[FLINK-17365] Update Dockerfiles for 1.9.3 release
diff --git a/1.9/scala_2.11-debian/Dockerfile b/1.9/scala_2.11-debian/Dockerfile
index d077523..49046f8 100644
--- a/1.9/scala_2.11-debian/Dockerfile
+++ b/1.9/scala_2.11-debian/Dockerfile
@@ -44,9 +44,9 @@
   gosu nobody true
 
 # Configure Flink version
-ENV FLINK_VERSION=1.9.2 \
+ENV FLINK_VERSION=1.9.3 \
     SCALA_VERSION=2.11 \
-    GPG_KEY=EF88474C564C7A608A822EEC3FF96A2057B6476C
+    GPG_KEY=6B6291A8502BA8F0913AE04DDEB95B05BF075300
 
 # Prepare environment
 ENV FLINK_HOME=/opt/flink
diff --git a/1.9/scala_2.12-debian/Dockerfile b/1.9/scala_2.12-debian/Dockerfile
index ed8ec7c..aad8384 100644
--- a/1.9/scala_2.12-debian/Dockerfile
+++ b/1.9/scala_2.12-debian/Dockerfile
@@ -44,9 +44,9 @@
   gosu nobody true
 
 # Configure Flink version
-ENV FLINK_VERSION=1.9.2 \
+ENV FLINK_VERSION=1.9.3 \
     SCALA_VERSION=2.12 \
-    GPG_KEY=EF88474C564C7A608A822EEC3FF96A2057B6476C
+    GPG_KEY=6B6291A8502BA8F0913AE04DDEB95B05BF075300
 
 # Prepare environment
 ENV FLINK_HOME=/opt/flink