diff --git a/ChangeLog b/ChangeLog
index 8a96b56..544a370 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,6 @@
+Version 0.4.5
+-------------
+    * fix `java_test` using f-string to test package arg
 Version 0.4.4
 -------------
     * `java_runtime_image` provides an entry point so it can be referenced directly
diff --git a/VERSION b/VERSION
index 6f2743d..0bfccb0 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-0.4.4
+0.4.5
diff --git a/build_defs/java.build_defs b/build_defs/java.build_defs
index b91cf62..fafdeec 100644
--- a/build_defs/java.build_defs
+++ b/build_defs/java.build_defs
@@ -374,7 +374,7 @@ def java_test(name:str, srcs:list, resources:list=None, resources_root:str=None,
     else:
         java = CONFIG.JAVA.JAVA_TOOL
 
-    test_package_arg = "-Dbuild.please.testpackage={test_package}" if test_package is not None else ""
+    test_package_arg = f"-Dbuild.please.testpackage={test_package}" if test_package is not None else ""
 
     cmd = 'ln -s "$(if [ -f "$TOOLS_JUNIT" ]; then echo "$TOOLS_JUNIT"; else echo "$(which "$TOOLS_JUNIT")"; fi)" . && ' + cmd
     test_cmd = f"$TOOLS_JAVA {test_package_arg} {jvm_args} -jar $(location :{name}) {flags}"