diff --git a/pyproject.toml b/pyproject.toml
index 044dee55..2cb10723 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -10,7 +10,12 @@ readme = "README.md"
 license = { file = "LICENSE" }
 authors = [{ name = "Replicate, Inc." }]
 requires-python = ">=3.8"
-dependencies = ["packaging", "pydantic>1", "httpx>=0.21.0,<1"]
+dependencies = [
+    "httpx>=0.21.0,<1",
+    "packaging",
+    "pydantic>1",
+    "typing_extensions>=4.5.0",
+]
 optional-dependencies = { dev = [
     "mypy",
     "pylint",
diff --git a/requirements-dev.txt b/requirements-dev.txt
index 0759b688..e8be578f 100644
--- a/requirements-dev.txt
+++ b/requirements-dev.txt
@@ -82,6 +82,7 @@ typing-extensions==4.7.1
     #   mypy
     #   pydantic
     #   pydantic-core
+    #   replicate (pyproject.toml)
 vcrpy==5.1.0
     # via pytest-recording
 wrapt==1.15.0
diff --git a/requirements.txt b/requirements.txt
index 6fac3e28..21ec722f 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -37,3 +37,4 @@ typing-extensions==4.7.1
     # via
     #   pydantic
     #   pydantic-core
+    #   replicate (pyproject.toml)