diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 3c9100d..10f593c 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -16,7 +16,7 @@ jobs:
 
     strategy:
       matrix:
-        python-version: ["3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
 
     steps:
       - uses: actions/checkout@v4
@@ -55,7 +55,7 @@ jobs:
 
     strategy:
       matrix:
-        python-version: ["3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
 
     steps:
       - uses: actions/checkout@v4
diff --git a/README.md b/README.md
index 2a712f6..8b2bd5e 100644
--- a/README.md
+++ b/README.md
@@ -18,7 +18,7 @@ This is a synchronous implementation which blocks the caller's thread when readi
 
 ## Supported Python versions
 
-This version of the package is compatible with Python 3.8 and higher.
+This version of the package is compatible with Python 3.9 and higher.
 
 ## Contributing
 
diff --git a/pyproject.toml b/pyproject.toml
index 7e33f45..47fa564 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -13,11 +13,11 @@ classifiers = [
     "License :: OSI Approved :: Apache Software License",
     "Operating System :: OS Independent",
     "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",
     "Programming Language :: Python :: 3.11",
     "Programming Language :: Python :: 3.12",
+    "Programming Language :: Python :: 3.13",
     "Topic :: Software Development",
     "Topic :: Software Development :: Libraries",
 ]
@@ -27,7 +27,7 @@ exclude = [
 ]
 
 [tool.poetry.dependencies]
-python = ">=3.8"
+python = ">=3.9"
 urllib3 = ">=1.26.0,<3"
 
 
@@ -50,9 +50,9 @@ Flask = "2.2.5"
 optional = true
 
 [tool.poetry.group.docs.dependencies]
-sphinx = "^1.3.0"
+sphinx = ">=6,<8"
 sphinx-autodoc-typehints = "^1.3.0"
-sphinx-rtd-theme = "^1.3.0"
+sphinx-rtd-theme = ">=1.3,<4.0"
 backoff = ">=1.4.3"
 certifi = ">=2018.4.16"
 expiringdict = ">=1.1.4"
@@ -63,7 +63,7 @@ urllib3 = ">=1.26.0"
 jinja2 = "3.0.0"
 
 [tool.mypy]
-python_version = "3.8"
+python_version = "3.9"
 ignore_missing_imports = true
 install_types = true
 non_interactive = true