diff --git a/src/prelude/dict.ts b/src/prelude/dict.ts
index b3ee271..9642a15 100644
--- a/src/prelude/dict.ts
+++ b/src/prelude/dict.ts
@@ -1,9 +1,16 @@
+import { type Value, toString, toValue } from 'reefvm'
+
 export const dict = {
   keys: (dict: Record<string, any>) => Object.keys(dict),
   values: (dict: Record<string, any>) => Object.values(dict),
   entries: (dict: Record<string, any>) => Object.entries(dict).map(([k, v]) => ({ key: k, value: v })),
   'has?': (dict: Record<string, any>, key: string) => key in dict,
   get: (dict: Record<string, any>, key: string, defaultValue: any = null) => dict[key] ?? defaultValue,
+  set: (dict: Value, key: Value, value: Value) => {
+    const map = dict.value as Map<string, Value>
+    map.set(toString(key), value)
+    return dict
+  },
   merge: (...dicts: Record<string, any>[]) => Object.assign({}, ...dicts),
   'empty?': (dict: Record<string, any>) => Object.keys(dict).length === 0,
   map: async (dict: Record<string, any>, cb: Function) => {
@@ -22,3 +29,7 @@ export const dict = {
   },
   'from-entries': (entries: [string, any][]) => Object.fromEntries(entries),
 }
+
+  // raw functions deal directly in Value types, meaning we can modify collection
+  // careful - the MUST return a Value!
+  ; (dict.set as any).raw = true
diff --git a/src/prelude/tests/prelude.test.ts b/src/prelude/tests/prelude.test.ts
index 90ea2c6..e19e18e 100644
--- a/src/prelude/tests/prelude.test.ts
+++ b/src/prelude/tests/prelude.test.ts
@@ -471,6 +471,12 @@ describe('dict operations', () => {
     await expect(`dict.get [a=1] 'b' 99`).toEvaluateTo(99, globals)
   })
 
+  test('dict.set sets value', async () => {
+    await expect(`map = [a=1]; dict.set map 'b' 99; map.b`).toEvaluateTo(99, globals)
+    await expect(`map = [a=1]; dict.set map 'a' 100; map.a`).toEvaluateTo(100, globals)
+  })
+
+
   test('dict.empty? checks if dict is empty', async () => {
     await expect(`dict.empty? [=]`).toEvaluateTo(true, globals)
     await expect(`dict.empty? [a=1]`).toEvaluateTo(false, globals)