diff --git a/python/agents/adk-ae-oauth/pyproject.toml b/python/agents/adk-ae-oauth/pyproject.toml
index 5323c0f5e8..6c13379c13 100644
--- a/python/agents/adk-ae-oauth/pyproject.toml
+++ b/python/agents/adk-ae-oauth/pyproject.toml
@@ -18,7 +18,7 @@ requires-python = ">=3.10,<3.14"
 
 [dependency-groups]
 dev = [
-    "pytest>=8.3.4,<9.0.0",
+    "pytest>=8.3.4,<10.0.0",
     "pytest-asyncio>=0.23.8,<1.0.0",
     "nest-asyncio>=1.6.0,<2.0.0",
     "agent-starter-pack>=0.14.1",
diff --git a/python/agents/ai-security-agent/pyproject.toml b/python/agents/ai-security-agent/pyproject.toml
index b5ecd67593..62d274dd69 100644
--- a/python/agents/ai-security-agent/pyproject.toml
+++ b/python/agents/ai-security-agent/pyproject.toml
@@ -10,19 +10,19 @@ readme = "README.md"
 requires-python = ">=3.12"
 
 dependencies = [
-    "google-adk>=1.18.0",
+    "google-adk>=1.31.1",
     "google-genai>=1.9.0",
     "google-cloud-aiplatform>=1.127.0",
-    "python-dotenv>=1.2.1",
+    "python-dotenv>=1.2.2",
     "pyyaml>=6.0.3",
     "tenacity>=9.1.2",
 ]
 
 [dependency-groups]
 dev = [
-    "pytest>=8.3.5",
+    "pytest>=9.0.3",
     "pytest-asyncio>=0.26.0",
-    "google-adk[eval]>=1.0.0",
+    "google-adk[eval]>=1.31.1",
     "ruff>=0.4.6",
     "mypy>=1.18.2",
     "agent-starter-pack>=0.32.0",
diff --git a/python/agents/brand-aligned-presentations/pyproject.toml b/python/agents/brand-aligned-presentations/pyproject.toml
index 90a20ab995..3a9c496c67 100644
--- a/python/agents/brand-aligned-presentations/pyproject.toml
+++ b/python/agents/brand-aligned-presentations/pyproject.toml
@@ -31,10 +31,10 @@ dependencies = [
     "google-cloud-aiplatform[agent-engines]>=1.142.0",
     "google-cloud-modelarmor>=0.4.0",
     "python-pptx==1.0.2",
-    "pillow==11.3.0",
+    "pillow==12.2.0",
     "pydantic>=2.12.0",
     "pydantic-settings==2.13.1",
-    "python-dotenv==1.1.1",
+    "python-dotenv==1.2.2",
     "google-cloud-storage==2.19.0",
     "google-genai>=1.68.0",
     "matplotlib==3.10.6",
diff --git a/python/agents/brand-search-optimization/pyproject.toml b/python/agents/brand-search-optimization/pyproject.toml
index 7fc71ca227..a564b7c877 100644
--- a/python/agents/brand-search-optimization/pyproject.toml
+++ b/python/agents/brand-search-optimization/pyproject.toml
@@ -14,7 +14,7 @@ dependencies = [
     "webdriver-manager>=4.0.2,<5.0.0",
     "google-cloud-bigquery>=3.31.0,<4.0.0",
     "google-cloud-aiplatform[agent-engines]>=1.93.0,<2.0.0",
-    "pillow>=11.1.0,<12.0.0",
+    "pillow>=11.1.0,<13.0.0",
     "google-adk>=1.0.0,<2.0.0",
 ]
 
diff --git a/python/agents/customer-service/pyproject.toml b/python/agents/customer-service/pyproject.toml
index 04e5c1c06a..2fc4339c0b 100644
--- a/python/agents/customer-service/pyproject.toml
+++ b/python/agents/customer-service/pyproject.toml
@@ -11,7 +11,7 @@ requires-python = ">=3.10,<3.13"
 
 dependencies = [
     "google-cloud-aiplatform[adk,agent_engine]>=1.93.0",
-    "google-adk>=1.0.0",
+    "google-adk>=1.31.1",
     "pydantic-settings>=2.8.1",
     "tabulate>=0.9.0",
     "cloudpickle>=3.1.1",
@@ -20,7 +20,7 @@ dependencies = [
 
