diff --git a/CHANGELOG.md b/CHANGELOG.md
index 139a21a5..7191c6e3 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,17 @@
 # Changelog
 
+## v6.4.0 (2023-12-11)
+
+### Feature
+
+- use external class for links on new datacite page
+- add a page about being a DataCite service provider
+
+### Fix
+
+- use /original endpoint for all iiif images, not just mss
+- expand acronyms
+
 ## v6.3.0 (2023-12-11)
 
 ### Feature
diff --git a/CITATION.cff b/CITATION.cff
index bbc5df65..deded66c 100644
--- a/CITATION.cff
+++ b/CITATION.cff
@@ -17,4 +17,4 @@ keywords:
   - ckanext
   - nhm
 license: GPL-3.0-or-later
-version: 6.3.0
+version: 6.4.0
diff --git a/ckanext/nhm/theme/package.json b/ckanext/nhm/theme/package.json
index f0c0cd5f..4935023c 100644
--- a/ckanext/nhm/theme/package.json
+++ b/ckanext/nhm/theme/package.json
@@ -1,6 +1,6 @@
 {
   "name": "ckanext-nhm",
-  "version": "6.3.0",
+  "version": "6.4.0",
   "description": "A CKAN extension for the Natural History Museum's Data Portal.",
   "repository": {
     "type": "git",
diff --git a/pyproject.toml b/pyproject.toml
index e5d13573..f66b0c35 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "ckanext-nhm"
-version = "6.3.0"
+version = "6.4.0"
 description = "A CKAN extension for the Natural History Museum's Data Portal."
 readme = "README.md"
 requires-python = ">=3.6"
@@ -74,7 +74,7 @@ exclude = ["tests", "docs"]
 
 [tool.commitizen]
 name = "cz_nhm"
-version = "6.3.0"
+version = "6.4.0"
 tag_format = "v$version"
 update_changelog_on_bump = true
 changelog_incremental = true