diff --git a/source/dub/dub.d b/source/dub/dub.d
index 04739a8..2ebc60a 100644
--- a/source/dub/dub.d
+++ b/source/dub/dub.d
@@ -59,7 +59,7 @@
 deprecated("use defaultRegistryURLs") enum defaultRegistryURL = defaultRegistryURLs[0];
 
 /// The URL to the official package registry and it's default fallback registries.
-enum defaultRegistryURLs = [
+static immutable string[] defaultRegistryURLs = [
 	"https://code.dlang.org/",
 	"https://code-mirror.dlang.io/",
 	"https://dub-registry.herokuapp.com/",
diff --git a/source/dub/generators/sublimetext.d b/source/dub/generators/sublimetext.d
index 9ac53c9..1bf2187 100644
--- a/source/dub/generators/sublimetext.d
+++ b/source/dub/generators/sublimetext.d
@@ -67,7 +67,7 @@
 
 private Json buildSystems(BuildPlatform buildPlatform, string workingDiretory = getcwd())
 {
-	enum BUILD_TYPES = [
+	static immutable BUILD_TYPES = [
 		//"plain",
 		"debug",
 		"release",
diff --git a/source/dub/internal/vibecompat/data/utils.d b/source/dub/internal/vibecompat/data/utils.d
index a967455..ace6a76 100644
--- a/source/dub/internal/vibecompat/data/utils.d
+++ b/source/dub/internal/vibecompat/data/utils.d
@@ -215,8 +215,8 @@
 		ref int someTempl()() { return i; }
 	}
 
-	enum plainFields = ["i"];
-	enum fields = ["i", "p1", "p4", "p5"];
+	immutable plainFields = ["i"];
+	immutable fields = ["i", "p1", "p4", "p5"];
 
 	foreach (mem; __traits(allMembers, S)) {
 		static if (isRWField!(S, mem)) static assert(fields.canFind(mem), mem~" detected as field.");