[hotfix] Update URL in ops playground README.md to Flink master docs.
diff --git a/operations-playground/README.md b/operations-playground/README.md
index 5287be7..9eb0387 100644
--- a/operations-playground/README.md
+++ b/operations-playground/README.md
@@ -47,4 +47,4 @@
## Further instructions
The playground setup and more detailed instructions are presented in the
-["Getting Started" guide](https://ci.apache.org/projects/flink/flink-docs-release-1.8/getting-started/docker-playgrounds/flink-operations-playground.html) of Flink's documentation.
+["Getting Started" guide](https://ci.apache.org/projects/flink/flink-docs-master/getting-started/docker-playgrounds/flink-operations-playground.html) of Flink's documentation.
