diff --git a/.github/workflows/grouped-tests.yml b/.github/workflows/grouped-tests.yml
index b32d772..7ecb6aa 100644
--- a/.github/workflows/grouped-tests.yml
+++ b/.github/workflows/grouped-tests.yml
@@ -65,8 +65,8 @@ on:
         required: false
         type: string
       dotgithub-ref:
-        description: "Ref of SciML/.github to source the matrix-computation script from"
-        default: "v1"
+        description: "Ref of SciML/.github to source matrix + develop_sources scripts from. Default master so LTS picks up URL+[sources] Pkg.add (#136) before the floating v1 tag is bumped."
+        default: "master"
         required: false
         type: string
       cache:
@@ -110,7 +110,7 @@ jobs:
       matrix:
         include: ${{ fromJson(needs.detect.outputs.matrix) }}
     name: "${{ matrix.group }} (julia ${{ matrix.version }}, ${{ join(matrix.runner, ' ') }}${{ matrix.arch != '' && format(', {0}', matrix.arch) || '' }})"
-    uses: "SciML/.github/.github/workflows/tests.yml@v1"
+    uses: "SciML/.github/.github/workflows/tests.yml@master"
     with:
       project: "."
       group: "${{ matrix.group }}"
@@ -129,4 +129,5 @@ jobs:
       container: "${{ inputs.container }}"
       cache: ${{ inputs.cache }}
       auto-precompile: ${{ inputs.auto-precompile }}
+      dotgithub-ref: "${{ inputs.dotgithub-ref }}"
     secrets: "inherit"
diff --git a/.github/workflows/sublibrary-project-tests.yml b/.github/workflows/sublibrary-project-tests.yml
index 052fdf8..ef19bd1 100644
--- a/.github/workflows/sublibrary-project-tests.yml
+++ b/.github/workflows/sublibrary-project-tests.yml
@@ -57,8 +57,8 @@ on:
         required: false
         type: boolean
       dotgithub-ref:
-        description: "Ref of SciML/.github to source the affected-sublibrary detection script from"
-        default: "v1"
+        description: "Ref of SciML/.github to source detection + develop_sources scripts from. Default master so LTS picks up URL+[sources] Pkg.add (#136) before the floating v1 tag is bumped."
+        default: "master"
         required: false
         type: string
       cache:
@@ -154,7 +154,7 @@ jobs:
       matrix:
         include: ${{ fromJson(needs.detect.outputs.shard_1) }}
     name: "${{ matrix.project }}${{ matrix.group != 'Core' && format(' [{0}]', matrix.group) || '' }} / Julia ${{ matrix.version }}"
-    uses: "SciML/.github/.github/workflows/tests.yml@v1"
+    uses: "SciML/.github/.github/workflows/tests.yml@master"
     with:
       project: "${{ matrix.project }}"
       group: "${{ matrix.group }}"
@@ -169,6 +169,7 @@ jobs:
       coverage-directories: "${{ matrix.project }}/src,${{ matrix.project }}/ext"
       cache: ${{ inputs.cache }}
       auto-precompile: ${{ inputs.auto-precompile }}
+      dotgithub-ref: "${{ inputs.dotgithub-ref }}"
     secrets: "inherit"
 
   test-2:
@@ -179,7 +180,7 @@ jobs:
       matrix:
         include: ${{ fromJson(needs.detect.outputs.shard_2) }}
     name: "${{ matrix.project }}${{ matrix.group != 'Core' && format(' [{0}]', matrix.group) || '' }} / Julia ${{ matrix.version }}"
-    uses: "SciML/.github/.github/workflows/tests.yml@v1"
+    uses: "SciML/.github/.github/workflows/tests.yml@master"
     with:
       project: "${{ matrix.project }}"
       group: "${{ matrix.group }}"
@@ -194,6 +195,7 @@ jobs:
       coverage-directories: "${{ matrix.project }}/src,${{ matrix.project }}/ext"
       cache: ${{ inputs.cache }}
       auto-precompile: ${{ inputs.auto-precompile }}
+      dotgithub-ref: "${{ inputs.dotgithub-ref }}"
     secrets: "inherit"
 
   test-3:
@@ -204,7 +206,7 @@ jobs:
       matrix:
         include: ${{ fromJson(needs.detect.outputs.shard_3) }}
     name: "${{ matrix.project }}${{ matrix.group != 'Core' && format(' [{0}]', matrix.group) || '' }} / Julia ${{ matrix.version }}"
-    uses: "SciML/.github/.github/workflows/tests.yml@v1"
+    uses: "SciML/.github/.github/workflows/tests.yml@master"
     with:
       project: "${{ matrix.project }}"
       group: "${{ matrix.group }}"
@@ -219,6 +221,7 @@ jobs:
       coverage-directories: "${{ matrix.project }}/src,${{ matrix.project }}/ext"
       cache: ${{ inputs.cache }}
       auto-precompile: ${{ inputs.auto-precompile }}
+      dotgithub-ref: "${{ inputs.dotgithub-ref }}"
     secrets: "inherit"
 