 [dependency-groups]
 dev = [
-    "pytest>=8.3.5",
+    "pytest>=9.0.3",
     "pytest-mock>=3.14.0",
     "pytest-cov>=6.0.0",
     "pytest-asyncio>=0.25.3",
diff --git a/python/agents/data-science/pyproject.toml b/python/agents/data-science/pyproject.toml
index 9f95c20b81..e22cbe8925 100644
--- a/python/agents/data-science/pyproject.toml
+++ b/python/agents/data-science/pyproject.toml
@@ -10,8 +10,8 @@ readme = "README.md"
 requires-python = ">=3.12"
 
 dependencies = [
-    "python-dotenv>=1.0.1",
-    "google-adk>=1.14",
+    "python-dotenv>=1.2.2",
+    "google-adk>=1.31.1",
     "immutabledict>=4.2.1",
     "sqlglot>=26.10.1",
     "db-dtypes>=1.4.2",
@@ -31,9 +31,9 @@ dependencies = [
 [dependency-groups]
 dev = [
     "google-cloud-aiplatform[adk,agent-engines,evaluation]>=1.93.0",
-    "pytest>=8.3.5",
+    "pytest>=9.0.3",
     "pytest-asyncio>=0.26.0",
-    "google-adk[eval]>=1.14",
+    "google-adk[eval]>=1.31.1",
     "ruff>=0.4.6",
     "agent-starter-pack>=0.14.1",
 ]
diff --git a/python/agents/genmedia-for-commerce/pyproject.toml b/python/agents/genmedia-for-commerce/pyproject.toml
index 7d1263ee24..50eba6322f 100644
--- a/python/agents/genmedia-for-commerce/pyproject.toml
+++ b/python/agents/genmedia-for-commerce/pyproject.toml
@@ -57,7 +57,7 @@ dependencies = [
 
 [dependency-groups]
 dev = [
-    "pytest>=8.3.4,<9.0.0",
+    "pytest>=8.3.4,<10.0.0",
     "pytest-asyncio>=0.23.8,<1.0.0",
     "pytest-cov>=4.0.0",
     "nest-asyncio>=1.6.0,<2.0.0",
diff --git a/python/agents/hierarchical-workflow-automation/requirements.txt b/python/agents/hierarchical-workflow-automation/requirements.txt
index 67dcd8ff84..94deed61bd 100644
--- a/python/agents/hierarchical-workflow-automation/requirements.txt
+++ b/python/agents/hierarchical-workflow-automation/requirements.txt
@@ -7,7 +7,7 @@ annotated-types==0.7.0
 anyio==4.10.0
 asyncio-mqtt==0.16.2
 attrs==25.3.0
-Authlib==1.6.3
+Authlib==1.6.11
 black==25.1.0
 Bottleneck==1.6.0
 cachetools==5.5.2
@@ -16,14 +16,14 @@ cffi==1.17.1
 charset-normalizer==3.4.3
 click==8.2.1
 cloudpickle==3.0.0
-cryptography==45.0.7
+cryptography==46.0.7
 dataclasses-json==0.6.7
 Deprecated==1.2.18
 docstring_parser==0.17.0
 dotenv==0.9.9
 fastapi==0.116.1
 frozenlist==1.7.0
-google-adk==1.13.0
+google-adk==1.28.1
 google-api-core==2.25.1
 google-api-python-client==2.181.0
 google-auth==2.40.3
@@ -70,7 +70,7 @@ langchain==0.3.27
 langchain-community==0.3.29
 langchain-core==0.3.76
 langchain-google-vertexai==2.1.2
-langchain-text-splitters==0.3.11
+langchain-text-splitters==1.1.2
 langgraph==0.3.34
 langgraph-checkpoint==2.1.1
 langgraph-prebuilt==0.1.8
@@ -115,12 +115,12 @@ pydantic-settings==2.10.1
 pydantic_core==2.33.2
 Pygments==2.19.2
 pyparsing==3.2.3
-pytest==8.4.2
+pytest==9.0.3
 pytest-asyncio==1.1.0
 pytest-mock==3.14.1
 python-dateutil==2.9.0.post0
-python-dotenv==1.1.1
-python-multipart==0.0.20
+python-dotenv==1.2.2
+python-multipart==0.0.26
 PyYAML==6.0.2
 referencing==0.36.2
 requests==2.32.5
diff --git a/python/agents/parallel_task_decomposition_execution/pyproject.toml b/python/agents/parallel_task_decomposition_execution/pyproject.toml
index 5083e4d4c2..58646cc3ce 100644
--- a/python/agents/parallel_task_decomposition_execution/pyproject.toml
+++ b/python/agents/parallel_task_decomposition_execution/pyproject.toml
@@ -10,8 +10,8 @@ readme = "README.md"
 requires-python = ">=3.10"
 
