diff --git a/api-client/build.gradle b/api-client/build.gradle
index 2af79178a..dfaef6e98 100644
--- a/api-client/build.gradle
+++ b/api-client/build.gradle
@@ -21,7 +21,7 @@ dependencies {
   // TODO: pin okhttp to a stable version. 5.x is needed for this fix:
   //  https://github.com/square/okhttp/issues/6258
   def okhttpVersion = '5.0.0-alpha.12'
-  def retrofitVersion = '2.9.0'
+  def retrofitVersion = '2.11.0'
 
   api "com.squareup.okhttp3:okhttp:$okhttpVersion"
   api "com.squareup.retrofit2:retrofit:$retrofitVersion"