diff --git a/src/lib/openapi/spec/advanced-playground-request-schema.ts b/src/lib/openapi/spec/advanced-playground-request-schema.ts
index 161fba6607..47b68d533e 100644
--- a/src/lib/openapi/spec/advanced-playground-request-schema.ts
+++ b/src/lib/openapi/spec/advanced-playground-request-schema.ts
@@ -11,7 +11,12 @@ export const advancedPlaygroundRequestSchema = {
     properties: {
         environments: {
             type: 'array',
-            items: { type: 'string' },
+            items: {
+                type: 'string',
+                minLength: 1,
+                pattern: '^[a-zA-Z0-9~_.-]+$',
+            },
+            minItems: 1,
             example: ['development', 'production'],
             description: 'The environments to evaluate toggles in.',
         },
diff --git a/src/test/e2e/api/openapi/__snapshots__/openapi.e2e.test.ts.snap b/src/test/e2e/api/openapi/__snapshots__/openapi.e2e.test.ts.snap
index 06d996d4e7..69352dc914 100644
--- a/src/test/e2e/api/openapi/__snapshots__/openapi.e2e.test.ts.snap
+++ b/src/test/e2e/api/openapi/__snapshots__/openapi.e2e.test.ts.snap
@@ -843,8 +843,11 @@ The provider you choose for your addon dictates what properties the \`parameters
               "production",
             ],
             "items": {
+              "minLength": 1,
+              "pattern": "^[a-zA-Z0-9~_.-]+$",
               "type": "string",
             },
+            "minItems": 1,
             "type": "array",
           },
           "projects": {