diff --git a/version_config.cmake b/version_config.cmake
index fc4d074c..f4af8daa 100644
--- a/version_config.cmake
+++ b/version_config.cmake
@@ -187,7 +187,7 @@ if (DEVEL_BUILD)
   set(DEFAULT_CCPi-Astra_TAG origin/master)
 
 else()
-  set(DEFAULT_SIRF_TAG v2.1.0-rc.3)
+  set(DEFAULT_SIRF_TAG v2.1.0)
 
   ## STIR
   set(DEFAULT_STIR_URL https://github.com/UCL/STIR )