diff --git a/Project.toml b/Project.toml
index ecea5bd..b4570e7 100644
--- a/Project.toml
+++ b/Project.toml
@@ -13,13 +13,13 @@ IterTools = "c8e1da08-722c-5040-9ed9-7db0dc04731e"
 JSON3 = "0f8b85d8-7281-11e9-16c2-39a750bddbf1"
 Logging = "56ddb016-857b-54e1-b83d-db4d58db5568"
 Malt = "36869731-bdee-424d-aa32-cab38c994e3b"
-PackageExtensionCompat = "65ce6f38-6b18-4e1d-a461-8949797d7930"
 Pkg = "44cfe95a-1eb2-52ea-b672-e2afdf69b78f"
 PrecompileTools = "aea7be01-6a6a-4083-8856-8a6e6704d82a"
 ProgressLogging = "33c8b6b6-d38a-422a-b730-caa89a2f386c"
 REPL = "3fa0cd96-eef1-5676-8a61-b3b8758bbffb"
 Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
 RelocatableFolders = "05181044-ff0b-4ac5-8273-598c1e38db00"
+Requires = "ae029012-a4dd-5104-9daa-d747884805df"
 SHA = "ea8e919c-243c-51af-8825-aaa63cd721ce"
 Scratch = "6c6a2e73-6563-6170-7368-637461726353"
 Sockets = "6462fe0b-24de-5631-8697-dd941f90decc"
@@ -36,7 +36,6 @@ IterTools = "1"
 JSON3 = "1"
 Logging = "1.6"
 Malt = "1"
-PackageExtensionCompat = "1"
 Pkg = "1.6"
 PrecompileTools = "1"
 ProgressLogging = "0.1.4"
diff --git a/src/QuartoNotebookWorker/Project.toml b/src/QuartoNotebookWorker/Project.toml
index cf0f4c4..a986bd7 100644
--- a/src/QuartoNotebookWorker/Project.toml
+++ b/src/QuartoNotebookWorker/Project.toml
@@ -12,32 +12,32 @@ Random = "9a3f8284-a2c9-5f02-9a11-845980a1fd5c"
 TOML = "fa267f1f-6049-4f14-aa54-33bafae1ed76"
 UUIDs = "cf7118a7-6976-5b1a-9a39-7adc72f591a4"
 
-[weakdeps]
-CairoMakie = "13f3f980-e62b-5c42-98c6-ff1f3baf88f0"
-DataFrames = "a93c6f00-e57d-5684-b7b6-d8193f3e46c0"
-JSON = "682c06a0-de6a-54ab-a142-c8b1cf79cde6"
-LaTeXStrings = "b964fa9f-0449-5b57-a5c2-d3ea65f4040f"
-Makie = "ee78f7c6-11fb-53f2-987a-cfe4a2b5a57a"
-PlotlyBase = "a03496cd-edff-5a9b-9e67-9cda94a718b5"
-PlotlyJS = "f0f68f2c-4968-5e81-91da-67840de0976a"
-Plots = "91a5bcdd-55d7-5caf-9e0b-520d859cae80"
-RCall = "6f49c342-dc21-5d91-9882-a32aef131414"
-Revise = "295af30f-e4ad-537b-8983-00126c2a3abe"
-SymPyCore = "458b697b-88f0-4a86-b56b-78b75cfb3531"
-Tables = "bd369af6-aec1-5ad0-b16a-f7cc5008161c"
-
-[extensions]
-QuartoNotebookWorkerCairoMakieExt = "CairoMakie"
-QuartoNotebookWorkerDataFramesTablesExt = ["DataFrames", "Tables"]
-QuartoNotebookWorkerJSONExt = "JSON"
-QuartoNotebookWorkerLaTeXStringsExt = "LaTeXStrings"
-QuartoNotebookWorkerMakieExt = "Makie"
-QuartoNotebookWorkerPlotlyBaseExt = "PlotlyBase"
-QuartoNotebookWorkerPlotlyJSExt = "PlotlyJS"
-QuartoNotebookWorkerPlotsExt = "Plots"
-QuartoNotebookWorkerRCallExt = "RCall"
-QuartoNotebookWorkerReviseExt = "Revise"
-QuartoNotebookWorkerSymPyCoreExt = "SymPyCore"
-
+# [weakdeps]
+# CairoMakie = "13f3f980-e62b-5c42-98c6-ff1f3baf88f0"
+# DataFrames = "a93c6f00-e57d-5684-b7b6-d8193f3e46c0"
+# JSON = "682c06a0-de6a-54ab-a142-c8b1cf79cde6"
+# LaTeXStrings = "b964fa9f-0449-5b57-a5c2-d3ea65f4040f"
+# Makie = "ee78f7c6-11fb-53f2-987a-cfe4a2b5a57a"
+# PlotlyBase = "a03496cd-edff-5a9b-9e67-9cda94a718b5"
+# PlotlyJS = "f0f68f2c-4968-5e81-91da-67840de0976a"
+# Plots = "91a5bcdd-55d7-5caf-9e0b-520d859cae80"
+# RCall = "6f49c342-dc21-5d91-9882-a32aef131414"
+# Revise = "295af30f-e4ad-537b-8983-00126c2a3abe"
+# SymPyCore = "458b697b-88f0-4a86-b56b-78b75cfb3531"
+# Tables = "bd369af6-aec1-5ad0-b16a-f7cc5008161c"
+#
+# [extensions]
+# QuartoNotebookWorkerCairoMakieExt = "CairoMakie"
+# QuartoNotebookWorkerDataFramesTablesExt = ["DataFrames", "Tables"]
+# QuartoNotebookWorkerJSONExt = "JSON"
+# QuartoNotebookWorkerLaTeXStringsExt = "LaTeXStrings"
+# QuartoNotebookWorkerMakieExt = "Makie"
+# QuartoNotebookWorkerPlotlyBaseExt = "PlotlyBase"
+# QuartoNotebookWorkerPlotlyJSExt = "PlotlyJS"
+# QuartoNotebookWorkerPlotsExt = "Plots"
+# QuartoNotebookWorkerRCallExt = "RCall"
+# QuartoNotebookWorkerReviseExt = "Revise"
+# QuartoNotebookWorkerSymPyCoreExt = "SymPyCore"
+#
 [preferences.QuartoNotebookWorker]
 packages = []
diff --git a/src/QuartoNotebookWorker/ext/QuartoNotebookWorkerCairoMakieExt.jl b/src/QuartoNotebookWorker/ext/QuartoNotebookWorkerCairoMakieExt.jl
index 37e666f..ec12643 100644
--- a/src/QuartoNotebookWorker/ext/QuartoNotebookWorkerCairoMakieExt.jl
+++ b/src/QuartoNotebookWorker/ext/QuartoNotebookWorkerCairoMakieExt.jl
@@ -1,7 +1,7 @@
 module QuartoNotebookWorkerCairoMakieExt
 
