Ctranslate2 installation error

Hello,
When I try to install ctranslate2 on a virtual environment, I get this following error:
What am I missing?

ERROR: Could not find a version that satisfies the requirement ctranslate2 (from versions: none)
ERROR: No matching distribution found for ctranslate2
Here is a screenshot:

Hi,

What system are you using? CTranslate2 pre-built packages are only available for Linux x86-64.

Hi,
It is: Linux pastis 3.2.83-grsec #1 SMP Sun Oct 23 18:56:27 UTC 2016 i686 GNU/Linux

Sorry, we don’t support 32-bit systems.

I was using docker
Base image docker.elastic.co/elasticsearch/elasticsearch:6.3.1

I needed to install ctranslate2==1.19.0.
I upgraded pip3 in the dockerfile (RUN pip3 install --upgrade pip), It solved my issue of :
ERROR: Could not find a version that satisfies the requirement ctranslate2 (from versions: none)
ERROR: No matching distribution found for ctranslate2```