diff --git a/src/fi/alk/harness/call_runner.py b/src/fi/alk/harness/call_runner.py
index 09dd800cc..cba9e2158 100644
--- a/src/fi/alk/harness/call_runner.py
+++ b/src/fi/alk/harness/call_runner.py
@@ -588,7 +588,7 @@ def setting(name: str) -> str:
                 "agent_id": provider_target_id,
                 "api_url": str(
                     simulator_config.get("retell_api_url")
-                    or "https://api.retellai.com/v2/create-web-call"
+                    or "https://api.retellai.com/v3/create-web-call"
                 ),
                 "livekit_url": str(
                     simulator_config.get("retell_livekit_url")
diff --git a/src/fi/simulate/agent/definition.py b/src/fi/simulate/agent/definition.py
index 14d209402..08ae6fd2e 100644
--- a/src/fi/simulate/agent/definition.py
+++ b/src/fi/simulate/agent/definition.py
@@ -235,7 +235,7 @@ class RetellTargetConfig(BaseModel):
     provider: Literal["retell"] = "retell"
     agent_id: str = Field(..., min_length=1)
     api_url: AnyHttpUrl = Field(
-        "https://api.retellai.com/v2/create-web-call",
+        "https://api.retellai.com/v3/create-web-call",
         validate_default=True,
     )
     livekit_url: AnyUrl = Field(
diff --git a/src/fi/simulate/simulation/bridge/retell.py b/src/fi/simulate/simulation/bridge/retell.py
index 174a7f01d..2104e06a3 100644
--- a/src/fi/simulate/simulation/bridge/retell.py
+++ b/src/fi/simulate/simulation/bridge/retell.py
@@ -62,7 +62,7 @@ def from_env(cls) -> "RetellWebCallConnector":
                 agent_id=agent_id,
                 api_url=os.environ.get(
                     "RETELL_API_URL",
-                    "https://api.retellai.com/v2/create-web-call",
+                    "https://api.retellai.com/v3/create-web-call",
                 ),
                 livekit_url=os.environ.get(
                     "RETELL_LIVEKIT_URL",