diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c3e7be7d..75db59d0 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -14,7 +14,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ["3.11", "3.12", "3.13", "3.14", "3.15"]
+        python-version: ["3.14", "3.15"]
 
     steps:
       - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
diff --git a/Dockerfile b/Dockerfile
index 7e1d597d..e803fac1 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:3.11-slim
+FROM python:3.15-slim
 
 ENV PYTHONUNBUFFERED=1
 
diff --git a/runtime.txt b/runtime.txt
deleted file mode 100644
index 76b6e496..00000000
--- a/runtime.txt
+++ /dev/null
@@ -1 +0,0 @@
-python-3.11.6
diff --git a/tox.ini b/tox.ini
index 8ea74119..c3d1a59b 100644
--- a/tox.ini
+++ b/tox.ini
@@ -2,7 +2,7 @@
 requires =
     tox>=4.2
 env_list =
-    py{315, 314, 313, 312, 311}
+    py{315, 314}
 
 [testenv]
 skip_install = true