diff --git a/deps.edn b/deps.edn
index c05d160d..ac4c1ea1 100644
--- a/deps.edn
+++ b/deps.edn
@@ -171,7 +171,9 @@
                                                        :deps/manifest :deps}
                          net.cgrand/xforms {:git/url "https://github.com/cgrand/xforms"
                                             :git/sha "550dbc150a79c6ecc148d8a7e260e10bc36321c6"
-                                            :deps/manifest :deps}}
+                                            :deps/manifest :deps}
+                         prismatic/plumbing {:git/url "https://github.com/plumatic/plumbing",
+                                             :git/sha "424bc704f2db422de34269c139a5494314b3a43b"}}
             :classpath-overrides {org.clojure/clojure nil
                                   org.clojure/spec.alpha nil}}
            :clj-nvd
diff --git a/resources/META-INF/babashka/deps.edn b/resources/META-INF/babashka/deps.edn
index c05d160d..ac4c1ea1 100644
--- a/resources/META-INF/babashka/deps.edn
+++ b/resources/META-INF/babashka/deps.edn
@@ -171,7 +171,9 @@
                                                        :deps/manifest :deps}
                          net.cgrand/xforms {:git/url "https://github.com/cgrand/xforms"
                                             :git/sha "550dbc150a79c6ecc148d8a7e260e10bc36321c6"
-                                            :deps/manifest :deps}}
+                                            :deps/manifest :deps}
+                         prismatic/plumbing {:git/url "https://github.com/plumatic/plumbing",
+                                             :git/sha "424bc704f2db422de34269c139a5494314b3a43b"}}
             :classpath-overrides {org.clojure/clojure nil
                                   org.clojure/spec.alpha nil}}
            :clj-nvd
diff --git a/src/babashka/impl/classes.clj b/src/babashka/impl/classes.clj
index 5c2e808d..ce2867ab 100644
--- a/src/babashka/impl/classes.clj
+++ b/src/babashka/impl/classes.clj
@@ -502,6 +502,7 @@
           java.util.Base64$Encoder
           java.util.Date
           java.util.HashMap
+          java.util.HashSet
           java.util.IdentityHashMap
           java.util.InputMismatchException
           java.util.List
@@ -745,6 +746,8 @@
                          java.security.cert.X509Certificate
                          (instance? java.io.Console v)
                          java.io.Console
+                         (instance? java.util.Set v)
+                         java.util.Set
                          ;; keep commas for merge friendliness
                          )))
         m (assoc m (list 'quote 'clojure.lang.Var) 'sci.lang.Var)
diff --git a/test-resources/lib_tests/bb-tested-libs.edn b/test-resources/lib_tests/bb-tested-libs.edn
index 3dd050a2..f7ba6189 100644
--- a/test-resources/lib_tests/bb-tested-libs.edn
+++ b/test-resources/lib_tests/bb-tested-libs.edn
@@ -184,7 +184,11 @@
                               :git-url "https://github.com/clojure/tools.namespace",
                               :test-namespaces [clojure.tools.namespace.test-helpers clojure.tools.namespace.dependency-test clojure.tools.namespace.find-test clojure.tools.namespace.move-test clojure.tools.namespace.parse-test],
                               :test-paths ["src/test/clojure"]}
- net.cgrand/xforms {:git-url "https://github.com/cgrand/xforms", 
-                    :git-sha "550dbc150a79c6ecc148d8a7e260e10bc36321c6", 
-                    :test-namespaces [net.cgrand.xforms-test], 
-                    :test-paths ["test"]}}
+ net.cgrand/xforms {:git-url "https://github.com/cgrand/xforms",
+                    :git-sha "550dbc150a79c6ecc148d8a7e260e10bc36321c6",
+                    :test-namespaces [net.cgrand.xforms-test],
+                    :test-paths ["test"]}
+ prismatic/plumbing {:git-url "https://github.com/plumatic/plumbing",
+                     :git-sha "424bc704f2db422de34269c139a5494314b3a43b",
+                     :test-namespaces [plumbing.core-test],
+                     :test-paths ["test"]}}