 import QuartoNotebookWorker
-import CairoMakie
+import ..CairoMakie
 
 function configure()
     fm = QuartoNotebookWorker._figure_metadata()
diff --git a/src/QuartoNotebookWorker/ext/QuartoNotebookWorkerDataFramesTablesExt.jl b/src/QuartoNotebookWorker/ext/QuartoNotebookWorkerDataFramesTablesExt.jl
index 1a941ba..2af0afe 100644
--- a/src/QuartoNotebookWorker/ext/QuartoNotebookWorkerDataFramesTablesExt.jl
+++ b/src/QuartoNotebookWorker/ext/QuartoNotebookWorkerDataFramesTablesExt.jl
@@ -1,8 +1,8 @@
 module QuartoNotebookWorkerDataFramesTablesExt
 
 import QuartoNotebookWorker
-import DataFrames
-import Tables
+import ..DataFrames
+import ..Tables
 
 QuartoNotebookWorker._ojs_convert(df::DataFrames.AbstractDataFrame) = Tables.rows(df)
 
diff --git a/src/QuartoNotebookWorker/ext/QuartoNotebookWorkerJSONExt.jl b/src/QuartoNotebookWorker/ext/QuartoNotebookWorkerJSONExt.jl
index 9affa56..f422a98 100644
--- a/src/QuartoNotebookWorker/ext/QuartoNotebookWorkerJSONExt.jl
+++ b/src/QuartoNotebookWorker/ext/QuartoNotebookWorkerJSONExt.jl
@@ -1,7 +1,7 @@
 module QuartoNotebookWorkerJSONExt
 
 import QuartoNotebookWorker
-import JSON
+import ..JSON
 
 function QuartoNotebookWorker._ojs_define(::QuartoNotebookWorker.OJSDefine, kwargs)
     contents = QuartoNotebookWorker.ojs_convert(kwargs)
diff --git a/src/QuartoNotebookWorker/ext/QuartoNotebookWorkerLaTeXStringsExt.jl b/src/QuartoNotebookWorker/ext/QuartoNotebookWorkerLaTeXStringsExt.jl
index 531f5b5..aeac18c 100644
--- a/src/QuartoNotebookWorker/ext/QuartoNotebookWorkerLaTeXStringsExt.jl
+++ b/src/QuartoNotebookWorker/ext/QuartoNotebookWorkerLaTeXStringsExt.jl
@@ -1,7 +1,7 @@
 module QuartoNotebookWorkerLaTeXStringsExt
 
 import QuartoNotebookWorker as QNW
-import LaTeXStrings as LS
+import ..LaTeXStrings as LS
 
