diff --git a/Project.toml b/Project.toml
index 617e023..6de4ec8 100644
--- a/Project.toml
+++ b/Project.toml
@@ -11,7 +11,6 @@ BufferedStreams = "e1450e63-4bb3-523b-b2a4-4ffa8c0fd77d"
 Dates = "ade2ca70-3891-5945-98fb-dc099432e06a"
 EnumX = "4e289a0a-7415-4d19-859d-a7e5c4648b56"
 TOML = "fa267f1f-6049-4f14-aa54-33bafae1ed76"
-TranscodingStreams = "3bb67fe8-82b1-5028-8e26-92a6c54297fa"
 
 [compat]
 Aqua = "0.8"
@@ -19,7 +18,6 @@ BufferedStreams = "1.2"
 Dates = "1"
 EnumX = "1"
 JET = "0.4, 0.5, 0.6, 0.7, 0.8"
-TranscodingStreams = "0.9, 0.10"
 TOML = "1"
 Test = "1"
 julia = "1.6"
diff --git a/src/ProtoBuf.jl b/src/ProtoBuf.jl
index bab4f48..8144f66 100644
--- a/src/ProtoBuf.jl
+++ b/src/ProtoBuf.jl
@@ -1,6 +1,5 @@
 module ProtoBuf
 import EnumX
-import TranscodingStreams
 import BufferedStreams
 using TOML
 
diff --git a/src/codec/Codecs.jl b/src/codec/Codecs.jl
index 0a11317..e4c01af 100644
--- a/src/codec/Codecs.jl
+++ b/src/codec/Codecs.jl
@@ -1,7 +1,6 @@
 module Codecs
 
 using BufferedStreams: BufferedOutputStream, BufferedInputStream
-using TranscodingStreams: TranscodingStream
 
 @enum(WireType::UInt32, VARINT=0, FIXED64=1, LENGTH_DELIMITED=2, START_GROUP=3, END_GROUP=4, FIXED32=5)
 
diff --git a/src/codec/vbyte.jl b/src/codec/vbyte.jl
index 6a505fe..549adbb 100644
--- a/src/codec/vbyte.jl
+++ b/src/codec/vbyte.jl
@@ -1,5 +1,5 @@
 # https://discourse.julialang.org/t/allocation-due-to-noinline-for-unsafe-read-and-unsafe-write-in-io-jl/69421
-@inline function _unsafe_write(io::S, ref::Ref{T}, nb::Integer) where {T,S<:Union{TranscodingStream,BufferedOutputStream,BufferedInputStream}}
+@inline function _unsafe_write(io::S, ref::Ref{T}, nb::Integer) where {T,S<:Union{BufferedOutputStream,BufferedInputStream}}
     GC.@preserve ref unsafe_write(io, Base.unsafe_convert(Ref{T}, ref)::Ptr, nb)
 end
 @noinline _reached_maxsize_error(io::IOBuffer, nb) = throw(ArgumentError("Cannot write $nb bytes to IOBuffer at position $(position(io)) with maxsize $(io.maxsize)"))
diff --git a/src/lexing/Lexers.jl b/src/lexing/Lexers.jl
index 1033578..49767e1 100644
--- a/src/lexing/Lexers.jl
+++ b/src/lexing/Lexers.jl
@@ -1,7 +1,6 @@
 module Lexers
 
 import ..Tokens
-import ..TranscodingStreams
 
 const EOF_CHAR = typemax(Char)
 
@@ -45,7 +44,6 @@ end
 
 filepath(l::Lexer) = l.filepath
 filepath(io::IOStream) = abspath(io.name[7:end-1])
-filepath(io::TranscodingStreams.TranscodingStream) = filepath(io.stream)
 filepath(io::IO) = ""
 # TODO: print nicer, clickable token locations with this function, esp for errors.
 # How to get the Lexers' IO to the tokens' show method?
diff --git a/test/test_protojl.jl b/test/test_protojl.jl
index ace6381..0eaa284 100644
--- a/test/test_protojl.jl
+++ b/test/test_protojl.jl
@@ -106,7 +106,6 @@ end
 module TestComplexMessage
 using Test
 using ProtoBuf
-using TranscodingStreams
 using BufferedStreams
 
 function roundtrip_iobuffer(input, f_in=identity, f_out=identity)