diff --git a/CHANGELOG.md b/CHANGELOG.md
index 77e7920b2..fd779fa70 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -5,6 +5,10 @@
 1. [#302](https://github.com/influxdata/influxdb-client-js/pull/302): Expose response headers in all APIs.
 1. [#302](https://github.com/influxdata/influxdb-client-js/pull/302): Add `tokens.js` example.
 
+### Bug Fixes
+
+1. [#305](https://github.com/influxdata/influxdb-client-js/pull/305): Remove deprecated zlib constants.
+
 ## 1.10.0 [2021-01-29]
 
 ### Features
diff --git a/packages/core/src/impl/node/NodeHttpTransport.ts b/packages/core/src/impl/node/NodeHttpTransport.ts
index 595d691fa..4fa92174f 100644
--- a/packages/core/src/impl/node/NodeHttpTransport.ts
+++ b/packages/core/src/impl/node/NodeHttpTransport.ts
@@ -19,8 +19,8 @@ import {CLIENT_LIB_VERSION} from '../version'
 import Logger from '../Logger'
 
 const zlibOptions = {
-  flush: zlib.Z_SYNC_FLUSH,
-  finishFlush: zlib.Z_SYNC_FLUSH,
+  flush: zlib.constants.Z_SYNC_FLUSH,
+  finishFlush: zlib.constants.Z_SYNC_FLUSH,
 }
 const emptyBuffer = Buffer.allocUnsafe(0)