 QNW._mimetype_wrapper(s::LS.LaTeXString) = LaTeXStringWrapper(s)
 
diff --git a/src/QuartoNotebookWorker/ext/QuartoNotebookWorkerMakieExt.jl b/src/QuartoNotebookWorker/ext/QuartoNotebookWorkerMakieExt.jl
index 910f199..4249c0e 100644
--- a/src/QuartoNotebookWorker/ext/QuartoNotebookWorkerMakieExt.jl
+++ b/src/QuartoNotebookWorker/ext/QuartoNotebookWorkerMakieExt.jl
@@ -1,7 +1,7 @@
 module QuartoNotebookWorkerMakieExt
 
 import QuartoNotebookWorker
-import Makie
+import ..Makie
 
 function configure()
     fm = QuartoNotebookWorker._figure_metadata()
diff --git a/src/QuartoNotebookWorker/ext/QuartoNotebookWorkerPlotlyBaseExt.jl b/src/QuartoNotebookWorker/ext/QuartoNotebookWorkerPlotlyBaseExt.jl
index a880295..aa9fdc2 100644
--- a/src/QuartoNotebookWorker/ext/QuartoNotebookWorkerPlotlyBaseExt.jl
+++ b/src/QuartoNotebookWorker/ext/QuartoNotebookWorkerPlotlyBaseExt.jl
@@ -1,7 +1,7 @@
 module QuartoNotebookWorkerPlotlyBaseExt
 
 import QuartoNotebookWorker
-import PlotlyBase
+import ..PlotlyBase
 
 struct PlotlyBasePlotWithoutRequireJS
     plot::PlotlyBase.Plot
diff --git a/src/QuartoNotebookWorker/ext/QuartoNotebookWorkerPlotlyJSExt.jl b/src/QuartoNotebookWorker/ext/QuartoNotebookWorkerPlotlyJSExt.jl
index b25cb6e..4b0ae81 100644
--- a/src/QuartoNotebookWorker/ext/QuartoNotebookWorkerPlotlyJSExt.jl
+++ b/src/QuartoNotebookWorker/ext/QuartoNotebookWorkerPlotlyJSExt.jl
@@ -1,7 +1,7 @@
 module QuartoNotebookWorkerPlotlyJSExt
 
 import QuartoNotebookWorker
-import PlotlyJS
+import ..PlotlyJS
 
 QuartoNotebookWorker.expand(p::PlotlyJS.SyncPlot) = QuartoNotebookWorker.expand(p.plot)
 
diff --git a/src/QuartoNotebookWorker/ext/QuartoNotebookWorkerPlotsExt.jl b/src/QuartoNotebookWorker/ext/QuartoNotebookWorkerPlotsExt.jl
index 880ad51..e576fca 100644
--- a/src/QuartoNotebookWorker/ext/QuartoNotebookWorkerPlotsExt.jl
+++ b/src/QuartoNotebookWorker/ext/QuartoNotebookWorkerPlotsExt.jl
@@ -1,7 +1,7 @@
 module QuartoNotebookWorkerPlotsExt
 
 import QuartoNotebookWorker
-import Plots
+import ..Plots
 
 function configure()
     fm = QuartoNotebookWorker._figure_metadata()
diff --git a/src/QuartoNotebookWorker/ext/QuartoNotebookWorkerRCallExt.jl b/src/QuartoNotebookWorker/ext/QuartoNotebookWorkerRCallExt.jl
index 672e4fc..e1ffeb6 100644
--- a/src/QuartoNotebookWorker/ext/QuartoNotebookWorkerRCallExt.jl
+++ b/src/QuartoNotebookWorker/ext/QuartoNotebookWorkerRCallExt.jl
@@ -1,7 +1,7 @@
 module QuartoNotebookWorkerRCallExt
 
 import QuartoNotebookWorker
-import RCall
+import ..RCall
 
 const RCall_temp_files_ref = Ref{String}()
 const rcalljl_device_ref = Ref{Symbol}(:png)
diff --git a/src/QuartoNotebookWorker/ext/QuartoNotebookWorkerReviseExt.jl b/src/QuartoNotebookWorker/ext/QuartoNotebookWorkerReviseExt.jl
index 613773b..0fce08c 100644
--- a/src/QuartoNotebookWorker/ext/QuartoNotebookWorkerReviseExt.jl
+++ b/src/QuartoNotebookWorker/ext/QuartoNotebookWorkerReviseExt.jl
@@ -1,10 +1,10 @@
 module QuartoNotebookWorkerReviseExt
 
