diff --git a/Dockerfile b/Dockerfile
index 5a50daa..e8800e9 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -61,14 +61,11 @@ LABEL   author                                  "Olivier Le Bris"
 LABEL   maintainer                              "tech@zogg.fr"
 LABEL   org.opencontainers.image.source         "https://zogg.fr"
 
-ENV     GRAALVERSION                            $GRAALVERSION
+ENV     GRAALVERSION                            20.0.2-graal
 ENV     LANG                                    C.UTF-8
-ENV     GRAALVM_YEAR_VERSION                    $GRAALVM_YEAR_VERSION
-ENV     GRAALVM_MAJOR_VERSION                   $GRAALVM_MAJOR_VERSION
-ENV     GRAALVM_MINOR_VERSION                   $GRAALVM_MINOR_VERSION
-ENV     JAVA_VERSION                            $JAVA_VERSION
-ENV     JAVA_HOME                               $JAVA_HOME
-ENV     PATH                                    $JAVA_HOME/bin:${PATH}
+ENV     JAVA_VERSION                            20
+ENV     JAVA_HOME                               /opt/graalvm
+ENV     PATH                                    /opt/graalvm/bin:${PATH}
 
 USER    root
 WORKDIR /
@@ -86,12 +83,12 @@ RUN             useradd -d /home/container -m container -s /bin/bash -p 'none' \
 
 # Install SDKMAN! and GraalVM specified version
 RUN             curl -s "https://get.sdkman.io" | bash \
-        &&      source "$SDKMAN/bin/sdkman-init.sh" \
-        &&      sdk install java $GRAALVERSION
+        &&      source "/root/.sdkman/bin/sdkman-init.sh" \
+        &&      sdk install java 20.0.2-graal
 
 # Copy GraalVM files to destination folder
 RUN             mkdir -p /opt/graalvm \
-        &&      cp -rf $SDKMAN/candidates/java/$GRAALVERSION/. /opt/graalvm/ \
+        &&      cp -rf /root/.sdkman/candidates/java/20.0.2-graal/. /opt/graalvm/ \
         &&      chown -R container:container /opt/graalvm
 
 # Setup GraalVM as default Java interpreter
@@ -108,10 +105,10 @@ RUN             mkdir -p /usr/java \
 # Uninstall SDKMAN! and do some cleanup
 USER    root
 WORKDIR /
-RUN             source "$SDKMAN/bin/sdkman-init.sh" \
-        &&      sdk uninstall java $GRAALVERSION --force \
+RUN             source "/root/.sdkman/bin/sdkman-init.sh" \
+        &&      sdk uninstall java 20.0.2-graal --force \
         &&      sdk flush \
-        &&      rm -rf $SDKMAN \
+        &&      rm -rf /root/.sdkman \
         &&      apt autoremove -y
 
 # Setup Pterodactyl necessary context