diff --git a/openapi.json b/openapi.json
index 4e35fbbe..4b62236c 100644
--- a/openapi.json
+++ b/openapi.json
@@ -3,7 +3,7 @@
     "info": {
         "title": "RCPCH Digital Growth API",
         "description": "Returns SDS and centiles for child growth measurements using growth references. Currently provides calculations based on the UK-WHO, Turner's Syndrome and Trisomy-21 references.",
-        "version": "3.1.0"
+        "version": "3.1.1"
     },
     "paths": {
         "/uk-who/calculation": {
diff --git a/tests/test_data/test_openapi.json b/tests/test_data/test_openapi.json
index 4e35fbbe..4b62236c 100644
--- a/tests/test_data/test_openapi.json
+++ b/tests/test_data/test_openapi.json
@@ -3,7 +3,7 @@
     "info": {
         "title": "RCPCH Digital Growth API",
         "description": "Returns SDS and centiles for child growth measurements using growth references. Currently provides calculations based on the UK-WHO, Turner's Syndrome and Trisomy-21 references.",
-        "version": "3.1.0"
+        "version": "3.1.1"
     },
     "paths": {
         "/uk-who/calculation": {