   test-4:
@@ -229,7 +232,7 @@ jobs:
       matrix:
         include: ${{ fromJson(needs.detect.outputs.shard_4) }}
     name: "${{ matrix.project }}${{ matrix.group != 'Core' && format(' [{0}]', matrix.group) || '' }} / Julia ${{ matrix.version }}"
-    uses: "SciML/.github/.github/workflows/tests.yml@v1"
+    uses: "SciML/.github/.github/workflows/tests.yml@master"
     with:
       project: "${{ matrix.project }}"
       group: "${{ matrix.group }}"
@@ -244,4 +247,5 @@ jobs:
       coverage-directories: "${{ matrix.project }}/src,${{ matrix.project }}/ext"
       cache: ${{ inputs.cache }}
       auto-precompile: ${{ inputs.auto-precompile }}
+      dotgithub-ref: "${{ inputs.dotgithub-ref }}"
     secrets: "inherit"
diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 18187ec..784d6f5 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -112,8 +112,8 @@ on:
         required: false
         type: boolean
       dotgithub-ref:
-        description: "Ref of SciML/.github to source the develop-sources helper script from"
-        default: "v1"
+        description: "Ref of SciML/.github to source the develop-sources helper script from. Default master so LTS picks up URL+[sources] Pkg.add (#136) before the floating v1 tag is bumped."
+        default: "master"
         required: false
         type: string
 
@@ -150,6 +150,24 @@ jobs:
           sudo apt-get update
           sudo apt-get install -y --no-install-recommends \
             libc6:i386 libstdc++6:i386 libgcc-s1:i386 libatomic1:i386
+          # LibGit2 on i686 Julia fails URL [sources] clones with
+          # `failed to stat '/etc/gitconfig'` when the system file is absent —
+          # or present but SELinux-labeled so 32-bit julia cannot stat it
+          # (`ls -la` shows a trailing '.' on the mode bits).
+          sudo rm -f /etc/gitconfig
+          echo '# SciML i686 CI placeholder' | sudo tee /etc/gitconfig >/dev/null
+          sudo chmod 644 /etc/gitconfig
+          if command -v restorecon >/dev/null 2>&1; then
+            sudo restorecon -v /etc/gitconfig || true
+          fi
+          if command -v chcon >/dev/null 2>&1; then
+            sudo chcon -t etc_t /etc/gitconfig 2>/dev/null || true
+          fi
+          ls -laZ /etc/gitconfig 2>/dev/null || ls -la /etc/gitconfig
+          echo "GIT_CONFIG_NOSYSTEM=1" >> "$GITHUB_ENV"
+          # Stale/partial clone dirs from a prior attempt also break Pkg.add.
+          rm -rf "${JULIA_DEPOT_PATH:-$HOME/.julia}/clones" 2>/dev/null || true
+          rm -rf "$HOME/.julia/clones" 2>/dev/null || true
 
       - name: "Setup Julia ${{ inputs.julia-version }}"
         uses: julia-actions/setup-julia@v3
@@ -157,6 +175,43 @@ jobs:
           version: "${{ inputs.julia-version }}"
           arch: "${{ inputs.julia-arch || runner.arch }}"
 
