diff --git a/Project.toml b/Project.toml
index 2165f60..f2db444 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,15 +1,20 @@
 name = "ImageGeoms"
 uuid = "9ee76f2b-840d-4475-b6d6-e485c9297852"
 authors = ["Jeff Fessler <fessler@umich.edu> and contributors"]
-version = "0.10"
+version = "0.10.1"
 
 [deps]
 FillArrays = "1a297f60-69ca-5386-bcde-b61e274b549b"
 LazyGrids = "7031d0ef-c40d-4431-b2f8-61a8d2f650db"
-Requires = "ae029012-a4dd-5104-9daa-d747884805df"
 
 [compat]
-FillArrays = "0.13, 1"
+FillArrays = "1"
 LazyGrids = "0.4, 0.5"
-Requires = "1.3"
-julia = "1.8"
+MIRTjim = "0.23"
+julia = "1.10"
+
+[weakdeps]
+MIRTjim = "170b2178-6dee-4cb0-8729-b3e8b57834cc"
+
+[extensions]
+ImageGeoms_MIRTjim = "MIRTjim"
diff --git a/README.md b/README.md
index c3e0e3f..058fa2a 100644
--- a/README.md
+++ b/README.md
@@ -61,7 +61,7 @@ see the
 
 ### Compatibility
 
-Tested with Julia ≥ 1.8.
+Tested with Julia ≥ 1.10.
 
 <!-- URLs -->
 [action-img]: https://github.com/JuliaImageRecon/ImageGeoms.jl/workflows/CI/badge.svg
diff --git a/docs/lit/examples/2-mask.jl b/docs/lit/examples/2-mask.jl
index ddd6465..383cfc6 100644
--- a/docs/lit/examples/2-mask.jl
+++ b/docs/lit/examples/2-mask.jl
@@ -12,10 +12,10 @@ This page explains the `mask` aspects of the Julia package
 
 # Packages needed here.
 
-using MIRTjim: jim, prompt # must be first!
 using ImageGeoms: ImageGeom, MaskCircle, MaskAllButEdge
-using ImageGeoms: maskit, embed, embed!, getindex!, jim #, size
+using ImageGeoms: maskit, embed, embed!, getindex! # +jim +size
 using ImageGeoms: mask_outline
+using MIRTjim: jim, prompt
 using Unitful: mm
 
 
diff --git a/src/jim.jl b/ext/ImageGeoms_MIRTjim.jl
similarity index 69%
rename from src/jim.jl
rename to ext/ImageGeoms_MIRTjim.jl
index 524e000..8460286 100644
--- a/src/jim.jl
+++ b/ext/ImageGeoms_MIRTjim.jl
@@ -1,15 +1,14 @@
-# jim.jl
+# ImageGeoms_MIRTjim.jl
 
-import .MIRTjim: jim
+module ImageGeoms_MIRTjim
 
-#using ImageGeoms: ImageGeom
-
-export jim
+using ImageGeoms: ImageGeom, axis, mask_or
+import MIRTjim: jim
 
 
 """
     jim(ig ; kwargs...)
-Display the support mask.
+Display the support mask (2D) or `mask_or` (3D).
 Requires package `MIRTjim` to be loaded first.
 """
 jim(ig::ImageGeom{2} ; kwargs...) =
@@ -18,3 +17,5 @@ jim(ig::ImageGeom{3} ; kwargs...) =
     jim(axis(ig,1), axis(ig,2), mask_or(ig.mask) ;
         title = "(dx,dy,dz)=$(ig.deltas)", kwargs...)
 jim(ig::ImageGeom ; kwargs...) = throw("unsupported $(typeof(ig))")
+
+end # module
diff --git a/src/ImageGeoms.jl b/src/ImageGeoms.jl
index de00718..2e9d0c0 100644
--- a/src/ImageGeoms.jl
+++ b/src/ImageGeoms.jl
@@ -4,8 +4,6 @@ Module for describing image geometries.
 """
 module ImageGeoms
 
-using Requires: @require
-
 const RealU = Number # Union{Real, Unitful.Length}
 
 """
@@ -26,9 +24,4 @@ include("imresize.jl")
 include("makemask.jl")
 include("mask.jl")
 
-function __init__()
-    # support MIRTjim iff user has loaded it
-    @require MIRTjim = "170b2178-6dee-4cb0-8729-b3e8b57834cc" include("jim.jl")
-end
-
 end # module
diff --git a/src/mask.jl b/src/mask.jl
index d6020a6..1945f7e 100644
--- a/src/mask.jl
+++ b/src/mask.jl
@@ -89,11 +89,11 @@ embed(v::AbstractVector{T}, mask::AbstractArray{Bool} ;
     array = embed(matrix::AbstractMatrix{<:Number}, mask::AbstractArray{Bool})
 
 Embed each column of `matrix` into `mask` then `cat` along next dimension
-In:
+# In:
 * `matrix [count(mask) L]`
 * `mask [(N)]`
 
-Out:
+# Out:
 * `array [(N) L]`
 """
 function embed(x::AbstractMatrix{<:Number}, mask::AbstractArray{Bool})