diff --git a/algorithm-exercises-java/build.gradle b/algorithm-exercises-java/build.gradle
index e868dd1..75b2eb9 100644
--- a/algorithm-exercises-java/build.gradle
+++ b/algorithm-exercises-java/build.gradle
@@ -48,7 +48,7 @@ tasks.named('test') {
 }
 
 checkstyle {
-    toolVersion = '10.23.1'
+    toolVersion = '10.25.0'
     configFile = file("${rootDir}/checkstyle.xml")
     maxErrors	= 0
     maxWarnings	= 0
diff --git a/algorithm-exercises-java/src/main/java/ae/hackerrank/projecteuler/Euler001.java b/algorithm-exercises-java/src/main/java/ae/hackerrank/projecteuler/Euler001.java
index c520f41..becb44c 100644
--- a/algorithm-exercises-java/src/main/java/ae/hackerrank/projecteuler/Euler001.java
+++ b/algorithm-exercises-java/src/main/java/ae/hackerrank/projecteuler/Euler001.java
@@ -41,8 +41,8 @@ public static Long euler001(Integer a, Integer b, Integer n) {
     Long lcm = (a * b) / gcd(a, b);
 
     result = sumOfArithmeticProgression((long) n, (long) a)
-      + sumOfArithmeticProgression((long) n, (long) b)
-      - sumOfArithmeticProgression((long) n, lcm);
+        + sumOfArithmeticProgression((long) n, (long) b)
+        - sumOfArithmeticProgression((long) n, lcm);
 
     String log = String.format("Problem 001 solved: %d", result);
     Log.info(log);
diff --git a/algorithm-exercises-java/src/main/java/ae/projecteuler/Problem0021.java b/algorithm-exercises-java/src/main/java/ae/projecteuler/Problem0021.java
index 2a7624c..1ad5eaa 100644
--- a/algorithm-exercises-java/src/main/java/ae/projecteuler/Problem0021.java
+++ b/algorithm-exercises-java/src/main/java/ae/projecteuler/Problem0021.java
@@ -47,7 +47,7 @@ public static String problem0021(int start, int limit) {
 
       if (
           !key.equals(value)
-          && key.equals(properDivisorsSums.get(value))
+            && key.equals(properDivisorsSums.get(value))
       ) {
         amicableNumbers.add(key);
       }