diff --git a/CHANGELOG.md b/CHANGELOG.md
index 56a05e21..c6ec70c7 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,11 @@ A preview of the next release can be installed from
 
 [Babashka](https://github.com/babashka/babashka): Native, fast starting Clojure interpreter for scripting
 
+## Unreleased
+
+- Upgrade SCI reflector based on clojure 1.12 and remove specific workaround for
+  `Thread/sleep` interop
+
 ## 1.4.192 (2024-09-12)
 
 - Upgrade Clojure to `1.12.0`
diff --git a/project.clj b/project.clj
index edfc0d55..8be833c6 100644
--- a/project.clj
+++ b/project.clj
@@ -27,7 +27,7 @@
                  [org.clojure/tools.cli "1.0.214"]
                  [cheshire "5.13.0"]
                  [nrepl/bencode "1.2.0"]
-                 [borkdude/sci.impl.reflector "0.0.1"]
+                 [borkdude/sci.impl.reflector "0.0.2"]
                  [org.babashka/sci.impl.types "0.0.2"]
                  [org.babashka/babashka.impl.java "0.1.8"]
                  [org.clojure/core.async "1.6.673"]
diff --git a/sci b/sci
index 337d6c67..0da3ffc6 160000
--- a/sci
+++ b/sci
@@ -1 +1 @@
-Subproject commit 337d6c674fcf2a9bc5d71fe11b47a9fe350ad976
+Subproject commit 0da3ffc6a5873e5cd2bb864ebc80beaeddb11f0c
diff --git a/src/babashka/impl/classes.clj b/src/babashka/impl/classes.clj
index dcf7e6e5..a8821946 100644
--- a/src/babashka/impl/classes.clj
+++ b/src/babashka/impl/classes.clj
@@ -664,19 +664,7 @@
                                                        ([_# ^String class-name#]
                                                         (Class/forName class-name#))
                                                        ([_# ^String class-name# initialize# ^java.lang.ClassLoader clazz-loader#]
-                                                        (Class/forName class-name#)))})
-                                            (= 'java.lang.Thread c)
-                                            (assoc :static-methods
-                                                   {(list 'quote 'sleep)
-                                                    `(fn
-                                                       ([_# x#]
-                                                        (if (instance? Number x#)
-                                                          (let [x# (long x#)]
-                                                            (Thread/sleep x#))
-                                                          (let [^java.time.Duration x# x#]
-                                                            (Thread/sleep x#))))
-                                                       ([_# ^java.lang.Long millis# ^java.lang.Long nanos#]
-                                                        (Thread/sleep millis# nanos#)))}))]]
+                                                        (Class/forName class-name#)))}))]]
                    c))
         m (assoc m :public-class
                  (fn [v]
diff --git a/test/babashka/interop_test.clj b/test/babashka/interop_test.clj
index 83fc4faa..096f0bca 100644
--- a/test/babashka/interop_test.clj
+++ b/test/babashka/interop_test.clj
@@ -52,8 +52,7 @@
   (is (pos? (bb nil "(.count (.codePoints \"woof🐕\"))"))))
 
 (deftest Thread-sleep-test
-  (is (bb nil "(Thread/sleep (/ 1 200))
-               (Thread/sleep (/ 1 200) (/ 1 200))
+  (is (bb nil "(Thread/sleep (int 1))
                (Thread/sleep (java.time.Duration/ofMillis 1))
                true")))