diff --git a/Dockerfile b/Dockerfile
index 168b374..c75b712 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,8 +1,5 @@
 FROM alpine:3.14
 
-ARG GRAALVERSION
-ARG SDKMAN
-
 COPY platform.sh ./platform.sh
 RUN ls -l
 RUN chmod +x ./platform.sh && ./platform.sh
@@ -10,9 +7,11 @@ RUN chmod +x ./platform.sh && ./platform.sh
 RUN apk update && apk upgrade && \
     apk add --no-cache curl ca-certificates bash tzdata fontconfig zip sed
 
+SHELL   ["/bin/bash", "-c"]
+
 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 && \
     sdk flush
 
 ENV LANG C.UTF-8