diff --git a/.ruby-version b/.ruby-version
index ef538c281..9c25013db 100644
--- a/.ruby-version
+++ b/.ruby-version
@@ -1 +1 @@
-3.1.2
+3.3.6
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 69d0052cf..64728ef74 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,8 +4,16 @@
 
 [Full changelog][unreleased]
 
+## Release 151 - 2024-11-26
+
+[Full changelog][151]
+
+- Update Ruby to 3.3.6
+
 ## Release 150 - 2024-11-25
 
+[Full changelog][150]
+
 - Separate out users into tabbed view of active and inactive
 
 ## Release 149 - 2024-11-21
@@ -1699,7 +1707,8 @@
 - Planned start and end dates are mandatory
 - Actual start and end dates must not be in the future
 
-[unreleased]: https://github.com/UKGovernmentBEIS/beis-report-official-development-assistance/compare/release-150...HEAD
+[unreleased]: https://github.com/UKGovernmentBEIS/beis-report-official-development-assistance/compare/release-151...HEAD
+[151]: https://github.com/UKGovernmentBEIS/beis-report-official-development-assistance/compare/release-150...release-151
 [150]: https://github.com/UKGovernmentBEIS/beis-report-official-development-assistance/compare/release-149...release-150
 [149]: https://github.com/UKGovernmentBEIS/beis-report-official-development-assistance/compare/release-148...release-149
 [148]: https://github.com/UKGovernmentBEIS/beis-report-official-development-assistance/compare/release-147...release-148
diff --git a/Dockerfile b/Dockerfile
index 6370101d8..8a5a62e03 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,7 +1,7 @@
 # ------------------------------------------------------------------------------
 # base
 # ------------------------------------------------------------------------------
-FROM ruby:3.1.2 AS base
+FROM ruby:3.3.6 AS base
 
 ARG RAILS_ENV
 ARG NODE_MAJOR
diff --git a/Gemfile.lock b/Gemfile.lock
index e3fac66e3..b57a6c626 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -613,7 +613,7 @@ DEPENDENCIES
   wicked
 
 RUBY VERSION
-   ruby 3.1.2p20
+   ruby 3.3.6
 
 BUNDLED WITH
    2.4.22