diff --git a/CITATION.cff b/CITATION.cff
index 92432b2..c8eff84 100644
--- a/CITATION.cff
+++ b/CITATION.cff
@@ -1,8 +1,8 @@
 cff-version: 1.2.0
 message: "If you use this package, please cite it as below."
 title: "mapmetadata"
-version: 3.0.1
-date-released: 2025-01-30
+version: 4.0.0
+date-released: 2025-02-18
 authors:
   - family-names: "Stickland"
     given-names: "Rachael"
diff --git a/DESCRIPTION b/DESCRIPTION
index 47d07b5..dd51ada 100644
--- a/DESCRIPTION
+++ b/DESCRIPTION
@@ -1,7 +1,7 @@
 Type: Package
 Package: mapmetadata
 Title: Map health metadata onto predefined research domains
-Version: 3.0.0
+Version: 4.0.0
 Authors@R: c(
     person("Rachael", "Stickland", , "rstickland@turing.ac.uk", role = c("aut", "cre"),
            comment = c(ORCID = "0000-0003-3398-4272")),
diff --git a/README.md b/README.md
index 05ae785..4b73841 100644
--- a/README.md
+++ b/README.md
@@ -124,7 +124,7 @@ For more information, refer to [GNU General Public License](https://www.gnu.org/
 
 To cite `mapmetadata` in publications:
 
-> Stickland R (2025). mapmetadata: map health metadata onto predefined research domains. R package version 3.0.0.
+> Stickland R (2025). mapmetadata: map health metadata onto predefined research domains. R package version 4.0.0.
 
 A BibTeX entry for LaTeX users:
 
@@ -133,7 +133,7 @@ A BibTeX entry for LaTeX users:
     title = {mapmetadata: map health metadata onto predefined research domains},
     author = {Rachael Stickland},
     year = {2025},
-    note = {R package version 3.0.0},
+    note = {R package version 4.0.0},
     doi = {https://doi.org/10.5281/zenodo.10581499}, 
   }
 ```
diff --git a/codemeta.json b/codemeta.json
index d16c716..edc3c01 100644
--- a/codemeta.json
+++ b/codemeta.json
@@ -7,7 +7,7 @@
   "codeRepository": "https://github.com/aim-rsf/mapmetadata",
   "issueTracker": "https://github.com/aim-rsf/mapmetadata/issues",
   "license": "https://spdx.org/licenses/GPL-3.0",
-  "version": "3.0.0",
+  "version": "4.0.0",
   "programmingLanguage": {
     "@type": "ComputerLanguage",
     "name": "R",
@@ -241,7 +241,7 @@
       "name": "mapmetadata: map health metadata onto predefined research domains",
       "identifier": "https://doi.org/10.5281/zenodo.10581499",
       "url": "https://github.com/aim-rsf/mapmetadata",
-      "description": "R package version 3.0.0",
+      "description": "R package version 4.0.0",
       "@id": "https://doi.org/10.5281/zenodo.10581499",
       "sameAs": "https://doi.org/10.5281/zenodo.10581499"
     }
diff --git a/inst/CITATION b/inst/CITATION
index 13f10c4..b0b5448 100644
--- a/inst/CITATION
+++ b/inst/CITATION
@@ -3,7 +3,7 @@ bibentry(
   title    = "mapmetadata: map health metadata onto predefined research domains",
   author = "Rachael Stickland",
   year  = 2025,
-  note = "R package version 3.0.0",
+  note = "R package version 4.0.0",
   doi = "https://doi.org/10.5281/zenodo.10581499",
   url = "https://github.com/aim-rsf/mapmetadata"
 )