diff --git a/asciidoctorj-diagram/gradle.properties b/asciidoctorj-diagram/gradle.properties
index 95fbb35..94b8368 100644
--- a/asciidoctorj-diagram/gradle.properties
+++ b/asciidoctorj-diagram/gradle.properties
@@ -1,4 +1,4 @@
 properName=AsciidoctorJ Diagram
 description=AsciidoctorJ Diagram bundles the Asciidoctor Diagram RubyGem (asciidoctor-diagram) so it can be loaded into the JVM using JRuby.
-version=2.2.9
+version=2.2.10
 gem_name=asciidoctor-diagram
diff --git a/asciidoctorj-diagram/src/test/resources/sampleqrcode.adoc b/asciidoctorj-diagram/src/test/resources/sampleqrcode.adoc
index 0f3d52d..d39d3e3 100644
--- a/asciidoctorj-diagram/src/test/resources/sampleqrcode.adoc
+++ b/asciidoctorj-diagram/src/test/resources/sampleqrcode.adoc
@@ -2,7 +2,7 @@
 
 Scan this with your phone:
 
-[qrcode,testqrcode]
+[qrcode,testqrcode,png]
 ----
 https://my-link.tld/something
 ----
\ No newline at end of file
diff --git a/gradle.properties b/gradle.properties
index 806d2f7..0d8b538 100644
--- a/gradle.properties
+++ b/gradle.properties
@@ -1,2 +1,2 @@
-version=2.2.9
+version=2.2.10
 gem_name=asciidoctor-diagram
diff --git a/gradle/versioncheck.gradle b/gradle/versioncheck.gradle
index ccf26fd..5c85a3c 100644
--- a/gradle/versioncheck.gradle
+++ b/gradle/versioncheck.gradle
@@ -1,6 +1,6 @@
 buildscript {
     repositories {
-        jcenter()
+        mavenCentral()
     }
     dependencies {
         classpath 'com.github.zafarkhaja:java-semver:0.9.0'
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
index 943f0cb..033e24c 100644
Binary files a/gradle/wrapper/gradle-wrapper.jar and b/gradle/wrapper/gradle-wrapper.jar differ
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
index f398c33..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-7.6-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 65dcd68..fcb6fca 100755
--- a/gradlew
+++ b/gradlew
@@ -85,9 +85,6 @@ done
 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 @@ location of your Java installation."
     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.
@@ -144,7 +144,7 @@ if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
     case $MAX_FD in #(
       max*)
         # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
-        # shellcheck disable=SC3045 
+        # shellcheck disable=SC3045
         MAX_FD=$( ulimit -H -n ) ||
             warn "Could not query maximum file descriptor limit"
     esac
@@ -152,7 +152,7 @@ if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
       '' | soft) :;; #(
       *)
         # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
-        # shellcheck disable=SC3045 
+        # shellcheck disable=SC3045
         ulimit -n "$MAX_FD" ||
             warn "Could not set maximum file descriptor limit to $MAX_FD"
     esac
@@ -197,6 +197,10 @@ if "$cygwin" || "$msys" ; then
     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