diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 028dfeb..dec37dd 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        java: ['8', '17']
+        java: ['8', '17', '21']
     steps:
       - uses: actions/checkout@v4
 
@@ -41,4 +41,4 @@ jobs:
           cli: 'latest'
 
       - name: Run Tests
-        run: clojure -T:build run-tests
+        run: bin/test
diff --git a/.gitignore b/.gitignore
index 89267ec..c6c83ae 100644
--- a/.gitignore
+++ b/.gitignore
@@ -8,3 +8,4 @@
 foo.clj
 .env
 .clj-kondo/.cache
+tags.lock
diff --git a/CHANGELOG.md b/CHANGELOG.md
index ce2a27f..c8b5561 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,13 @@ endeavour to be non-breaking (by moving to new names rather than by
 breaking existing names). COMMITS is an ever-increasing counter of
 commits since the beginning of this repository.
 
+## [6.33.204]
+
+- Update Sentry Java SDK to 6.33.0
+- Replace deprecated Sean Corfield build library with official Clojure tools.build
+- Add Java 21 as a testing target on GitHub Actions
+- Preserve keyword namespaces in java-util-hashmappify. Thanks @DerGuteMoritz!
+
 ## [6.29.202]
 
 - Update Sentry Java SDK to 6.29.0
@@ -371,7 +378,8 @@ commits since the beginning of this repository.
   compatible with Sentry 10.0.1 and below. If you wish to use those
   versions, please continue to use sentry-clj 1.7.30.
 
-[Unreleased]: https://github.com/getsentry/sentry-clj/compare/6.29.202...HEAD
+[Unreleased]: https://github.com/getsentry/sentry-clj/compare/6.33.204...HEAD
+[6.33.204]: https://github.com/getsentry/sentry-clj/compare/6.29.202...6.33.204
 [6.29.202]: https://github.com/getsentry/sentry-clj/compare/6.28.200...6.29.202
 [6.28.200]: https://github.com/getsentry/sentry-clj/compare/6.26.199...6.28.200
 [6.26.199]: https://github.com/getsentry/sentry-clj/compare/6.24.198...6.26.199
diff --git a/deps.edn b/deps.edn
index 9907126..3755c57 100644
--- a/deps.edn
+++ b/deps.edn
@@ -4,23 +4,24 @@
         ;;
         ;;
         ;;
-        io.sentry/sentry {:mvn/version "6.29.0"}
+        io.sentry/sentry {:mvn/version "6.33.0"}
         ring/ring-core {:mvn/version "1.10.0"}}
 
- :aliases {:build {:deps {io.github.seancorfield/build-clj {:git/tag "v0.9.2"
-                                                            :git/sha "9c9f078"}}
+ :aliases {:build {:extra-deps {io.github.clojure/tools.build {:mvn/version "0.9.6"}
+                                slipset/deps-deploy {:mvn/version "0.2.2"}}
                    :ns-default scripts.build}
 
            :test {:extra-paths ["test"]
-                  :extra-deps {cheshire/cheshire {:mvn/version "5.11.0"}
-                               com.github.seancorfield/expectations {:mvn/version "2.0.165"}
-                               lambdaisland/kaocha {:mvn/version "1.86.1355"}
+                  :extra-deps {cheshire/cheshire {:mvn/version "5.12.0"}
+                               com.github.seancorfield/expectations {:mvn/version "2.1.188"}
+                               lambdaisland/kaocha {:mvn/version "1.87.1366"}
                                lambdaisland/kaocha-junit-xml {:mvn/version "1.17.101"}
                                orchestra/orchestra {:mvn/version "2021.01.01-1"}
                                org.clojure/test.check {:mvn/version "1.1.1"}}}
 
