diff --git a/script/vendorize_deps b/script/vendorize_deps
index 27f1aa363..1353079cd 100755
--- a/script/vendorize_deps
+++ b/script/vendorize_deps
@@ -7,7 +7,7 @@ cd src/main/clojure/cljs
 
 DJSON_RELEASE="2.4.0"
 TRANSIT_RELEASE="1.0.329"
-TREADER_RELEASE="1.3.7"
+TREADER_RELEASE="1.4.2"
 
 rm -rf data.json
 git clone -b "v$DJSON_RELEASE" --depth 1 git@github.com:clojure/data.json.git
diff --git a/src/main/clojure/cljs/vendor/clojure/tools/reader.clj b/src/main/clojure/cljs/vendor/clojure/tools/reader.clj
index ca71aeab8..f5f3afd9e 100644
--- a/src/main/clojure/cljs/vendor/clojure/tools/reader.clj
+++ b/src/main/clojure/cljs/vendor/clojure/tools/reader.clj
@@ -27,6 +27,8 @@
            java.util.regex.Pattern
            (java.util List LinkedList)))
 
+(set! *warn-on-reflection* true)
+
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
 ;; helpers
 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
@@ -759,7 +761,7 @@
                   (ns-name *ns*)
 
                   (= \: (first token))
-                  (some-> token (subs 1) parse-symbol second' symbol resolve-ns ns-name)
+                  (some-> token (subs 1) parse-symbol second' symbol resolve-ns)
 
                   :else
                   (some-> token parse-symbol second'))]
@@ -1022,12 +1024,12 @@
   ([] (read+string (source-logging-push-back-reader *in*)))
   ([stream] (read+string stream true nil))
   ([^SourceLoggingPushbackReader stream eof-error? eof-value]
-   (let [^StringBuilder buf (doto (:buffer @(.source-log-frames stream)) (.setLength 0))
+   (let [^StringBuilder buf (doto ^StringBuilder (:buffer @(.source-log-frames stream)) (.setLength 0))
          o (log-source stream (read stream eof-error? eof-value))
          s (.trim (str buf))]
      [o s]))
   ([opts ^SourceLoggingPushbackReader stream]
-   (let [^StringBuilder buf (doto (:buffer @(.source-log-frames stream)) (.setLength 0))
+   (let [^StringBuilder buf (doto ^StringBuilder (:buffer @(.source-log-frames stream)) (.setLength 0))
          o (log-source stream (read opts stream))
          s (.trim (str buf))]
      [o s])))