diff --git a/.github/workflows/workflow.yml b/.github/workflows/workflow.yml
index bb23c9f..3184c72 100644
--- a/.github/workflows/workflow.yml
+++ b/.github/workflows/workflow.yml
@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.7', '3.8', '3.9', '3.10', '3.11', '3.12']
+        python-version: ['3.8', '3.9', '3.10', '3.11', '3.12']
     steps:
     - uses: actions/checkout@v3
     - name: Set up Python ${{ matrix.python-version }}
diff --git a/README.rst b/README.rst
index 0bbaaea..5063382 100644
--- a/README.rst
+++ b/README.rst
@@ -58,7 +58,7 @@ or conda::
 
   $ conda install czml3 --channel conda-forge
 
-czml3 requires Python >= 3.7.
+czml3 requires Python >= 3.8.
 
 Examples
 ========
diff --git a/pyproject.toml b/pyproject.toml
index e700a14..a247787 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -17,11 +17,10 @@ select = [
 [tool.tox]
 legacy_tox_ini = """
     [tox]
-    envlist = quality, test, pypy, pypy3, py{37,38,39,310,311,312}
+    envlist = quality, test, pypy, pypy3, py{38,39,310,311,312}
 
     [gh-actions]
     python =
-        3.7: py37
         3.8: py38
         3.9: py39
         3.10: py310
@@ -32,7 +31,6 @@ legacy_tox_ini = """
     basepython =
         pypy: {env:PYTHON:pypy}
         pypy3: {env:PYTHON:pypy3}
-        py37: {env:PYTHON:python3.7}
         py38: {env:PYTHON:python3.8}
         py39: {env:PYTHON:python3.9}
         py310: {env:PYTHON:python3.10}
@@ -83,7 +81,7 @@ authors = [
 ]
 description = "Python 3 library to write CZML"
 readme = "README.rst"
-requires-python = ">=3.7"
+requires-python = ">=3.8"
 keywords = ["czml", "cesium", "orbits"]
 license = {text = "MIT"}
 classifiers = [
@@ -93,7 +91,6 @@ classifiers = [
     "Operating System :: OS Independent",
     "Programming Language :: Python",
     "Programming Language :: Python :: 3",
-    "Programming Language :: Python :: 3.7",
     "Programming Language :: Python :: 3.8",
     "Programming Language :: Python :: 3.9",
     "Programming Language :: Python :: 3.10",