diff --git a/build/config.mak b/build/config.mak
index a1735ada6..e4d9f3390 100644
--- a/build/config.mak
+++ b/build/config.mak
@@ -6,7 +6,7 @@ DEBUG ?= 0
 HOME_DISPLAY_EXTERNALS ?= 1
 EPSILON_VERSION ?= 15.5.0
 OMEGA_VERSION ?= 2.0.2
-UPSILON_VERSION ?= 1.1.0-dev
+UPSILON_VERSION ?= 1.1.1-dev
 # OMEGA_USERNAME ?= N/A
 OMEGA_STATE ?= dev
 EPSILON_APPS ?= calculation graph rpn code statistics probability solver atomic sequence regression reader settings external