-           :antq {:replace-deps {com.github.liquidz/antq {:mvn/version "2.6.1121"}
+           :antq {:replace-deps {com.github.liquidz/antq {:mvn/version "2.7.1133"}
                                  org.slf4j/slf4j-nop {:mvn/version "2.0.9"}}
+                  :replace-paths ["."]
                   :exec-fn antq.tool/outdated
                   :exec-args {:skip ["pom"]
                               :verbose true
diff --git a/examples/basic/deps.edn b/examples/basic/deps.edn
index 7c3b74c..ef169af 100644
--- a/examples/basic/deps.edn
+++ b/examples/basic/deps.edn
@@ -5,7 +5,7 @@
         ;;
         ;;
         ch.qos.logback/logback-classic {:mvn/version "1.4.11"}
-        io.sentry/sentry {:mvn/version "6.29.0"}
+        io.sentry/sentry {:mvn/version "6.33.0"}
         io.sentry/sentry-clj {:local/root "../../../sentry-clj"}
         org.clojure/tools.cli {:mvn/version "1.0.219"}
         org.clojure/tools.logging {:mvn/version "1.2.4"}
diff --git a/examples/ring_with_tracing/deps.edn b/examples/ring_with_tracing/deps.edn
index 5adeb85..277c307 100644
--- a/examples/ring_with_tracing/deps.edn
+++ b/examples/ring_with_tracing/deps.edn
@@ -7,7 +7,7 @@
         ch.qos.logback/logback-classic {:mvn/version "1.4.11"}
         integrant/integrant {:mvn/version "0.8.1"}
         integrant/repl {:mvn/version "0.3.3"}
-        io.sentry/sentry {:mvn/version "6.29.0"}
+        io.sentry/sentry {:mvn/version "6.33.0"}
         io.sentry/sentry-clj {:local/root "../../../sentry-clj"}
         org.clojure/tools.cli {:mvn/version "1.0.219"}
         org.clojure/tools.logging {:mvn/version "1.2.4"}
diff --git a/examples/uncaught/deps.edn b/examples/uncaught/deps.edn
index 7c3b74c..ef169af 100644
--- a/examples/uncaught/deps.edn
+++ b/examples/uncaught/deps.edn
@@ -5,7 +5,7 @@
         ;;
         ;;
         ch.qos.logback/logback-classic {:mvn/version "1.4.11"}
-        io.sentry/sentry {:mvn/version "6.29.0"}
+        io.sentry/sentry {:mvn/version "6.33.0"}
         io.sentry/sentry-clj {:local/root "../../../sentry-clj"}
         org.clojure/tools.cli {:mvn/version "1.0.219"}
         org.clojure/tools.logging {:mvn/version "1.2.4"}
diff --git a/pom.xml b/pom.xml
deleted file mode 100644
index f5be7de..0000000
--- a/pom.xml
+++ /dev/null
@@ -1,39 +0,0 @@
-<?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
-  <modelVersion>4.0.0</modelVersion>
-  <packaging>jar</packaging>
-  <groupId>io.sentry</groupId>
-  <artifactId>sentry-clj</artifactId>
-  <version>0.0.0</version>
-  <name>sentry-clj</name>
-  <description>A very thin wrapper around the official Java library for Sentry.</description>
-  <url>https://github.com/getsentry/sentry-clj</url>
-  <licenses>
-    <license>
-      <name>Eclipse Public License</name>
-      <url>http://www.eclipse.org/legal/epl-v10.html</url>
-    </license>
-  </licenses>
-  <scm>
-    <url>https://github.com/getsentry/sentry-clj</url>
-    <connection>scm:git:git://github.com/getsentry/sentry-clj.git</connection>
-    <developerConnection>scm:git:ssh://git@github.com/getsentry/sentry-clj.git</developerConnection>
-    <tag>0.0.0</tag>
-  </scm>
-  <build>
-    <sourceDirectory>src</sourceDirectory>
-  </build>
-  <repositories>
-    <repository>
-      <id>clojars</id>
-      <url>https://repo.clojars.org/</url>
-    </repository>
-  </repositories>
-  <distributionManagement>
-    <repository>
-      <id>clojars</id>
-      <name>Clojars repository</name>
-      <url>https://clojars.org/repo</url>
-    </repository>
-  </distributionManagement>
-</project>
diff --git a/scripts/build.clj b/scripts/build.clj
index d4182b7..45ffbf5 100644
--- a/scripts/build.clj
+++ b/scripts/build.clj
@@ -1,55 +1,70 @@
 (ns scripts.build
   (:require
    [clojure.tools.build.api :as b]
-   [org.corfield.build :as bb]))
+   [deps-deploy.deps-deploy :as dd]))
 
-(def ^:private version (format "6.29.%s" (b/git-count-revs nil)))
 (def ^:private library 'io.sentry/sentry-clj)
 
