diff --git a/src/resources/messages.ts b/src/resources/messages.ts
index c569defe..50d6f88b 100644
--- a/src/resources/messages.ts
+++ b/src/resources/messages.ts
@@ -395,7 +395,7 @@ export interface MessageCreateParamsBase {
     | 'claude-3-opus-20240229'
     | 'claude-3-sonnet-20240229'
     | 'claude-3-haiku-20240307'
-    | "claude-2.1'"
+    | 'claude-2.1'
     | 'claude-2.0'
     | 'claude-instant-1.2';
 
@@ -622,7 +622,7 @@ export interface MessageStreamParams {
     | 'claude-3-opus-20240229'
     | 'claude-3-sonnet-20240229'
     | 'claude-3-haiku-20240307'
-    | "claude-2.1'"
+    | 'claude-2.1'
     | 'claude-2.0'
     | 'claude-instant-1.2';