How to Fix Version Mismatch in Perl

Version Mismatch in Perl

Perl version mismatches occur when modules require features from newer Perl versions, or when XS modules are compiled against a different Perl installation.

Common Causes

• System Perl version too old for required modules
• use v5.36 features not available on older Perl
• XS modules compiled for different Perl ABI

Resolution

Manage Perl versions explicitly:

# Specify minimum Perl version
use v5.36;  # Enables strict, warnings, signatures

# Check at runtime if needed
BEGIN {
    if ($] < 5.036) {
        die "This application requires Perl 5.36 or newer.\n"
          . "Current version: $]\n"
          . "Install with: perlbrew install perl-5.38.0\n";
    }
}

# cpanfile - pin module versions
requires 'Mojolicious', '== 9.35';
requires 'DBI', '>= 1.643';
requires 'JSON::XS', '>= 4.03';

# Use perlbrew for version management
perlbrew install perl-5.38.0
perlbrew switch perl-5.38.0
cpanm --installdeps .

Use perlbrew to manage Perl versions and install modules into the correct Perl installation.

Prevention Tips

To avoid this issue recurring, add automated checks to your CI/CD pipeline. Write integration tests that exercise the failure path — not just the happy path. Use linting rules to enforce best practices across your team. Consider adding health checks that detect this class of error early in staging before it reaches production.

Bugsly for Perl

Bugsly captures Perl version and module loading errors with @INC paths, helping you diagnose whether the wrong Perl installation or module version was loaded.