-(defn run-tests
-  "Tests the application.
+(defn ^:private the-version
+  [patch]
+  (format "6.33.%s" patch))
 
-   This task will compile and test the application.
-   "
-  [opts]
-  (-> (merge {:main-args ["-m" "kaocha.runner"]} opts)
-      (bb/run-tests)))
+(defn ^:private pom-template
+  [tag]
+  [[:description "A very thin wrapper around the official Java library for Sentry."]
+   [:url "https://github.com/getsentry/sentry-clj"]
+   [:licenses
+    [:license
+     [:name "Eclipse Public License"]
+     [:url "http://www.eclipse.org/legal/epl-v10.html"]]]
+   [:scm
+    [:url "https://github.com/getsentry/sentry-clj"]
+    [:connection "scm:git:git://github.com/getsentry/sentry-clj.git"]
+    [:developerConnection "scm:git:ssh://git@github.com/getsentry/sentry-clj.git"]
+    [:tag tag]]])
 
-(defn jar
-  "JAR the artifact.
-
-   This task will create the JAR in the `target` directory.
-   "
-  [{:keys [tag] :or {tag version} :as opts}]
-  (-> opts
-      (assoc :lib library :version tag :tag tag)
-      (bb/clean)
-      (bb/jar)))
-
-(defn deploy
-  "Deploy the JAR to your local repository (proxy).
-
-   This task will build and deploy the JAR to your
-   local repository using `deps-deploy`. This requires
-   the following environment variables being set beforehand:
+(def ^:private revs (Integer/parseInt (b/git-count-revs nil)))
+(def ^:private snapshot (the-version (format "%s-SNAPSHOT" (inc revs))))
+(def ^:private class-dir "target/classes")
+(def ^:private target "target")
 
-   CLOJARS_URL, CLOJARS_USERNAME, CLOJARS_PASSWORD
+(defn ^:private jar-opts
+  [{:keys [version] :as opts}]
+  (assoc opts
+         :lib library
+         :version version
+         :jar-file (format "target/%s-%s.jar" library version)
+         :basis (b/create-basis)
+         :class-dir class-dir
+         :target target
+         :src-dirs ["src"]
+         :pom-data (pom-template version)))
 
-   Even although they are CLOJARS environment variables, they
-   can actually point to anywhere, like your own Nexus OSS repository
-   or an Artifactory repository for example.
-
-   You may want to consider something like `direnv` to manage your
-   per-directory loading of environment variables.
-   "
-  [{:keys [tag] :or {tag version} :as opts}]
-  (-> opts
-      (assoc :lib library :version tag :tag tag)
-      (bb/deploy)))
+(defn jar
+  "This task will create the JAR in the `target` directory."
+  [{:keys [tag] :or {tag snapshot} :as opts}]
+  (let [{:keys [jar-file] :as opts'} (jar-opts (assoc opts :version tag))]
+    (println (format "Cleaning '%s'..." target))
+    (b/delete {:path "target"})
+    (println (format "Writing 'pom.xml'..."))
+    (b/write-pom opts')
+    (println (format "Copying source files to '%s'..." class-dir))
+    (b/copy-dir {:src-dirs ["src" "resources"] :target-dir class-dir})
+    (println (format "Building JAR to '%s'..." jar-file))
+    (b/jar opts')
+    (println "Finished."))
+  opts)
 
 (defn install
-  "Deploy the JAR to your local .m2 directory"
-  [{:keys [tag] :or {tag version} :as opts}]
-  (-> opts
-      (assoc :lib library :version tag :tag tag)
-      (bb/install)))
+  [{:keys [tag] :or {tag snapshot} :as opts}]
+  (let [{:keys [jar-file] :as opts'} (jar-opts (assoc opts :version tag))]
+    (dd/deploy {:installer :local
+                :artifact (b/resolve-path jar-file)
+                :pom-file (b/pom-path (select-keys opts' [:lib :class-dir]))})))
+
+(defn publish
+  [{:keys [tag] :or {tag snapshot} :as opts}]
+  (let [{:keys [jar-file] :as opts'} (jar-opts (assoc opts :version tag))]
+    (dd/deploy {:installer :remote
+                :artifact (b/resolve-path jar-file)
+                :pom-file (b/pom-path (select-keys opts' [:lib :class-dir]))})))