diff --git a/Makefile b/Makefile
index c61ed41..313e58a 100644
--- a/Makefile
+++ b/Makefile
@@ -1,4 +1,10 @@
 ######      Build cbuild/default_tasks     #######
+
+all: build_exec
+
+rebuild_kerep:
+	@cbuild/call_task.sh rebuild_kerep
+
 build_exec: 
 	@cbuild/call_task.sh build_exec
 build_exec_dbg: 
@@ -19,6 +25,4 @@ exec: build_exec
 	@cbuild/call_task.sh exec
 
 valgrind: build_exec_dbg
-	@cbuild/call_task.sh valgrind
-
-all: build_exec
+	@cbuild/call_task.sh 
diff --git a/cbuild b/cbuild
index af91a89..cd6b3df 160000
--- a/cbuild
+++ b/cbuild
@@ -1 +1 @@
-Subproject commit af91a8927b5c33350af093d324c2106c9a193a1d
+Subproject commit cd6b3dfa1e2f6fc78257f55f611c13272f09686e
diff --git a/default.config b/default.config
index 52235aa..37c4ea7 100644
--- a/default.config
+++ b/default.config
@@ -1,6 +1,6 @@
 #!/bin/bash
 CBUILD_VERSION=3
-CONFIG_VERSION=4
+CONFIG_VERSION=5
 
 PROJECT=cobek
 echo "reading $PROJECT default config..."
@@ -20,6 +20,9 @@ OBJDIR=obj
 EXEC_FILE=cb2c.com
 
 case $TASK in
+    rebuild_kerep)
+        TASK_SCRIPT=tasks/rebuild_kerep.sh 
+        ;;
     build_exec)
         C_ARGS="-O2"
         CPP_ARGS="$C_ARGS"
diff --git a/kerep b/kerep
index f09aa09..fed82e5 160000
--- a/kerep
+++ b/kerep
@@ -1 +1 @@
-Subproject commit f09aa092c1eb4769ca83dfac2976dc3da21f9a5f
+Subproject commit fed82e58d30615379e811aa9068c9002c0576179
diff --git a/tasks/pre_build.sh b/tasks/pre_build.sh
index 9dcc12e..4f3a298 100755
--- a/tasks/pre_build.sh
+++ b/tasks/pre_build.sh
@@ -1,9 +1,13 @@
 #!/bin/bash
 
-cd kerep
-if [ ! -f "bin/kerep.a" ]; then
-    exec make "$KEREP_BUILD_TASK"
+if [ ! -f "kerep/bin/kerep.a" ]  || [ -f .rebuild_kerep ] 
+then
+    cd kerep
+    if ! make "$KEREP_BUILD_TASK"; then
+        exit 1
+    fi
+    cd ..
+    rm -rf .rebuild_kerep
 fi
-cp bin/kerep.a ../obj/
+cp kerep/bin/kerep.a obj/
 printf "${GREEN}copied ${CYAN}kerep.a\n"
-cd ..
diff --git a/tasks/rebuild_kerep.sh b/tasks/rebuild_kerep.sh
new file mode 100644
index 0000000..ea7e93b
--- /dev/null
+++ b/tasks/rebuild_kerep.sh
@@ -0,0 +1,3 @@
+#!/bin/bash
+touch .rebuild_kerep
+printf "kerep.a will be rebuilt in the next build task"