julia> using TimeZones # 1.5.1

julia> tz"UTC"
ERROR: LoadError: Cannot read stream serialized with a newer version of Julia.
Got data version 12 > current version 10
Stacktrace:
 [1] error(::String) at ./error.jl:33
 [2] readheader(::Serialization.Serializer{IOStream}) at /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.5/Serialization/src/Serialization.jl:715
 [3] handle_deserialize(::Serialization.Serializer{IOStream}, ::Int32) at /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.5/Serialization/src/Serialization.jl:878
 [4] deserialize(::Serialization.Serializer{IOStream}) at /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.5/Serialization/src/Serialization.jl:773
 [5] deserialize at /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.5/Serialization/src/Serialization.jl:760 [inlined]
 [6] open(::typeof(Serialization.deserialize), ::String, ::Vararg{String,N} where N; kwargs::Base.Iterators.Pairs{Union{},Union{},Tuple{},NamedTuple{(),Tuple{}}}) at ./io.jl:325
 [7] open at ./io.jl:323 [inlined]
 [8] (::TimeZones.var"#3#4"{String})() at /Users/kristoffercarlsson/.julia/packages/TimeZones/v0mfN/src/types/timezone.jl:50
 [9] get!(::TimeZones.var"#3#4"{String}, ::Dict{String,Tuple{TimeZone,TimeZones.Class}}, ::String) at ./dict.jl:450
 [10] TimeZone(::String, ::TimeZones.Class) at /Users/kristoffercarlsson/.julia/packages/TimeZones/v0mfN/src/types/timezone.jl:46 (repeats 2 times)
 [11] @tz_str(::LineNumberNode, ::Module, ::Any) at /Users/kristoffercarlsson/.julia/packages/TimeZones/v0mfN/src/types/timezone.jl:86
in expression starting at REPL[2]:1