diff --git a/poetry.lock b/poetry.lock
index 23e3e02..d98177a 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -895,20 +895,6 @@ ssh = ["bcrypt (>=3.1.5)"]
 test = ["certifi", "pretend", "pytest (>=6.2.0)", "pytest-benchmark", "pytest-cov", "pytest-xdist"]
 test-randomorder = ["pytest-randomly"]
 
-[[package]]
-name = "deprecation"
-version = "2.1.0"
-description = "A library to handle automated deprecations"
-optional = false
-python-versions = "*"
-files = [
-    {file = "deprecation-2.1.0-py2.py3-none-any.whl", hash = "sha256:a10811591210e1fb0e768a8c25517cabeabcba6f0bf96564f8ff45189f90b14a"},
-    {file = "deprecation-2.1.0.tar.gz", hash = "sha256:72b3bde64e5d778694b0cf68178aed03d15e15477116add3fb773e581f9518ff"},
-]
-
-[package.dependencies]
-packaging = "*"
-
 [[package]]
 name = "dill"
 version = "0.3.8"
@@ -2125,36 +2111,46 @@ pbr = ">=2.0.0,<2.1.0 || >2.1.0"
 
 [[package]]
 name = "testcontainers"
-version = "3.7.1"
-description = "Library provides lightweight, throwaway instances of common databases, Selenium web browsers, or anything else that can run in a Docker container"
+version = "4.3.3"
+description = "Python library for throwaway instances of anything that can run in a Docker container"
 optional = false
-python-versions = ">=3.7"
+python-versions = "<4.0,>=3.9"
 files = [
-    {file = "testcontainers-3.7.1-py2.py3-none-any.whl", hash = "sha256:7f48cef4bf0ccd78f1a4534d4b701a003a3bace851f24eae58a32f9e3f0aeba0"},
+    {file = "testcontainers-4.3.3-py3-none-any.whl", hash = "sha256:e9309c53529e842485e4b326a754bb87b0ddaa78da6422275b52796c0cb7eb8b"},
+    {file = "testcontainers-4.3.3.tar.gz", hash = "sha256:48d5cc314be39ad8e678057347c49aef5f2786227470a2fcf43584fc79a8e4a0"},
 ]
 
 [package.dependencies]
-deprecation = "*"
-docker = ">=4.0.0"
+docker = "*"
+typing-extensions = "*"
+urllib3 = "*"
 wrapt = "*"
 
 [package.extras]
-arangodb = ["python-arango"]
-azurite = ["azure-storage-blob"]
+arangodb = ["python-arango (>=7.8,<8.0)"]
+azurite = ["azure-storage-blob (>=12.19,<13.0)"]
+chroma = ["chromadb-client"]
 clickhouse = ["clickhouse-driver"]
-docker-compose = ["docker-compose"]
-google-cloud-pubsub = ["google-cloud-pubsub (<2)"]
-kafka = ["kafka-python"]
+google = ["google-cloud-datastore (>=2)", "google-cloud-pubsub (>=2)"]
+influxdb = ["influxdb", "influxdb-client"]
+k3s = ["kubernetes", "pyyaml"]
 keycloak = ["python-keycloak"]
-mongo = ["pymongo"]
-mssqlserver = ["pymssql"]
-mysql = ["pymysql", "sqlalchemy"]
+localstack = ["boto3"]
+minio = ["minio"]
+mongodb = ["pymongo"]
+mssql = ["pymssql", "sqlalchemy"]
+mysql = ["pymysql[rsa]", "sqlalchemy"]
+nats = ["nats-py"]
 neo4j = ["neo4j"]
-oracle = ["cx-Oracle", "sqlalchemy"]
-postgresql = ["psycopg2-binary", "sqlalchemy"]
+opensearch = ["opensearch-py"]
+oracle = ["oracledb", "sqlalchemy"]
+oracle-free = ["oracledb", "sqlalchemy"]
+qdrant = ["qdrant-client"]
 rabbitmq = ["pika"]
 redis = ["redis"]
+registry = ["bcrypt"]
 selenium = ["selenium"]
+weaviate = ["weaviate-client (>=4.5.4,<5.0.0)"]
 
 [[package]]
 name = "tomli"
@@ -2360,5 +2356,5 @@ sentry = ["sentry-sdk"]
 
 [metadata]
 lock-version = "2.0"
-python-versions = ">=3.9"
-content-hash = "57e838811194bb2259c31cd6a8c906301bce80a8c59da22cd5a8376954eb23f4"
+python-versions = ">=3.9,<4.0"
+content-hash = "29b158bcf81b368aee3def23f3361dee168481be3348362e7189256efbc65d0d"
diff --git a/pyproject.toml b/pyproject.toml
index 57b98bb..2deba84 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -20,7 +20,7 @@ classifiers = [
 earhorn = "earhorn.main:cli"
 
 [tool.poetry.dependencies]
-python = ">=3.9"
+python = ">=3.9,<4.0"
 click = "^8.0.1"
 httpx = "^0.27.0"
 lxml = "^5.0.0"
@@ -48,7 +48,7 @@ pytest = "^8.0.0"
 pytest-cov = "^5.0.0"
 pytest-httpx = "^0.30.0"
 pytest-xdist = "^3.0.0"
-testcontainers = "^3.7.1"
+testcontainers = "^4.0.0"
 types-boto3 = "^1.0.2"
 
 [build-system]