diff --git a/.gitignore b/.gitignore
index d94278b..c681ec6 100644
--- a/.gitignore
+++ b/.gitignore
@@ -48,3 +48,4 @@ hs_err_pid*
 .project
 .settings/
 
+.tox/
diff --git a/.python-version b/.python-version
index a5c4c76..2c20ac9 100644
--- a/.python-version
+++ b/.python-version
@@ -1 +1 @@
-3.9.0
+3.13.3
diff --git a/Dockerfile b/Dockerfile
index 1fe259d..6646407 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:3
+FROM python:3.13
 
 LABEL maintainer="Jeffrey Phillips Freeman jeffrey.freeman@cleverthis.com"
 
@@ -12,7 +12,7 @@ RUN apt update -y && \
     apt-get dist-upgrade -y && \
     apt-get install -y --no-install-recommends \
       libssl-dev \
-      libreadline-gplv2-dev \
+      libreadline-dev \
       libncursesw5-dev \
       libssl-dev \
       libsqlite3-dev \
@@ -24,18 +24,22 @@ RUN apt update -y && \
     apt-get clean && \
     rm -r /var/lib/apt/lists/*
 
-#RUN pyenv install 2.7.18 && \
-#    pyenv install 3.3.7 && \
-#    pyenv install 3.4.10 && \
-#    pyenv install 3.5.10 && \
-#    pyenv install 3.9.0 && \
-#    pyenv install pypy-5.7.1
+RUN pyenv install 3.13.3 && \
+    pyenv install 3.12.10 && \
+    pyenv install 3.11.12 && \
+    pyenv install 3.10.17 && \
+    pyenv install 3.9.21 && \
+    pyenv install 3.8.20 && \
+    pyenv install pypy-7.3.19 && \
+    pyenv global 3.13.3 && \
+    pyenv global 3.12.10 && \
+    pyenv global 3.11.12 && \
+    pyenv global 3.10.17 && \
+    pyenv global 3.9.21 && \
+    pyenv global 3.8.20 && \
+    pyenv global pypy-7.3.19
 
-RUN pyenv install 3.9.0 && \
-    pyenv install 2.7.18 && \
-    pyenv global 2.7.18 && \
-    pyenv global 3.9.0
-RUN /.pyenv/versions/3.9.0/bin/python3.9 -m pip install --upgrade pip
+RUN /.pyenv/versions/3.13.3/bin/python3.13 -m pip install --upgrade pip
 RUN pip install tox
 
 RUN mkdir -p /usr/src/boilerplate && \
diff --git a/tox.ini b/tox.ini
index 5fb5b6b..52efdfd 100644
--- a/tox.ini
+++ b/tox.ini
@@ -3,14 +3,14 @@ envlist =
     clean,
     build,
     check,
-    3.9-cover,
-    3.9-nocov,
+    3.13-cover,
+    3.13-nocov,
     report,
     docs
 
 [testenv]
 basepython =
-    {clean,check,report,extension-coveralls,coveralls,codecov,docs,spell,build}: python3.9
+    {clean,check,report,extension-coveralls,coveralls,codecov,docs,spell,build}: python3.13
 setenv =
     PYTHONPATH={toxinidir}/tests
     PYTHONUNBUFFERED=yes
@@ -112,11 +112,11 @@ usedevelop = false
 deps = coverage
 
 
-[testenv:3.9-nocov]
-basepython = {env:TOXPYTHON:python3.9}
+[testenv:3.13-nocov]
+basepython = {env:TOXPYTHON:python3.13}
 
-[testenv:3.9-cover]
-basepython = {env:TOXPYTHON:python3.9}
+[testenv:3.13-cover]
+basepython = {env:TOXPYTHON:python3.13}
 setenv =
     {[testenv]setenv}
     WITH_COVERAGE=yes