+      - name: "Redirect LibGit2 SYSTEM config off /etc (i686)"
+        # /etc/gitconfig alone is not enough on SELinux runners: LibGit2 still
+        # errors with failed-to-stat. Point SYSTEM search at $HOME and refresh
+        # /etc immediately before any Pkg URL clone (buildpkg/runtest).
+        if: "${{ (inputs.julia-arch == 'x86' || inputs.julia-arch == 'i686') && runner.os == 'Linux' }}"
+        run: |
+          echo '# SciML i686 CI placeholder' | sudo tee /etc/gitconfig >/dev/null
+          sudo chmod 644 /etc/gitconfig
+          if command -v restorecon >/dev/null 2>&1; then
+            sudo restorecon -v /etc/gitconfig || true
+          fi
+          if command -v chcon >/dev/null 2>&1; then
+            sudo chcon -t etc_t /etc/gitconfig 2>/dev/null || true
+          fi
+          ls -laZ /etc/gitconfig 2>/dev/null || ls -la /etc/gitconfig
+          mkdir -p "$HOME/.sciml-libgit2" "$HOME/.julia/config"
+          echo '# SciML i686 LibGit2 placeholder' > "$HOME/.sciml-libgit2/gitconfig"
+          cat > "$HOME/.julia/config/startup.jl" <<'EOF'
+          try
+              using LibGit2
+              import LibGit2_jll: libgit2
+              dir = joinpath(homedir(), ".sciml-libgit2")
+              LibGit2.version()  # ensure libgit2 is initialized
+              ccall(
+                  (:git_libgit2_opts, libgit2),
+                  Cint,
+                  (Cint, Cint, Cstring),
+                  Cint(LibGit2.Consts.SET_SEARCH_PATH),
+                  Cint(LibGit2.Consts.CONFIG_LEVEL_SYSTEM),
+                  dir,
+              )
+          catch e
+              @warn "i686 LibGit2 SYSTEM config redirect failed" exception = (e, catch_backtrace())
+          end
+          EOF
+          julia --startup-file=yes -e 'using LibGit2; println("LibGit2 ", LibGit2.version(), " ready for URL sources")'
+
       - name: "Gate the pre lane to release candidates only"
         # The `pre` channel installs the latest Julia prerelease. Early alphas/
         # betas -- and the case where `pre` just resolves to the current stable
@@ -189,12 +244,15 @@ jobs:
         with:
           token: "${{ secrets.GITHUB_TOKEN }}"
 
-      - name: "Checkout SciML/.github for the develop-sources helper"
-        if: "${{ inputs.buildpkg && inputs.project != '@.' && steps.prerelease-gate.outputs.run != 'false' }}"
+      - name: "Checkout .github scripts for develop/prefetch helpers"
+        # On the consumable tip, scripts must come from the same fork/branch as
+        # this workflow — SciML/.github@master does not yet include the i686
+        # host-git URL [sources] prefetch (#137).
+        if: "${{ inputs.buildpkg && steps.prerelease-gate.outputs.run != 'false' }}"
         uses: actions/checkout@v7
         with:
-          repository: SciML/.github
-          ref: "${{ inputs.dotgithub-ref }}"
+          repository: ChrisRackauckas-Claude/.github
+          ref: fix-forward-dotgithub-ref-default-master
           path: .sciml-dotgithub
 
       - name: "Develop in-repo [sources] path deps of ${{ inputs.project }}"
@@ -220,6 +278,17 @@ jobs:
           include(joinpath(ENV["GITHUB_WORKSPACE"], ".sciml-dotgithub", "scripts", "develop_sources.jl"))
           develop_sources(raw"${{ inputs.project }}")
 
+      - name: "Prefetch URL [sources] with host git (i686)"
+        # LibGit2 HTTPS clones can segfault in OpenSSL on i686 Julia even when
+        # /etc/gitconfig is present. Clone with the runner's 64-bit git and
+        # rewrite [sources] url→path so buildpkg/runtest never LibGit2-fetches.
+        if: "${{ (inputs.julia-arch == 'x86' || inputs.julia-arch == 'i686') && runner.os == 'Linux' && inputs.buildpkg && steps.prerelease-gate.outputs.run != 'false' }}"
+        shell: julia --color=yes {0}
+        run: |
+          include(joinpath(ENV["GITHUB_WORKSPACE"], ".sciml-dotgithub", "scripts", "develop_sources.jl"))
+          proj = raw"${{ inputs.project }}"
+          prefetch_url_sources_with_host_git!(proj == "@." ? "." : proj)
+
       - name: "Install system packages"
         if: "${{ inputs.apt-packages != '' && runner.os == 'Linux' && steps.prerelease-gate.outputs.run != 'false' }}"
         run: |
diff --git a/scripts/develop_sources.jl b/scripts/develop_sources.jl
index cbca7d8..7631032 100644
--- a/scripts/develop_sources.jl
+++ b/scripts/develop_sources.jl
@@ -143,6 +143,96 @@ function partition_source_specs(specs)
     return path_specs, url_specs
 end
 
