diff --git a/CHANGELOG.md b/CHANGELOG.md
index 05e9005c..9ee9a779 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,6 @@
+### 1.45.X - 2026-X
+- Update Array filter multi-value delimiter to ';' to match IN/NOT IN filter types to allow filter type conversion
+
 ### 1.45.0 - 2026-01-20
 - Add Array filter types
   - ARRAY_CONTAINS_ALL, ARRAY_CONTAINS_ANY, ARRAY_CONTAINS_EXACT, ARRAY_CONTAINS_NOT_EXACT, ARRAY_ISEMPTY, ARRAY_ISNOTEMPTY
diff --git a/package-lock.json b/package-lock.json
index 3e65847d..e8f82a56 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
   "name": "@labkey/api",
-  "version": "1.45.0",
+  "version": "1.45.1-fb-mvtc-convert.1",
   "lockfileVersion": 3,
   "requires": true,
   "packages": {
     "": {
       "name": "@labkey/api",
-      "version": "1.45.0",
+      "version": "1.45.1-fb-mvtc-convert.1",
       "license": "Apache-2.0",
       "devDependencies": {
         "@babel/core": "7.28.5",
diff --git a/package.json b/package.json
index c0e58013..a385e000 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@labkey/api",
-  "version": "1.45.0",
+  "version": "1.45.1-fb-mvtc-convert.1",
   "description": "JavaScript client API for LabKey Server",
   "scripts": {
     "build": "npm run build:dist && npm run build:docs",
diff --git a/src/labkey/filter/Types.ts b/src/labkey/filter/Types.ts
index 4bfff098..fa78dd15 100644
--- a/src/labkey/filter/Types.ts
+++ b/src/labkey/filter/Types.ts
@@ -128,13 +128,13 @@ export const Types: Record<string, IFilterType> = {
     // These operators require a data value
     //
 
-    ARRAY_CONTAINS_ALL: registerFilterType('Contains All', null, 'arraycontainsall', true, ',', 'Contains All Of'),
+    ARRAY_CONTAINS_ALL: registerFilterType('Contains All', null, 'arraycontainsall', true, ';', 'Contains All Of'),
     ARRAY_CONTAINS_ANY: registerFilterType(
         'Contains Any',
         null,
         'arraycontainsany',
         true,
-        ',',
+        ';',
         'Contains At Least One Of'
     ),
     ARRAY_CONTAINS_EXACT: registerFilterType(
@@ -142,7 +142,7 @@ export const Types: Record<string, IFilterType> = {
         null,
         'arraymatches',
         true,
-        ',',
+        ';',
         'Contains Exactly the Selected Values'
     ),
     ARRAY_CONTAINS_NOT_EXACT: registerFilterType(
@@ -150,10 +150,10 @@ export const Types: Record<string, IFilterType> = {
         null,
         'arraynotmatches',
         true,
-        ',',
+        ';',
         'Does Not Contains Exactly the Selected Values'
     ),
-    ARRAY_CONTAINS_NONE: registerFilterType('Contains None', null, 'arraycontainsnone', true, ',', 'Contains None Of'),
+    ARRAY_CONTAINS_NONE: registerFilterType('Contains None', null, 'arraycontainsnone', true, ';', 'Contains None Of'),
 
     EQUAL,
     DATE_EQUAL: registerFilterType(
diff --git a/src/test/data/filter_types_snapshot.json b/src/test/data/filter_types_snapshot.json
index 103b7a3d..6b1293da 100644
--- a/src/test/data/filter_types_snapshot.json
+++ b/src/test/data/filter_types_snapshot.json
@@ -7,7 +7,7 @@
     "getMultiValueFilter": null,
     "getMultiValueMaxOccurs": "undefined",
     "getMultiValueMinOccurs": "undefined",
-    "getMultiValueSeparator": ",",
+    "getMultiValueSeparator": ";",
     "getOpposite": null,
     "getSingleValueFilter": "undefined",
     "getURLParameterValue": "undefined",
@@ -24,7 +24,7 @@
     "getMultiValueFilter": null,
     "getMultiValueMaxOccurs": "undefined",
     "getMultiValueMinOccurs": "undefined",
-    "getMultiValueSeparator": ",",
+    "getMultiValueSeparator": ";",
     "getOpposite": null,
     "getSingleValueFilter": "undefined",
     "getURLParameterValue": "undefined",
@@ -41,7 +41,7 @@
     "getMultiValueFilter": null,
     "getMultiValueMaxOccurs": "undefined",
     "getMultiValueMinOccurs": "undefined",
-    "getMultiValueSeparator": ",",
+    "getMultiValueSeparator": ";",
     "getOpposite": null,
     "getSingleValueFilter": "undefined",
     "getURLParameterValue": "undefined",
@@ -58,7 +58,7 @@
     "getMultiValueFilter": null,
     "getMultiValueMaxOccurs": "undefined",
     "getMultiValueMinOccurs": "undefined",
-    "getMultiValueSeparator": ",",
+    "getMultiValueSeparator": ";",
     "getOpposite": null,
     "getSingleValueFilter": "undefined",
     "getURLParameterValue": "undefined",
@@ -75,7 +75,7 @@
     "getMultiValueFilter": null,
     "getMultiValueMaxOccurs": "undefined",
     "getMultiValueMinOccurs": "undefined",
-    "getMultiValueSeparator": ",",
+    "getMultiValueSeparator": ";",
     "getOpposite": null,
     "getSingleValueFilter": "undefined",
     "getURLParameterValue": "undefined",