diff --git a/.changes/unreleased/Breaking Changes-20241021-115548.yaml b/.changes/unreleased/Breaking Changes-20241021-115548.yaml
new file mode 100644
index 0000000000..590cb55ad1
--- /dev/null
+++ b/.changes/unreleased/Breaking Changes-20241021-115548.yaml	
@@ -0,0 +1,6 @@
+kind: Breaking Changes
+body: Require Python `>=3.9`
+time: 2024-10-21T11:55:48.188883-07:00
+custom:
+  Author: plypaul
+  Issue: "1470"
diff --git a/.github/workflows/ci-metricflow-unit-tests.yaml b/.github/workflows/ci-metricflow-unit-tests.yaml
index 14cf9fea68..072945cd35 100644
--- a/.github/workflows/ci-metricflow-unit-tests.yaml
+++ b/.github/workflows/ci-metricflow-unit-tests.yaml
@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.8", "3.12"]
+        python-version: ["3.9", "3.12"]
     steps:
       - name: Check-out the repo
         uses: actions/checkout@v3
@@ -68,7 +68,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [ "3.8", "3.12" ]
+        python-version: [ "3.9", "3.12" ]
     steps:
 
       - name: Check-out the repo
diff --git a/metricflow-semantics/pyproject.toml b/metricflow-semantics/pyproject.toml
index 6ac8e6293f..b231925a93 100644
--- a/metricflow-semantics/pyproject.toml
+++ b/metricflow-semantics/pyproject.toml
@@ -7,7 +7,7 @@ name = "metricflow-semantics"
 version = "0.1.0"
 description = "Modules for semantic understanding of a MetricFlow query."
 readme = "README.md"
-requires-python = ">=3.8,<3.13"
+requires-python = ">=3.9,<3.13"
 license = "BUSL-1.1"
 authors = [
   { name = "dbt Labs", email = "info@dbtlabs.com" },
@@ -16,7 +16,6 @@ authors = [
 classifiers = [
   "Development Status :: 4 - Beta",
   "Programming Language :: Python",
-  "Programming Language :: Python :: 3.8",
   "Programming Language :: Python :: 3.9",
   "Programming Language :: Python :: 3.10",
   "Programming Language :: Python :: 3.11",
diff --git a/pyproject.toml b/pyproject.toml
index 65f43600cf..94f4b921f1 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -7,7 +7,7 @@ name = "metricflow"
 version = "0.207.0.dev2"
 description = "Translates a simple metric definition into reusable SQL and executes it against the SQL engine of your choice."
 readme = "README.md"
-requires-python = ">=3.8,<3.13"
+requires-python = ">=3.9,<3.13"
 license = "BUSL-1.1"
 keywords = []
 authors = [
@@ -17,7 +17,6 @@ authors = [
 classifiers = [
   "Development Status :: 4 - Beta",
   "Programming Language :: Python",
-  "Programming Language :: Python :: 3.8",
   "Programming Language :: Python :: 3.9",
   "Programming Language :: Python :: 3.10",
   "Programming Language :: Python :: 3.11",