diff --git a/src/google/adk/agents/base_agent.py b/src/google/adk/agents/base_agent.py
index ac54bb68..dec85690 100644
--- a/src/google/adk/agents/base_agent.py
+++ b/src/google/adk/agents/base_agent.py
@@ -115,12 +115,6 @@ class BaseAgent(BaseModel):
   Agent name cannot be "user", since it's reserved for end-user's input.
   """
 
-  version: str = ''
-  """The agent's version.
-
-  Version of the agent being invoked. Used to identify the Agent involved in telemetry.
-  """
-
   description: str = ''
   """Description about the agent's capability.
 
@@ -686,7 +680,6 @@ class BaseAgent(BaseModel):
 
     kwargs: Dict[str, Any] = {
         'name': config.name,
-        'version': config.version,
         'description': config.description,
     }
     if config.sub_agents:
diff --git a/src/google/adk/agents/base_agent_config.py b/src/google/adk/agents/base_agent_config.py
index 9dca68c5..3859cb35 100644
--- a/src/google/adk/agents/base_agent_config.py
+++ b/src/google/adk/agents/base_agent_config.py
@@ -55,10 +55,6 @@ class BaseAgentConfig(BaseModel):
 
   name: str = Field(description='Required. The name of the agent.')
 
-  version: str = Field(
-      default='', description='Optional. The version of the agent.'
-  )
-
   description: str = Field(
       default='', description='Optional. The description of the agent.'
   )
diff --git a/src/google/adk/telemetry/tracing.py b/src/google/adk/telemetry/tracing.py
index 8b777ea8..707bc313 100644
--- a/src/google/adk/telemetry/tracing.py
+++ b/src/google/adk/telemetry/tracing.py
@@ -82,8 +82,6 @@ OTEL_INSTRUMENTATION_GENAI_CAPTURE_MESSAGE_CONTENT = (
 
 USER_CONTENT_ELIDED = '<elided>'
 
-GEN_AI_AGENT_VERSION = 'gen_ai.agent.version'
-
 # Needed to avoid circular imports
 if TYPE_CHECKING:
   from ..agents.base_agent import BaseAgent
@@ -157,7 +155,6 @@ def trace_agent_invocation(
   span.set_attribute(GEN_AI_AGENT_DESCRIPTION, agent.description)
 
   span.set_attribute(GEN_AI_AGENT_NAME, agent.name)
-  span.set_attribute(GEN_AI_AGENT_VERSION, agent.version)
   span.set_attribute(GEN_AI_CONVERSATION_ID, ctx.session.id)
 
 
@@ -458,7 +455,6 @@ def use_generate_content_span(
       USER_ID: invocation_context.session.user_id,
       'gcp.vertex.agent.event_id': model_response_event.id,
       'gcp.vertex.agent.invocation_id': invocation_context.invocation_id,
-      GEN_AI_AGENT_VERSION: invocation_context.agent.version,
   }
   if (
       _is_gemini_agent(invocation_context.agent)
@@ -493,7 +489,6 @@ async def use_inference_span(
       USER_ID: invocation_context.session.user_id,
       'gcp.vertex.agent.event_id': model_response_event.id,
       'gcp.vertex.agent.invocation_id': invocation_context.invocation_id,
-      GEN_AI_AGENT_VERSION: invocation_context.agent.version,
   }
   if (
       _is_gemini_agent(invocation_context.agent)
diff --git a/tests/unittests/telemetry/test_spans.py b/tests/unittests/telemetry/test_spans.py
index 81897ba3..3c061e42 100644
--- a/tests/unittests/telemetry/test_spans.py
+++ b/tests/unittests/telemetry/test_spans.py
@@ -24,7 +24,6 @@ from google.adk.models.llm_request import LlmRequest
 from google.adk.models.llm_response import LlmResponse
 from google.adk.sessions.in_memory_session_service import InMemorySessionService
 from google.adk.telemetry.tracing import ADK_CAPTURE_MESSAGE_CONTENT_IN_SPANS
-from google.adk.telemetry.tracing import GEN_AI_AGENT_VERSION
 from google.adk.telemetry.tracing import trace_agent_invocation
 from google.adk.telemetry.tracing import trace_call_llm
 from google.adk.telemetry.tracing import trace_inference_result
@@ -120,33 +119,6 @@ async def test_trace_agent_invocation(mock_span_fixture):
       mock.call('gen_ai.operation.name', 'invoke_agent'),
       mock.call('gen_ai.agent.description', agent.description),
       mock.call('gen_ai.agent.name', agent.name),
-      mock.call(GEN_AI_AGENT_VERSION, ''),
-      mock.call(
-          'gen_ai.conversation.id',
-          invocation_context.session.id,
-      ),
-  ]
-  mock_span_fixture.set_attribute.assert_has_calls(
-      expected_calls, any_order=True
-  )
-  assert mock_span_fixture.set_attribute.call_count == len(expected_calls)
-
-
-@pytest.mark.asyncio
-async def test_trace_agent_invocation_with_version(mock_span_fixture):
-  """Test trace_agent_invocation sets span attributes correctly when version is provided."""
-  agent = LlmAgent(name='test_llm_agent', model='gemini-pro')
-  agent.description = 'Test agent description'
-  agent.version = '1.0.0'
-  invocation_context = await _create_invocation_context(agent)
-
-  trace_agent_invocation(mock_span_fixture, agent, invocation_context)
-
-  expected_calls = [
-      mock.call('gen_ai.operation.name', 'invoke_agent'),
-      mock.call('gen_ai.agent.description', agent.description),
-      mock.call('gen_ai.agent.name', agent.name),
-      mock.call(GEN_AI_AGENT_VERSION, agent.version),
       mock.call(
           'gen_ai.conversation.id',
           invocation_context.session.id,
@@ -795,7 +767,6 @@ async def test_generate_content_span(
 
   mock_span.set_attributes.assert_called_once_with({
       GEN_AI_AGENT_NAME: invocation_context.agent.name,
-      GEN_AI_AGENT_VERSION: '',
       GEN_AI_CONVERSATION_ID: invocation_context.session.id,
       USER_ID: invocation_context.session.user_id,
       'gcp.vertex.agent.event_id': 'event-123',
@@ -1116,7 +1087,6 @@ async def test_generate_content_span_with_experimental_semconv(
 
   mock_span.set_attributes.assert_called_once_with({
       GEN_AI_AGENT_NAME: invocation_context.agent.name,
-      GEN_AI_AGENT_VERSION: '',
       GEN_AI_CONVERSATION_ID: invocation_context.session.id,
       USER_ID: invocation_context.session.user_id,
       'gcp.vertex.agent.event_id': 'event-123',