# Hail JAR not the right version of Spark
**URL:** https://discuss.hail.is/t/hail-jar-not-the-right-version-of-spark/1392
**Category:** Hail Query & hailctl
**Created:** [April 30, 2020, 2:47pm UTC](https://discuss.hail.is/t/hail-jar-not-the-right-version-of-spark/1392 "2020-04-30T14:47:24Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@njbernstein](https://discuss.hail.is/u/njbernstein)
#### Post date: [April 30, 2020, 2:47pm UTC](https://discuss.hail.is/t/hail-jar-not-the-right-version-of-spark/1392/1 "2020-04-30T14:47:24Z")
Hi there,
I’m using `hail==0.2.38` on the cloud, and when I boot up hail I get the following warning:
```auto
2020-04-29 16:58:59 Hail: WARN: This Hail JAR was compiled for Spark 2.4.0, running with Spark 2.4.5.
Compatibility is not guaranteed.
```
Because `--image-version=1.4-debian9 ` has `2.4.5`.
Not sure if this was known already but thought I should point it out
---
### Author:  [@tpoterba](https://discuss.hail.is/u/tpoterba)
#### Post date: [April 30, 2020, 2:52pm UTC](https://discuss.hail.is/t/hail-jar-not-the-right-version-of-spark/1392/2 "2020-04-30T14:52:50Z")
Yeah, this is fine. We have this warning out of an abundance of caution since there could be internal API changes within patch versions, but our tests pass against 2.4.5 when building against 2.4.0.
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### Author:  [@njbernstein](https://discuss.hail.is/u/njbernstein)
#### Post date: [April 30, 2020, 5:21pm UTC](https://discuss.hail.is/t/hail-jar-not-the-right-version-of-spark/1392/3 "2020-04-30T17:21:54Z")
Cool. just checking