diff --git a/CHANGELOG.md b/CHANGELOG.md
index ac74771..b87bd5c 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -9,6 +9,7 @@ Nothing to be released.
 ## [5.2.0] - 2023-04-30
 
 Add Hash ULID generator methods. #25
+
 Add a MIN and MAX constants and methods. #26
 
 ## [5.1.0] - 2022-10-22
diff --git a/README.md b/README.md
index 0f72c57..967ea53 100644
--- a/README.md
+++ b/README.md
@@ -19,7 +19,7 @@ The jar file can be downloaded directly from [maven.org](https://repo1.maven.org
 
 Read the [Javadocs](https://javadoc.io/doc/com.github.f4b6a3/ulid-creator).
 
-How to Use
+Usage
 ------------------------------------------------------
 
 Create a ULID:
@@ -34,7 +34,7 @@ Create a Monotonic ULID:
 Ulid ulid = UlidCreator.getMonotonicUlid();
 ```
 
-### Maven dependency
+### Dependency
 
 Add these lines to your `pom.xml`.
 
diff --git a/src/main/java/com/github/f4b6a3/ulid/Ulid.java b/src/main/java/com/github/f4b6a3/ulid/Ulid.java
index 740b6d3..2377ffd 100644
--- a/src/main/java/com/github/f4b6a3/ulid/Ulid.java
+++ b/src/main/java/com/github/f4b6a3/ulid/Ulid.java
@@ -89,9 +89,9 @@ public final class Ulid implements Serializable, Comparable<Ulid> {
 	 */
 	public static final Ulid MAX = new Ulid(0xffffffffffffffffL, 0xffffffffffffffffL);
 
-	protected static final byte[] ALPHABET_VALUES = new byte[256];
-	private static final char[] ALPHABET_UPPERCASE = "0123456789ABCDEFGHJKMNPQRSTVWXYZ".toCharArray();
-	private static final char[] ALPHABET_LOWERCASE = "0123456789abcdefghjkmnpqrstvwxyz".toCharArray();
+	static final byte[] ALPHABET_VALUES = new byte[256];
+	static final char[] ALPHABET_UPPERCASE = "0123456789ABCDEFGHJKMNPQRSTVWXYZ".toCharArray();
+	static final char[] ALPHABET_LOWERCASE = "0123456789abcdefghjkmnpqrstvwxyz".toCharArray();
 
 	static {