diff --git a/pyproject.toml b/pyproject.toml
index 30c4bb1..1f99fa1 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -58,7 +58,7 @@ test = [
     "a2a-sdk>=0.3.0,<1.0.0",
     "acp-sdk>=1.0.0",
     "openai>=2.0.0",
-    "google-genai>=1.0.0",
+    "google-genai>=2.16.0",
     "agntcy-acp>=1.5.0",
 ]
 postgres = [
diff --git a/requirements.txt b/requirements.txt
index bb44c5c..ddf6d68 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -17,7 +17,7 @@ mcp>=1.27.0,<2.0.0
 a2a-sdk>=0.3.0,<1.0.0   # 0.3.x ships the JSON-RPC pydantic types we target
 acp-sdk>=1.0.0          # ACP models (server class is bypassed; see docs/PROTOCOL_SUPPORT.md)
 openai>=2.0.0           # ChatCompletionMessageToolCall (function-calling format)
-google-genai>=1.0.0     # Gemini FunctionCall / FunctionResponse
+google-genai>=2.16.0     # Gemini FunctionCall / FunctionResponse
 agntcy-acp>=1.5.0       # AGNTCY Agent Connect Protocol (RunCreateStateless, MessageTextBlock)
 
 # Governance plane (runtime): Ed25519 agent identity / signatures + signed audit checkpoints