diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index 2488a7a..99fdc3a 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -45,7 +45,7 @@ jobs:
         run: mkdir -p output && cp specification/sbolvisual.pdf output
 
       - name: Upload PDF as build artifact
-        uses: actions/upload-artifact@v1.0.0
+        uses: actions/upload-artifact@v4.0.0
         with:
           name: PDF
           path: output
@@ -88,7 +88,7 @@ jobs:
         run: python3 scripts/generate_sampler.py
 
       - name: Upload samplers as artifact
-        uses: actions/upload-artifact@v1.0.0
+        uses: actions/upload-artifact@v4.0.0
         with:
           name: samplers
           path: sampler
@@ -141,19 +141,19 @@ jobs:
         run: python3 scripts/collate_glyphs.py
 
       - name: Upload zipfile of SVGs
-        uses: actions/upload-artifact@v1.0.0
+        uses: actions/upload-artifact@v4.0.0
         with:
           name: SVG Glyphs
           path: glyph_collections/svg
 
       - name: Upload zipfile of PDFs
-        uses: actions/upload-artifact@v1.0.0
+        uses: actions/upload-artifact@v4.0.0
         with:
           name: PDF Glyphs
           path: glyph_collections/pdf
 
       - name: Upload zipfile of PNGs
-        uses: actions/upload-artifact@v1.0.0
+        uses: actions/upload-artifact@v4.0.0
         with:
           name: PNG Glyphs
           path: glyph_collections/png
diff --git a/Glyphs/SequenceFeatures/cds/README.md b/Glyphs/SequenceFeatures/cds/README.md
index 4c46d97..04f59a9 100644
--- a/Glyphs/SequenceFeatures/cds/README.md
+++ b/Glyphs/SequenceFeatures/cds/README.md
@@ -8,6 +8,10 @@ The coding sequence glyph is a "box" with one side bent out arrow-like to show d
 
 ![glyph specification](cds-specification.png)
 
+Alternately, CDS may be aligned to the backbone with the bottom of the glyph instead of the middle:
+
+![glyph specification](cds-specification-altalign.png)
+
 Alternately, CDS may be represented as a block arrow:
 
 ![glyph specification](cds-arrow-specification.png)
diff --git a/Glyphs/SequenceFeatures/cds/cds-specification-altalign.png b/Glyphs/SequenceFeatures/cds/cds-specification-altalign.png
new file mode 100644
index 0000000..2fb916c
Binary files /dev/null and b/Glyphs/SequenceFeatures/cds/cds-specification-altalign.png differ
diff --git a/Glyphs/SequenceFeatures/cds/cds-specification-altalign.svg b/Glyphs/SequenceFeatures/cds/cds-specification-altalign.svg
new file mode 100644
index 0000000..d8ac51e
--- /dev/null
+++ b/Glyphs/SequenceFeatures/cds/cds-specification-altalign.svg
@@ -0,0 +1,77 @@
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+   viewBox="0 0 44.999998 44.999998"
+   version="1.1"
+   xml:space="preserve"
+   x="0px"
+   y="0px"
+   width="0.5in"
+   height="0.5in"
+   id="svg2"
+   inkscape:version="1.4.4 (dcaf3e7, 2026-05-05)"
+   sodipodi:docname="cds-specification-altalign.svg"
+   inkscape:export-filename="/Users/jakebeal/projects/SBOL/SBOLv-realizations/Glyphs/cds/cds-specification-middle.png"
+   inkscape:export-xdpi="300"
+   inkscape:export-ydpi="300"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:dc="http://purl.org/dc/elements/1.1/"><metadata
+     id="metadata12"><rdf:RDF><cc:Work
+         rdf:about=""><dc:format>image/svg+xml</dc:format><dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" /></cc:Work></rdf:RDF></metadata><sodipodi:namedview
+     pagecolor="#ffffff"
+     bordercolor="#666666"
+     borderopacity="1"
+     objecttolerance="10"
+     gridtolerance="10"
+     guidetolerance="10"
+     inkscape:pageopacity="0"
+     inkscape:pageshadow="2"
+     inkscape:window-width="1920"
+     inkscape:window-height="991"
+     id="namedview10"
+     showgrid="false"
+     units="in"
+     inkscape:zoom="9.44"
+     inkscape:cx="25"
+     inkscape:cy="24.523305"
+     inkscape:window-x="-9"
+     inkscape:window-y="-9"
+     inkscape:window-maximized="1"
+     inkscape:current-layer="svg2"
+     inkscape:showpageshadow="0"
+     inkscape:pagecheckerboard="0"
+     inkscape:deskcolor="#d1d1d1"
+     inkscape:document-units="in" /><defs
+     id="defs4"><style
+       type="text/css"
+       id="style6"><![CDATA[
+      path,circle {
+        stroke:#000000;
+        stroke-width: 3;
+        stroke-linecap: round;
+        stroke-linejoin: round;
+        fill: none
+      }]]></style></defs><path
+     style="opacity:1;fill:none;fill-opacity:1;stroke:#b3b3b3;stroke-width:0.5;stroke-linecap:round;stroke-linejoin:miter;stroke-miterlimit:4;stroke-dasharray:1, 0.5;stroke-dashoffset:0;stroke-opacity:1"
+     d="M 0,33.749997 H 45.233046"
+     id="path4135"
+     inkscape:connector-curvature="0"
+     inkscape:export-filename="cds-specification-altalign.png"
+     inkscape:export-xdpi="300"
+     inkscape:export-ydpi="300" /><path
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+     inkscape:connector-curvature="0"
+     style="fill:#e6e6e6;stroke:#000000;stroke-width:2.99544764;stroke-linecap:round;stroke-linejoin:round"
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+     id="rect3340"
+     width="37.60593"
+     height="25.741522"
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