diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
index ccebba7..033e24c 100644
--- a/gradle/wrapper/gradle-wrapper.jar
+++ b/gradle/wrapper/gradle-wrapper.jar
Binary files differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index bdc9a83..9f4197d 100644
--- a/gradle/wrapper/gradle-wrapper.properties
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -1,6 +1,7 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-8.0.2-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.2.1-bin.zip
 networkTimeout=10000
+validateDistributionUrl=true
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
diff --git a/gradlew b/gradlew
index 79a61d4..fcb6fca 100755
--- a/gradlew
+++ b/gradlew
@@ -85,9 +85,6 @@
 APP_BASE_NAME=${0##*/}
 APP_HOME=$( cd "${APP_HOME:-./}" && pwd -P ) || exit
 
-# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
-DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
-
 # Use the maximum available, or set MAX_FD != -1 to use that value.
 MAX_FD=maximum
 
@@ -133,10 +130,13 @@
     fi
 else
     JAVACMD=java
-    which java >/dev/null 2>&1 || die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
 
 Please set the JAVA_HOME variable in your environment to match the
 location of your Java installation."
+    fi
 fi
 
 # Increase the maximum file descriptors if we can.
@@ -197,6 +197,10 @@
     done
 fi
 
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
 # Collect all arguments for the java command;
 #   * $DEFAULT_JVM_OPTS, $JAVA_OPTS, and $GRADLE_OPTS can contain fragments of
 #     shell script including quotes and variable substitutions, so put them in
diff --git a/src/main/java/com/github/tonivade/vavr/effect/IO.java b/src/main/java/com/github/tonivade/vavr/effect/IO.java
index 42d9f98..64f59e1 100644
--- a/src/main/java/com/github/tonivade/vavr/effect/IO.java
+++ b/src/main/java/com/github/tonivade/vavr/effect/IO.java
@@ -5,6 +5,7 @@
 package com.github.tonivade.vavr.effect;
 
 import static io.vavr.Function1.identity;
+
 import java.time.Duration;
 import java.util.ArrayDeque;
 import java.util.Deque;
@@ -22,6 +23,7 @@
 import java.util.function.Predicate;
 import java.util.function.Supplier;
 import java.util.function.UnaryOperator;
+
 import io.vavr.CheckedConsumer;
 import io.vavr.CheckedFunction0;
 import io.vavr.CheckedRunnable;
diff --git a/src/main/java/com/github/tonivade/vavr/effect/Resource.java b/src/main/java/com/github/tonivade/vavr/effect/Resource.java
index 78d1027..0c81b47 100644
--- a/src/main/java/com/github/tonivade/vavr/effect/Resource.java
+++ b/src/main/java/com/github/tonivade/vavr/effect/Resource.java
@@ -5,6 +5,7 @@
 package com.github.tonivade.vavr.effect;
 
 import java.util.Objects;
+
 import io.vavr.CheckedConsumer;
 import io.vavr.Function1;
 import io.vavr.Tuple;
@@ -22,7 +23,7 @@
     return flatMap(t -> pure(mapper.andThen(IO::<R>pure).apply(t)));
   }
   
-  public <R> Resource<R> flatMap(Function1<? super T, ? extends Resource<? extends R>> mapper) {
+  public <R> Resource<R> flatMap(Function1<? super T, Resource<? extends R>> mapper) {
     return new Resource<>(managed.flatMap(
         t -> {
           Resource<? extends R> apply = mapper.apply(t._1());