},
-    {file = "typing_extensions-4.0.1.tar.gz", hash = "sha256:4ca091dea149f945ec56afb48dae714f21e8692ef22a395223bcd328961b6a0e"},
+    {file = "typing_extensions-4.1.1-py3-none-any.whl", hash = "sha256:21c85e0fe4b9a155d0799430b0ad741cdce7e359660ccbd8b530613e8df88ce2"},
+    {file = "typing_extensions-4.1.1.tar.gz", hash = "sha256:1a9462dcc3347a79b1f1c0271fbe79e844580bb598bafa1ed208b94da3cdcd42"},
 ]
 urllib3 = [
     {file = "urllib3-1.26.7-py2.py3-none-any.whl", hash = "sha256:c4fdf4019605b6e5423637e01bc9fe4daef873709a7973e195ceba0a62bbc844"},
diff --git a/cryptol-remote-api/python/pyproject.toml b/cryptol-remote-api/python/pyproject.toml
index 3bb931075..976c4f547 100644
--- a/cryptol-remote-api/python/pyproject.toml
+++ b/cryptol-remote-api/python/pyproject.toml
@@ -17,6 +17,7 @@ python = ">=3.7.0,<4"
 requests = "^2.25.1"
 BitVector = "^3.4.9"
 argo-client = "0.0.10"
+typing-extensions = "^4.1.1"
 
 [tool.poetry.dev-dependencies]
 mypy = "^0.812"