diff --git a/server.py b/server.py
index 0fd650a..af1d4d7 100644
--- a/server.py
+++ b/server.py
@@ -790,7 +790,7 @@ def _build_agent_card(host: str) -> dict:
             # Ref: docs/extensions/effect-domain-v1.md in protoWorkstacean.
             "extensions": [
                 {
-                    "uri": "https://protolabs.ai/a2a/ext/effect-domain-v1",
+                    "uri": "https://proto-labs.ai/a2a/ext/effect-domain-v1",
                     "params": {
                         "skills": {
                             "bug_triage": {
@@ -817,7 +817,7 @@ def _build_agent_card(host: str) -> dict:
                 # extraction side; a Quinn follow-up will plumb LiteLLM's
                 # response_cost through.
                 {
-                    "uri": "https://protolabs.ai/a2a/ext/cost-v1",
+                    "uri": "https://proto-labs.ai/a2a/ext/cost-v1",
                 },
             ],
         },
diff --git a/tests/test_a2a_integration.py b/tests/test_a2a_integration.py
index 3819e91..7ff5cba 100644
--- a/tests/test_a2a_integration.py
+++ b/tests/test_a2a_integration.py
@@ -55,7 +55,7 @@ def test_agent_card_declares_effect_domain_extension() -> None:
     exts = card["capabilities"].get("extensions", [])
     effect_ext = next(
         (e for e in exts
-         if e.get("uri") == "https://protolabs.ai/a2a/ext/effect-domain-v1"),
+         if e.get("uri") == "https://proto-labs.ai/a2a/ext/effect-domain-v1"),
         None,
     )
     assert effect_ext is not None, (
@@ -88,7 +88,7 @@ def test_agent_card_does_not_over_declare_read_only_effects() -> None:
     exts = card["capabilities"].get("extensions", [])
     effect_ext = next(
         (e for e in exts
-         if e.get("uri") == "https://protolabs.ai/a2a/ext/effect-domain-v1"),
+         if e.get("uri") == "https://proto-labs.ai/a2a/ext/effect-domain-v1"),
         {"params": {"skills": {}}},
     )
     declared = effect_ext["params"]["skills"]
@@ -109,7 +109,7 @@ def test_agent_card_declares_cost_v1_extension() -> None:
     exts = card["capabilities"].get("extensions", [])
     cost_ext = next(
         (e for e in exts
-         if e.get("uri") == "https://protolabs.ai/a2a/ext/cost-v1"),
+         if e.get("uri") == "https://proto-labs.ai/a2a/ext/cost-v1"),
         None,
     )
     assert cost_ext is not None, (