-import Revise
+import ..Revise
 import QuartoNotebookWorker
 
 function __init__()
-    @debug "extension has been loaded" Revise QuartoNotebookWorker
+    @info "extension has been loaded" Revise QuartoNotebookWorker
 end
 
 end
diff --git a/src/QuartoNotebookWorker/ext/QuartoNotebookWorkerSymPyCoreExt.jl b/src/QuartoNotebookWorker/ext/QuartoNotebookWorkerSymPyCoreExt.jl
index bc74055..5a08649 100644
--- a/src/QuartoNotebookWorker/ext/QuartoNotebookWorkerSymPyCoreExt.jl
+++ b/src/QuartoNotebookWorker/ext/QuartoNotebookWorkerSymPyCoreExt.jl
@@ -1,7 +1,7 @@
 module QuartoNotebookWorkerSymPyCoreExt
 
 import QuartoNotebookWorker as QNW
-import SymPyCore as SPC
+import ..SymPyCore as SPC
 
 QNW._mimetype_wrapper(s::SPC.SymbolicObject) = SymWrapper(s)
 QNW._mimetype_wrapper(s::AbstractArray{<:SPC.Sym}) = SymWrapper(s)
diff --git a/src/QuartoNotebookWorker/src/QuartoNotebookWorker.jl b/src/QuartoNotebookWorker/src/QuartoNotebookWorker.jl
index ad095b7..930a21a 100644
--- a/src/QuartoNotebookWorker/src/QuartoNotebookWorker.jl
+++ b/src/QuartoNotebookWorker/src/QuartoNotebookWorker.jl
@@ -75,9 +75,43 @@ end
 # Handle older versions of Julia that don't have support for package extensions.
 # Note that this macro must be called in the root-module of a package, otherwise
 # `pathof(__module__)` will be `nothing`.
-import .Packages.PackageExtensionCompat: @require_extensions
+import .Packages.Requires
 function __init__()
-    @require_extensions
+    Requires.@require CairoMakie = "13f3f980-e62b-5c42-98c6-ff1f3baf88f0" include(
+        "../ext/QuartoNotebookWorkerCairoMakieExt.jl",
+    )
+    Requires.@require DataFrames = "a93c6f00-e57d-5684-b7b6-d8193f3e46c0" begin
+        Requires.@require Tables = "bd369af6-aec1-5ad0-b16a-f7cc5008161c" include(
+            "../ext/QuartoNotebookWorkerDataFramesTablesExt.jl",
+        )
+    end
+    Requires.@require JSON = "682c06a0-de6a-54ab-a142-c8b1cf79cde6" include(
+        "../ext/QuartoNotebookWorkerJSONExt.jl",
+    )
+    Requires.@require LaTeXStrings = "b964fa9f-0449-5b57-a5c2-d3ea65f4040f" include(
+        "../ext/QuartoNotebookWorkerLaTeXStringsExt.jl",
+    )
+    Requires.@require Makie = "ee78f7c6-11fb-53f2-987a-cfe4a2b5a57a" include(
+        "../ext/QuartoNotebookWorkerMakieExt.jl",
+    )
+    Requires.@require PlotlyBase = "a03496cd-edff-5a9b-9e67-9cda94a718b5" include(
+        "../ext/QuartoNotebookWorkerPlotlyBaseExt.jl",
+    )
+    Requires.@require PlotlyJS = "f0f68f2c-4968-5e81-91da-67840de0976a" include(
+        "../ext/QuartoNotebookWorkerPlotlyJSExt.jl",
+    )
+    Requires.@require Plots = "91a5bcdd-55d7-5caf-9e0b-520d859cae80" include(
+        "../ext/QuartoNotebookWorkerPlotsExt.jl",
+    )
+    Requires.@require RCall = "6f49c342-dc21-5d91-9882-a32aef131414" include(
+        "../ext/QuartoNotebookWorkerRCallExt.jl",
+    )
+    Requires.@require Revise = "295af30f-e4ad-537b-8983-00126c2a3abe" include(
+        "../ext/QuartoNotebookWorkerReviseExt.jl",
+    )
+    Requires.@require SymPyCore = "458b697b-88f0-4a86-b56b-78b75cfb3531" include(
+        "../ext/QuartoNotebookWorkerSymPyCoreExt.jl",
+    )
 end
 
 # Imports.
diff --git a/src/WorkerSetup.jl b/src/WorkerSetup.jl
index 35744b5..04184c4 100644
--- a/src/WorkerSetup.jl
+++ b/src/WorkerSetup.jl
@@ -24,7 +24,7 @@ import TOML
 # Vendored packages.
 
 import IOCapture
-import PackageExtensionCompat
+import Requires
 
 # Dependency detection.
 
@@ -103,7 +103,7 @@ end
 const VENDORED_PACKAGES = package_information([
     # This contains the entry point files for each vendored package.
     IOCapture,
-    PackageExtensionCompat,
+    Requires,
 ])
 
 # So that we key the loader environment on the vendored package versions.