diff --git a/.github/workflows/tests.yaml b/.github/workflows/tests.yaml
index 45e7ac5..70bc93b 100644
--- a/.github/workflows/tests.yaml
+++ b/.github/workflows/tests.yaml
@@ -8,7 +8,6 @@ name: tests
 jobs:
 
   misc:
-#    name: "Linting configs and git"
     name: "Linting configs"
     runs-on: ubuntu-latest
     steps:
@@ -28,16 +27,10 @@ jobs:
       - name: "Lint YAMLs"
         run: |
           tox -e lint-yaml
-#      - name: "Lint git"
-#        run: |
-#          tox -e lint-git
 
   lint:
-#    name: "Linting and type checking"
     name: "Linting"
     runs-on: ubuntu-24.04
-#    strategy:
-#      fail-fast: true
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
@@ -49,7 +42,7 @@ jobs:
       - name: "Lint formatting"
         run: |
           tox -e lint-py
-#      - name: "Type checking"
+#      - name: "Type checking" TODO(trin94): revisit linter config and re-enable
 #        run: |
 #          tox -e lint-mypy
 
@@ -74,7 +67,7 @@ jobs:
     strategy:
       fail-fast: true
       matrix:
-        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13", "3.14"]
+        python-version: ["3.10", "3.11", "3.12", "3.13", "3.14"]
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
diff --git a/CHANGES.md b/CHANGES.md
index 0fc08e7..e408a59 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -1,6 +1,9 @@
 python-inject changes
 =====================
 
+### 5.5.0 (unreleased)
+- Drop Python 3.9 support (end of life). Minimum supported version is now 3.10.
+
 ### 5.4.1 (2026-07-27)
 - Fix static typing of inject.attr(Cls), #136
 
diff --git a/README.md b/README.md
index aee6902..b352d9b 100644
--- a/README.md
+++ b/README.md
@@ -10,14 +10,14 @@ Dependency injection the python way, the good way.
 * Transparently integrates into tests.
 * Autoparams leveraging type annotations.
 * Supports type hinting in Python 3.5+.
-* Supports Python 3.9+ (`v5.*`), 3.5-3.8 (`v4.*`) and Python 2.7–3.5 (`v3.*`).
 * Supports context managers.
 
 ## Python Support
 
 | Python  | Inject Version |
 |---------|----------------|
-| 3.9+    | 5.0+           |
+| 3.10+   | 5.5+           |
+| 3.9     | 5.0 - 5.4      |
 | 3.6-3.8 | 4.1+, < 5.0    |
 | 3.5     | 4.0            |
 | < 3.5   | 3.*            |
diff --git a/pyproject.toml b/pyproject.toml
index 86fa6c8..5aee125 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -13,7 +13,6 @@ classifiers = [
   "Operating System :: OS Independent",
   "Programming Language :: Python",
   "Programming Language :: Python :: 3",
-  "Programming Language :: Python :: 3.9",
   "Programming Language :: Python :: 3.10",
   "Programming Language :: Python :: 3.11",
   "Programming Language :: Python :: 3.12",
@@ -22,7 +21,7 @@ classifiers = [
   "Topic :: Software Development :: Libraries :: Python Modules",
 ]
 
-requires-python = ">=3.9"
+requires-python = ">=3.10"
 dependencies = []
 
 [project.urls]
@@ -183,55 +182,6 @@ ban-relative-imports = "all"
 quote-style = "double"
 indent-style = "space"
 
-#ignore = [
-#  "B027",   # Allow non-abstract empty methods in abstract base classes
-#  "FBT003", # Allow boolean positional values in function calls, like `dict.get(... True)`
-#  # Ignore checks for possible passwords
-#  "S105",
-#  "S106",
-#  "S107",
-#  # Ignore complexity
-#  "C901",
-#  "PLR0911",
-#  "PLR0912",
-#  "PLR0913",
-#  "PLR0915",
-#  "PLC1901", # empty string comparisons
-#  "PLW2901", # `for` loop variable overwritten
-#  "SIM114",  # Combine `if` branches using logical `or` operator
-#]
-#select = [
-#  "A",
-#  "B",
-#  "C",
-#  "DTZ",
-#  "E",
-#  "EM",
-#  "F",
-#  "FBT",
-#  "I",
-#  "ICN",
-#  "ISC",
-#  "N",
-#  "PLC",
-#  "PLE",
-#  "PLR",
-#  "PLW",
-#  "Q",
-#  "RUF",
-#  "S",
-#  "SIM",
-#  "T",
-#  "TID",
-#  "UP",
-#  "W",
-#  "YTT",
-#]
-#unfixable = [
-#  "F401", # Don't touch unused imports
-#]
-
-
 ####  Pytest & Coverage  ####
 [tool.pytest.ini_options]
 minversion = "8.4"
@@ -267,11 +217,11 @@ runner = "uv-venv-lock-runner"
 skip_missing_interpreters = true
 
 env_list = [
-  "py39",
   "py310",
   "py311",
   "py312",
   "py313",
+  "py314",
   "fmt-py",
   "fmt-toml",
   "lint-py",
@@ -279,7 +229,6 @@ env_list = [
   #"lint-mypy",  # TODO(pyctrl): make it green & uncomment
   "lint-toml",
   "lint-yaml",
-  #"lint-git",
   "coverage",
 ]
 
@@ -294,7 +243,6 @@ lint = [
   #"lint-mypy",  # TODO(pyctrl): make it green & uncomment
   "lint-toml",
   "lint-yaml",
-  #"lint-git",
 ]
 
 # default env