diff --git a/pom.xml b/pom.xml
index 5a5267a..704507d 100644
--- a/pom.xml
+++ b/pom.xml
@@ -23,7 +23,7 @@
         <dependency>
             <groupId>org.junit.jupiter</groupId>
             <artifactId>junit-jupiter</artifactId>
-            <version>6.0.1</version>
+            <version>5.11.0</version>
             <scope>test</scope>
         </dependency>
     </dependencies>
diff --git a/shell.nix b/shell.nix
new file mode 100644
index 0000000..a9cc7b4
--- /dev/null
+++ b/shell.nix
@@ -0,0 +1,8 @@
+{ pkgs ? import <nixpkgs> {} }:
+
+let
+  jdk = pkgs.jdk25;
+in pkgs.mkShell {
+  buildInputs = [ jdk pkgs.maven ];
+  JAVA_HOME = "${jdk}";
+}