diff --git a/noextras/pyproject.toml b/noextras/pyproject.toml
index 21249fa..93b3346 100644
--- a/noextras/pyproject.toml
+++ b/noextras/pyproject.toml
@@ -4,9 +4,11 @@ version = "0.1.0"
 dependencies = [
   "connect-python",
   "connect-python-example",
-  "pytest==8.4.2",
-  "pytest-asyncio==1.2.0",
-  "pytest-cov==7.0.0",
+
+  # Versions locked in constraint-dependencies
+  "pytest",
+  "pytest-asyncio",
+  "pytest-cov",
 ]
 
 [tool.ruff]
diff --git a/pyproject.toml b/pyproject.toml
index 98146df..ded6a5b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -50,9 +50,6 @@ dev = [
     "mkdocs-material==9.6.20",
     "mkdocstrings[python]==0.30.1",
     "pyright[nodejs]==1.1.405",
-    "pytest==8.4.2",
-    "pytest-asyncio==1.2.0",
-    "pytest-cov==7.0.0",
     "pytest-timeout==2.4.0",
     "pyvoy==0.1.2; sys_platform != 'win32'",
     "ruff~=0.13.2",
@@ -61,6 +58,11 @@ dev = [
     "Twisted[tls,http2]==25.5.0",
     "typing_extensions==4.15.0",
     "zstandard==0.25.0",
+
+    # Versions locked in constraint-dependencies
+    "pytest",
+    "pytest-asyncio",
+    "pytest-cov",
 ]
 
 [build-system]
@@ -69,6 +71,11 @@ build-backend = "uv_build"
 
 [tool.uv]
 resolution = "lowest-direct"
+constraint-dependencies = [
+    "pytest==8.4.2",
+    "pytest-asyncio==1.2.0",
+    "pytest-cov==7.0.0",
+]
 
 [tool.uv.build-backend]
 module-name = "connectrpc"
diff --git a/uv.lock b/uv.lock
index cecc316..22d1863 100644
--- a/uv.lock
+++ b/uv.lock
@@ -15,6 +15,11 @@ members = [
     "connect-python-example",
     "connect-python-noextras",
 ]
+constraints = [
+    { name = "pytest", specifier = "==8.4.2" },
+    { name = "pytest-asyncio", specifier = "==1.2.0" },
+    { name = "pytest-cov", specifier = "==7.0.0" },
+]
 
 [[package]]
 name = "annotated-types"
@@ -495,9 +500,9 @@ dev = [
     { name = "mkdocs-material", specifier = "==9.6.20" },
     { name = "mkdocstrings", extras = ["python"], specifier = "==0.30.1" },
     { name = "pyright", extras = ["nodejs"], specifier = "==1.1.405" },
-    { name = "pytest", specifier = "==8.4.2" },
-    { name = "pytest-asyncio", specifier = "==1.2.0" },
-    { name = "pytest-cov", specifier = "==7.0.0" },
+    { name = "pytest" },
+    { name = "pytest-asyncio" },
+    { name = "pytest-cov" },
     { name = "pytest-timeout", specifier = "==2.4.0" },
     { name = "pyvoy", marker = "sys_platform != 'win32'", specifier = "==0.1.2" },
     { name = "ruff", specifier = "~=0.13.2" },
@@ -542,9 +547,9 @@ dependencies = [
 requires-dist = [
     { name = "connect-python", editable = "." },
     { name = "connect-python-example", editable = "example" },
-    { name = "pytest", specifier = "==8.4.2" },
-    { name = "pytest-asyncio", specifier = "==1.2.0" },
-    { name = "pytest-cov", specifier = "==7.0.0" },
+    { name = "pytest" },
+    { name = "pytest-asyncio" },
+    { name = "pytest-cov" },
 ]
 
 [[package]]