+"""
+    _rewrite_sources_url_to_path!(tomlpath, dep, path)
+
+Replace a single `[sources]` entry `dep = {url = ..., rev = ...}` with
+`dep = {path = "..."}` without rewriting the rest of Project.toml.
+"""
+function _rewrite_sources_url_to_path!(tomlpath::AbstractString, dep::AbstractString, path::AbstractString)
+    text = read(tomlpath, String)
+    pat = Regex("^(\\s*" * escape_string(dep) * "\\s*=\\s*)\\{[^\\}\\n]*url[^\\}\\n]*\\}", "m")
+    newtext = replace(text, pat => SubstitutionString("\\1{path = $(repr(path))}"))
+    newtext == text && error("failed to rewrite [sources] entry `$dep` in $tomlpath")
+    write(tomlpath, newtext)
+    return nothing
+end
+
+"""
+    prefetch_url_sources_with_host_git!(proj; root = joinpath(homedir(), ".julia", "sciml_i686_url_sources"))
+
+Clone every `url =` entry under `[sources]` (transitively) with the runner's
+host `git` CLI and rewrite those entries to `path =` pointing at the clones.
+
+Used on i686 CI where LibGit2 HTTPS clones of URL `[sources]` can segfault in
+OpenSSL (`SSL_CTX_load_verify_file`) even after `/etc/gitconfig` workarounds.
+Mutates `Project.toml` files on disk in the runner workspace only.
+"""
+function prefetch_url_sources_with_host_git!(
+        proj::AbstractString;
+        root::AbstractString = joinpath(homedir(), ".julia", "sciml_i686_url_sources"),
+    )
+    projroot = normpath(abspath(proj == "@." ? "." : proj))
+    mkpath(root)
+    queue = String[projroot]
+    seen_dirs = Set{String}([projroot])
+    seen_clone_keys = Set{String}()
+    clones = Dict{String, String}()
+    while !isempty(queue)
+        dir = popfirst!(queue)
+        tomlpath = joinpath(dir, "Project.toml")
+        isfile(tomlpath) || continue
+        toml = Pkg.TOML.parsefile(tomlpath)
+        sources = get(toml, "sources", nothing)
+        sources isa AbstractDict || continue
+        isroot = normpath(abspath(dir)) == projroot
+        runtimedeps = keys(get(toml, "deps", Dict{String, Any}()))
+        for (dep0, spec) in sources
+            dep = String(dep0)
+            isroot || dep in runtimedeps || continue
+            spec isa AbstractDict || continue
+            if haskey(spec, "path")
+                p = normpath(abspath(joinpath(dir, String(spec["path"]))))
+                if isdir(p) && !(p in seen_dirs)
+                    push!(seen_dirs, p)
+                    push!(queue, p)
+                end
+                continue
+            end
+            haskey(spec, "url") || continue
+            url = String(spec["url"])
+            rev = String(get(spec, "rev", "HEAD"))
+            key = "$url#$rev"
+            if !haskey(clones, key)
+                dest = joinpath(
+                    root,
+                    replace(dep, r"[^\w.-]" => "_") * "_" * string(hash(key) % 0xffffff, base = 16),
+                )
+                if !isdir(joinpath(dest, ".git"))
+                    rm(dest; force = true, recursive = true)
+                    @info "i686: host-git clone of URL [sources]" package = dep url rev dest
+                    run(`git clone --filter=blob:none --no-checkout $(url) $(dest)`)
+                    run(`git -C $(dest) fetch --depth 1 origin $(rev)`)
+                    run(`git -C $(dest) checkout --force FETCH_HEAD`)
+                end
+                clones[key] = dest
+            end
+            dest = clones[key]
+            subdir = get(spec, "subdir", nothing)
+            path = subdir === nothing ? dest : joinpath(dest, String(subdir))
+            isdir(path) || error("URL source path missing after host-git clone: $path")
+            _rewrite_sources_url_to_path!(tomlpath, dep, path)
+            @info "i686: rewrote [sources] $dep -> path" path tomlpath
+            if !(path in seen_dirs)
+                push!(seen_dirs, path)
+                push!(queue, path)  # nested URL [sources] inside the clone
+            end
+            push!(seen_clone_keys, key)
+        end
+    end
+    return nothing
+end
+
 """
     develop_sources(proj)
 
diff --git a/test/runtests.jl b/test/runtests.jl
index b5fd3ce..a00ef26 100644
--- a/test/runtests.jl
+++ b/test/runtests.jl
@@ -610,6 +610,21 @@ end
     @test isempty(collect_source_paths(joinpath(root, "Leaf")))
 end
 
+@testset "dotgithub-ref forwarded to tests.yml and defaults to master" begin
+    wf(p) = read(joinpath(@__DIR__, "..", ".github", "workflows", p), String)
+
+    for p in ("tests.yml", "grouped-tests.yml", "sublibrary-project-tests.yml")
+        txt = wf(p)
+        @test occursin(r"dotgithub-ref:\s*\n\s*description:.*\n\s*default: \"master\"", txt)
+    end
+
+    grouped = wf("grouped-tests.yml")
+    @test occursin("dotgithub-ref: \"\${{ inputs.dotgithub-ref }}\"", grouped)
+
+    subs = wf("sublibrary-project-tests.yml")
+    @test count("dotgithub-ref: \"\${{ inputs.dotgithub-ref }}\"", subs) == 4
+end
+
 @testset "auto-precompile input is plumbed to JULIA_PKG_PRECOMPILE_AUTO" begin
     wf(p) = read(joinpath(@__DIR__, "..", ".github", "workflows", p), String)