diff --git a/project.clj b/project.clj
index 07cdfa04..683045c8 100644
--- a/project.clj
+++ b/project.clj
@@ -12,6 +12,7 @@
   :dependencies [[org.clojure/clojure "1.10.1"]
                  [org.clojure/tools.reader "1.3.2"]
                  [borkdude/edamame "0.0.10-alpha.2"]
+                 [borkdude/graal.locking "0.0.2"]
                  [org.clojure/core.async "0.4.500"]
                  [org.clojure/tools.cli "0.4.2"]
                  [org.clojure/data.csv "0.1.4"]
diff --git a/sci b/sci
index 6535d143..a6286ce3 160000
--- a/sci
+++ b/sci
@@ -1 +1 @@
-Subproject commit 6535d1437470dad90751278f17c262c3e9198c81
+Subproject commit a6286ce315452137057d40c1cdc127091a6429a3
diff --git a/src/babashka/main.clj b/src/babashka/main.clj
index 30b86abe..a1318f4c 100644
--- a/src/babashka/main.clj
+++ b/src/babashka/main.clj
@@ -25,9 +25,9 @@
    [sci.impl.interpreter :refer [eval-string*]])
   (:gen-class))
 
-(sci.impl.vars/bindRoot sci/in *in*)
-(sci.impl.vars/bindRoot sci/out *out*)
-(sci.impl.vars/bindRoot sci/err *err*)
+(sci/alter-var-root sci/in (constantly *in*))
+(sci/alter-var-root sci/out (constantly *out*))
+(sci/alter-var-root sci/err (constantly *err*))
 
 (set! *warn-on-reflection* true)
 ;; To detect problems when generating the image, run: