diff --git a/GNUmakefile b/GNUmakefile
index dbe17b5..79f3174 100644
--- a/GNUmakefile
+++ b/GNUmakefile
@@ -17,7 +17,7 @@ USR_CXXFLAGS += -std=c++17
 OPT_CXXFLAGS_YES = -O3
 
 # dependencies
-ecmc_VERSION = 11
+ecmc_VERSION = 11.0
 
 # ethercat
 #   debian 12