diff --git a/.github/workflows/pr.yml b/.github/workflows/pr.yml
index 4801366..5b7df00 100644
--- a/.github/workflows/pr.yml
+++ b/.github/workflows/pr.yml
@@ -13,5 +13,5 @@ jobs:
     uses: epam/ai-dial-ci/.github/workflows/python_package_pr.yml@2.3.1
     secrets: inherit
     with:
-      python-version: 3.8
-      code-checks-python-versions: '["3.8", "3.9", "3.10", "3.11", "3.12"]'
+      python-version: 3.9
+      code-checks-python-versions: '["3.9", "3.10", "3.11", "3.12"]'
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 9730082..b80e08e 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -13,5 +13,5 @@ jobs:
     uses: epam/ai-dial-ci/.github/workflows/python_package_release.yml@2.3.1
     secrets: inherit
     with:
-      python-version: 3.8
-      code-checks-python-versions: '["3.8", "3.9", "3.10", "3.11", "3.12"]'
+      python-version: 3.9
+      code-checks-python-versions: '["3.9", "3.10", "3.11", "3.12"]'
diff --git a/noxfile.py b/noxfile.py
index acaeb73..7bcd0f3 100644
--- a/noxfile.py
+++ b/noxfile.py
@@ -53,7 +53,7 @@ def format(session: nox.Session):
     format_with_args(session, SRC)
 
 
-@nox.session(python=["3.8", "3.9", "3.10", "3.11", "3.12"])
+@nox.session(python=["3.9", "3.10", "3.11", "3.12"])
 @nox.parametrize("pydantic", ["1.10.17", "2.8.2"])
 @nox.parametrize("httpx", ["0.25.0", "0.27.0"])
 @nox.parametrize("openai", ["1.1.0", "1.51.0"])
diff --git a/poetry.lock b/poetry.lock
index 96e9982..97946aa 100644
--- a/poetry.lock
+++ b/poetry.lock
@@ -22,9 +22,6 @@ files = [
     {file = "annotated_types-0.7.0.tar.gz", hash = "sha256:aff07c09a53a08bc8cfccb9c85b05f1aa9a2a6f23728d790723543408344ce89"},
 ]
 
-[package.dependencies]
-typing-extensions = {version = ">=4.0.0", markers = "python_version < \"3.9\""}
-
 [[package]]
 name = "anyio"
 version = "4.4.0"
@@ -951,5 +948,5 @@ test = ["covdefaults (>=2.3)", "coverage (>=7.2.7)", "coverage-enable-subprocess
 
 [metadata]
 lock-version = "2.0"
-python-versions = ">=3.8.1,<4.0"
-content-hash = "879999e1de3da9332111f3cba2d0e0b721b69d0b3de85b4c1bf5e9ba13527f72"
+python-versions = ">=3.9,<4.0"
+content-hash = "643da6d9d34da90ce9587e4c27c975926e49ad58c404fcd6a7c69f99631f6354"
diff --git a/pyproject.toml b/pyproject.toml
index 0a9eb20..f1f5feb 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -11,11 +11,12 @@ repository = "https://github.com/epam/ai-dial-client-python"
 packages = [{ include = "aidial_client" }]
 
 [tool.poetry.dependencies]
+python = ">=3.9,<4.0"
 openai = ">=1.1.0,<2.0.0"
-python = ">=3.8.1,<4.0"
 httpx = ">=0.25.0,<1.0"
 pydantic = ">=1.10,<3"
 aiofiles = ">=0.5.0"
+
 [tool.setuptools]
 packages = ["aidial_client"]