diff --git a/.changes/next-release/feature-AmazonPersonalize-549c9e5.json b/.changes/next-release/feature-AmazonPersonalize-549c9e5.json
new file mode 100644
index 000000000000..3dc8ec616eac
--- /dev/null
+++ b/.changes/next-release/feature-AmazonPersonalize-549c9e5.json
@@ -0,0 +1,6 @@
+{
+    "type": "feature",
+    "category": "Amazon Personalize",
+    "contributor": "",
+    "description": "Update regex validation in kmsKeyArn and s3 path API parameters for AWS Personalize APIs"
+}
diff --git a/services/personalize/src/main/resources/codegen-resources/service-2.json b/services/personalize/src/main/resources/codegen-resources/service-2.json
index 8092ac34cee0..69802bd99937 100644
--- a/services/personalize/src/main/resources/codegen-resources/service-2.json
+++ b/services/personalize/src/main/resources/codegen-resources/service-2.json
@@ -2713,7 +2713,10 @@
       "max":150,
       "min":1
     },
-    "KmsKeyArn":{"type":"string"},
+    "KmsKeyArn":{
+      "type":"string",
+      "pattern":"arn:aws.*:kms:.*:[0-9]{12}:key/.*"
+    },
     "LimitExceededException":{
       "type":"structure",
       "members":{
@@ -3271,7 +3274,8 @@
     },
     "S3Location":{
       "type":"string",
-      "max":256
+      "max":256,
+      "pattern":"(s3|http|https)://.+"
     },
     "Schemas":{
       "type":"list",