diff --git a/CHANGELOG.md b/CHANGELOG.md
index c27f31d..7c4e385 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -2,6 +2,7 @@
 
 ## Unreleased
 
+- Python 3.5.10 is now available (CPython) (#1062).
 
 ## v177 (2020-08-18)
 
diff --git a/bin/default_pythons b/bin/default_pythons
index 67e4153..a0087df 100755
--- a/bin/default_pythons
+++ b/bin/default_pythons
@@ -9,7 +9,7 @@ DEFAULT_PYTHON_VERSION="python-3.6.12"
 LATEST_38="python-3.8.5"
 LATEST_37="python-3.7.9"
 LATEST_36="python-3.6.12"
-LATEST_35="python-3.5.9"
+LATEST_35="python-3.5.10"
 LATEST_34="python-3.4.10"
 LATEST_27="python-2.7.18"
 LATEST_PYPY_36="pypy3.6-7.3.1"
diff --git a/builds/runtimes/python-3.5.10 b/builds/runtimes/python-3.5.10
new file mode 100755
index 0000000..ad41723
--- /dev/null
+++ b/builds/runtimes/python-3.5.10
@@ -0,0 +1,4 @@
+#!/usr/bin/env bash
+# Build Path: /app/.heroku/python/
+
+source $(dirname $0)/python3
diff --git a/test/fixtures/python3_5/runtime.txt b/test/fixtures/python3_5/runtime.txt
index 435a592..5177718 100644
--- a/test/fixtures/python3_5/runtime.txt
+++ b/test/fixtures/python3_5/runtime.txt
@@ -1 +1 @@
-python-3.5.9
+python-3.5.10