diff --git a/changes/27.3.5.md b/changes/27.3.5.md
index d619c488a..28128cbc2 100644
--- a/changes/27.3.5.md
+++ b/changes/27.3.5.md
@@ -1,2 +1,4 @@
 * Add italic form of CYRILLIC SMALL LETTER THREE-LEGGED TE (`U+1C85`).
 * Add top-right serif to fully serifed form for CYRILLIC SMALL LETTER TALL TE (`U+1C84`).
+* Fix serifs of GREEK LETTER DIGAMMA (`U+03DC`) under `ss12`.
+* Improve glyph shape of GREEK SMALL LETTER DIGAMMA (`U+03DD`) with the addition of a tailed terminal, higher crossbar, and a middle serif under slab.
diff --git a/font-src/glyphs/letter/greek/upper-gamma.ptl b/font-src/glyphs/letter/greek/upper-gamma.ptl
index e62c91d2e..e5e7d1ae8 100644
--- a/font-src/glyphs/letter/greek/upper-gamma.ptl
+++ b/font-src/glyphs/letter/greek/upper-gamma.ptl
@@ -41,13 +41,13 @@ glyph-block Letter-Greek-Upper-Gamma: begin
 				include : tagged 'serifRT' : VSerif.dr (RightSB - OX) top VJut
 
 	define GammaConfig : object
-		serifless       { SLAB-NONE   false }
-		topLeftSerifed  { SLAB-LT     false }
-		topRightSerifed { SLAB-TR     false }
-		bottomSerifed   { SLAB-BOTTOM false }
-		serifed         { SLAB-ALL    true  }
+		serifless       { SLAB-NONE   SLAB }
+		topLeftSerifed  { SLAB-LT     SLAB }
+		topRightSerifed { SLAB-TR     true }
+		bottomSerifed   { SLAB-BOTTOM SLAB }
+		serifed         { SLAB-ALL    true }
 
-	foreach { suffix { slabType doSB } } [Object.entries GammaConfig] : do
+	foreach { suffix { slabType doSM } } [Object.entries GammaConfig] : do
 		create-glyph "grek/Gamma.\(suffix)" : glyph-proc
 			include : MarkSet.capital
 			include : GammaShape CAP slabType
@@ -57,9 +57,9 @@ glyph-block Letter-Greek-Upper-Gamma: begin
 			include : GammaShape CAP slabType
 
 			local yBar : CAP * DesignParameters.upperEBarPos
-			include : HBar.m GammaBarLeft (RightSB - [xMidBarShrink slabType]) yBar
-			if slabType : include : tagged 'serifRM'
-				VSerif.dr (RightSB - [xMidBarShrink slabType]) (yBar + HalfStroke) [mix Stroke VJut 0.5]
+			include : HBar.m GammaBarLeft (RightSB - [xMidBarShrink doSM]) yBar
+			if doSM : include : tagged 'serifRM'
+				VSerif.dr (RightSB - [xMidBarShrink doSM]) (yBar + HalfStroke) [mix Stroke VJut 0.5]
 
 		create-glyph "cyrl/GheDescender.\(suffix)" : glyph-proc
 			include [refer-glyph "grek/Gamma.\(suffix)"] AS_BASE ALSO_METRICS
@@ -163,9 +163,11 @@ glyph-block Letter-Greek-Upper-Gamma: begin
 		include : BBBarLeft GammaBarLeft 0 CAP
 		include : HBar.t GammaBarLeft RightSB CAP BBS
 
-	create-glyph 'digamma' 0x3DD : glyph-proc
+	create-glyph 'grek/digamma' 0x3DD : glyph-proc
 		include : MarkSet.p
-		include : GammaShape (XH - Descender) SLAB-NONE
-		include : ApparentTranslate 0 Descender
-		local yBar : mix Descender XH DesignParameters.upperEBarPos
+		include : GammaShape XH SLAB-NONE
+		include : PalatalHook.lExt GammaBarLeft 0
+		local yBar : mix 0 XH DesignParameters.upperEBarPos
 		include : HBar.m GammaBarLeft (RightSB - [xMidBarShrink SLAB]) yBar
+		if SLAB : include : tagged 'serifRM'
+			VSerif.dr (RightSB - [xMidBarShrink SLAB]) (yBar + HalfStroke) [mix Stroke VJut 0.5]