 dependencies = [
-    "google-adk==1.19.0",
-    "python-dotenv==1.2.1",
+    "google-adk==1.28.1",
+    "python-dotenv==1.2.2",
     "google-cloud-aiplatform[adk,agent-engines]==1.128.0",
     "mcp==1.21.2",
 ]
diff --git a/python/agents/parallel_task_decomposition_execution/requirements.txt b/python/agents/parallel_task_decomposition_execution/requirements.txt
index 9a534b0983..af4c82c746 100644
--- a/python/agents/parallel_task_decomposition_execution/requirements.txt
+++ b/python/agents/parallel_task_decomposition_execution/requirements.txt
@@ -1,5 +1,5 @@
-google-adk==1.19.0
-python-dotenv==1.2.1
+google-adk==1.28.1
+python-dotenv==1.2.2
 google-cloud-aiplatform==1.128.0
 google-cloud-aiplatform[adk,agent_engines]
 mcp==1.21.2
diff --git a/python/agents/plumber-data-engineering-assistant/pyproject.toml b/python/agents/plumber-data-engineering-assistant/pyproject.toml
index 583b82582c..b26c567285 100644
--- a/python/agents/plumber-data-engineering-assistant/pyproject.toml
+++ b/python/agents/plumber-data-engineering-assistant/pyproject.toml
@@ -25,14 +25,14 @@ dependencies = [
     "fastapi==0.116.1",
     "uvicorn==0.35.0",
     "GitPython==3.1.45",
-    "google-adk==1.16.0",
+    "google-adk==1.28.1",
     "google-api-python-client==2.177.0",
     "google-cloud-monitoring==2.27.2",
     "google-cloud-dataform==0.7.0",
     "google-cloud-storage==2.19.0",
     "google-generativeai==0.8.5",
-    "Pillow==11.3.0",
-    "python-dotenv==1.1.1",
+    "Pillow==12.2.0",
+    "python-dotenv==1.2.2",
     "requests==2.32.4",
     "apache-beam[gcp]==2.69.0",
 ]
@@ -49,7 +49,7 @@ dev = [
     "plumber[lint]",
     "ipykernel>=6.29.5",
     "ipython>=8.36.0",
-    "pytest>=8.3.5",
+    "pytest>=9.0.3",
     "pytest-cov>=4.0.0",
     "pytest-asyncio>=0.26.0",
     "pre-commit>=4.2.0",
diff --git a/python/agents/policy-as-code/pyproject.toml b/python/agents/policy-as-code/pyproject.toml
index efb965acd5..14e18ce00a 100644
--- a/python/agents/policy-as-code/pyproject.toml
+++ b/python/agents/policy-as-code/pyproject.toml
@@ -8,7 +8,7 @@ license = { text = "Apache-2.0" }
 requires-python = ">=3.11"
 dependencies = [
     "PyYAML==6.0.3",
-    "google-adk[eval]==1.21.0",
+    "google-adk[eval]==1.28.1",
     "google-cloud-storage==2.19.0",
     "vertexai==1.43.0",
     "google-cloud-dataplex==2.14.0",
@@ -19,7 +19,7 @@ dependencies = [
 
 [dependency-groups]
 dev = [
-    "pytest==8.4.2",
+    "pytest==9.0.3",
     "pytest-xdist==3.8.0",
     "pytest-asyncio==1.3.0",
     "python-dotenv>=1.0.0",
diff --git a/python/agents/tau2-benchmark-agent/pyproject.toml b/python/agents/tau2-benchmark-agent/pyproject.toml
index c5f1b9deca..3d8e5d49fa 100644
--- a/python/agents/tau2-benchmark-agent/pyproject.toml
+++ b/python/agents/tau2-benchmark-agent/pyproject.toml
@@ -8,7 +8,7 @@ readme = "README.md"
 requires-python = ">=3.10"
 
 dependencies = [
-    "google-adk==1.19.0",
+    "google-adk==1.28.1",
     "google-genai==1.51.0",
     "loguru==0.7.3",
     "tenacity==9.1.2",