You can specify exact versions of packages in your requirements.txt file by using the == operator. For example, if you wanted to install version 2.0.3 of a package, you would write the following in your requirements.txt file:

package_name==2.0.3

If you wanted to install a version that is at least 2.0.3, you would use the >= operator. For example:

package_name>=2.0.3
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