diff --git a/bb/graal_tests.clj b/bb/graal_tests.clj
index b8c00d6f..3397ebea 100755
--- a/bb/graal_tests.clj
+++ b/bb/graal_tests.clj
@@ -28,7 +28,9 @@
   (let [graalvm-home (System/getenv "GRAALVM_HOME")
         bin-dir (str (fs/file graalvm-home "bin"))]
     (shell (executable bin-dir "gu") "install" "native-image")
-    (shell (executable bin-dir "native-image") "-jar" "target/graal-tests.jar" "--no-fallback" "graal_tests")))
+    (shell (executable bin-dir "native-image")
+      "--features=clj_easy.graal_build_time.InitClojureClasses"
+      "--no-fallback" "-jar" "target/graal-tests.jar" "graal_tests")))
 
 (defn run-tests []
   (let [{:keys [out]} (shell {:out :string} (executable "." "graal_tests"))]
diff --git a/src/taoensso/nippy.clj b/src/taoensso/nippy.clj
index decf6197..626671fc 100644
--- a/src/taoensso/nippy.clj
+++ b/src/taoensso/nippy.clj
@@ -25,7 +25,7 @@
     PersistentQueue PersistentTreeMap PersistentTreeSet PersistentList
     LazySeq IRecord ISeq IType]))
 
-(enc/assert-min-encore-version [3 58 0])
+(enc/assert-min-encore-version [3 67 0])
 
 (comment
   (set! *unchecked-math* :warn-on-boxed)
@@ -471,8 +471,8 @@
           (or
             (when-let [s
                        (or
-                         (do                (enc/get-sys-val (get-in ids [action  :base :prop]) (get-in ids [action  :base :env])))
-                         (when incl-legacy? (enc/get-sys-val (get-in ids [:legacy :base :prop]) (get-in ids [:legacy :base :env]))))]
+                         (do                (enc/get-sys-val* (get-in ids [action  :base :prop]) (get-in ids [action  :base :env])))
+                         (when incl-legacy? (enc/get-sys-val* (get-in ids [:legacy :base :prop]) (get-in ids [:legacy :base :env]))))]
 
               (if (allow-and-record? s) s (split-class-names>set s)))
             default)
@@ -480,8 +480,8 @@
           allowlist-add
           (when-let [s
                      (or
-                       (do                (enc/get-sys-val (get-in ids [action  :add :prop]) (get-in ids [action  :add :env])))
-                       (when incl-legacy? (enc/get-sys-val (get-in ids [:legacy :add :prop]) (get-in ids [:legacy :add :env]))))]
+                       (do                (enc/get-sys-val* (get-in ids [action  :add :prop]) (get-in ids [action  :add :env])))
+                       (when incl-legacy? (enc/get-sys-val* (get-in ids [:legacy :add :prop]) (get-in ids [:legacy :add :env]))))]
 
             (if (allow-and-record? s) s (split-class-names>set s)))]
 
@@ -547,8 +547,8 @@
   Upgrading from an older version of Nippy and unsure whether you've been
   using Nippy's Serializable support, or which classes to allow? See [2].
 
-  See also `taoensso.encore/compile-str-filter` for a util to help easily
-  build more advanced predicate functions.
+  See also `taoensso.encore/name-filter` for a util to help easily build
+  more advanced predicate functions.
 
   Thanks to Timo Mihaljov (@solita-timo-mihaljov) for an excellent report
   identifying this vulnerability.
@@ -649,7 +649,7 @@
         (fn [x]
           (if (allow-and-record? x)
             allow-and-record-any-serializable-class-unsafe
-            (enc/compile-str-filter x))))
+            (enc/name-filter x))))
 
       conform?* (fn [x cn] ((compile x) cn)) ; Uncached because input domain possibly infinite
       conform?
diff --git a/src/taoensso/nippy/utils.clj b/src/taoensso/nippy/utils.clj
index fb5e84ec..3b262afa 100644
--- a/src/taoensso/nippy/utils.clj
+++ b/src/taoensso/nippy/utils.clj
@@ -9,17 +9,17 @@
 ;; Unfortunately the only ~reliable way we can tell if something's
 ;; really serializable/readable is to actually try a full roundtrip.
 
-(let [swap-cache! enc/-swap-val!]
-  (defn- memoize-type-test [test-fn]
-    (let [cache (atom {})] ; {<type> <type-okay?>}
-      (fn [x]
-        (let [t (type x)
-              ;; This is a bit hackish, but no other obvious solutions (?):
-              cacheable? (not (re-find #"__\d+" (str t))) ; gensym form
-              test (fn [] (try (test-fn x) (catch Exception _ false)))]
-          (if cacheable?
-            @(swap-cache! cache t #(if % % (delay (test))))
-            (test)))))))
+(defn- memoize-type-test [test-fn]
+  (let [cache_ (enc/latom {})] ; {<type> <type-okay?>}
+    (fn [x]
+      (let [t          (type x)
+            gensym?    (re-find #"__\d+" (str t))
+            cacheable? (not gensym?) ; Hack, but no obviously better solutions
+            test       (fn [] (try (test-fn x) (catch Exception _ false)))]
+
+        (if cacheable?
+          @(cache_ t #(if % % (delay (test))))
+          (do                        (test)))))))
 
 (def     readable? (memoize-type-test (fn [x] (-> x enc/pr-edn enc/read-edn) true)))
 (def serializable?
@@ -53,7 +53,7 @@
     (serializable? "Hello world") ; Cacheable
     (readable?     (fn []))       ; Uncacheable
     (serializable? (fn []))       ; Uncacheable
-    )) ; [5.65 5.88 1129.46 1.4]
+    )) ; [2.52 2.53 521.34 0.63]
 
 ;;;;