diff --git a/scripts/generate_unicode_data.cr b/scripts/generate_unicode_data.cr
index 58c385217d5d..a807c750253a 100644
--- a/scripts/generate_unicode_data.cr
+++ b/scripts/generate_unicode_data.cr
@@ -69,7 +69,7 @@ def alternate_ranges(ranges)
       # Continue streak
     else
       if first_codepoint
-        alternate << AlternateRange.new(first_codepoint, last_codepoint.not_nil!)
+        alternate << new_alternate_range(first_codepoint, last_codepoint)
       end
       first_codepoint = codepoint
     end
@@ -78,12 +78,18 @@ def alternate_ranges(ranges)
   end
 
   if first_codepoint
-    alternate << AlternateRange.new(first_codepoint, last_codepoint.not_nil!)
+    alternate << new_alternate_range(first_codepoint, last_codepoint)
   end
 
   alternate
 end
 
+def new_alternate_range(first_codepoint, last_codepoint)
+  # The last codepoint is the one for the uppercase letter and we
+  # need to also consider the next codepoint for the lowercase one.
+  AlternateRange.new(first_codepoint, last_codepoint.not_nil! + 1)
+end
+
 def strides(entries, targets)
   strides = [] of Stride
 
diff --git a/spec/std/string_spec.cr b/spec/std/string_spec.cr
index 73fe7929edde..80dcd6f281a0 100644
--- a/spec/std/string_spec.cr
+++ b/spec/std/string_spec.cr
@@ -534,6 +534,7 @@ describe "String" do
     it { "aeiou".upcase(Unicode::CaseOptions::Turkic).should eq("AEİOU") }
     it { "baffle".upcase.should eq("BAFFLE") }
     it { "ff".upcase.should eq("FF") }
+    it { "ňž".upcase.should eq("ŇŽ") } # #7922
   end
 
   describe "capitalize" do
diff --git a/src/unicode/data.cr b/src/unicode/data.cr
index d0e2e3098267..d5d27eb27b61 100644
--- a/src/unicode/data.cr
+++ b/src/unicode/data.cr
@@ -293,63 +293,63 @@ module Unicode
   private def self.alternate_ranges
     @@alternate_ranges ||= begin
       data = Array({Int32, Int32}).new(57)
-      put(data, 256, 302)
-      put(data, 306, 310)
-      put(data, 313, 327)
-      put(data, 330, 374)
-      put(data, 377, 381)
-      put(data, 386, 388)
-      put(data, 391, 391)
-      put(data, 395, 395)
-      put(data, 401, 401)
-      put(data, 408, 408)
-      put(data, 416, 420)
-      put(data, 423, 423)
-      put(data, 428, 428)
-      put(data, 431, 431)
-      put(data, 435, 437)
-      put(data, 440, 440)
-      put(data, 444, 444)
-      put(data, 453, 453)
-      put(data, 456, 456)
-      put(data, 459, 475)
-      put(data, 478, 494)
-      put(data, 498, 500)
-      put(data, 504, 542)
-      put(data, 546, 562)
-      put(data, 571, 571)
-      put(data, 577, 577)
-      put(data, 582, 590)
-      put(data, 880, 882)
-      put(data, 886, 886)
-      put(data, 984, 1006)
-      put(data, 1015, 1015)
-      put(data, 1018, 1018)
-      put(data, 1120, 1152)
-      put(data, 1162, 1214)
-      put(data, 1217, 1229)
-      put(data, 1232, 1326)
-      put(data, 7680, 7828)
-      put(data, 7840, 7934)
-      put(data, 8579, 8579)
-      put(data, 11360, 11360)
-      put(data, 11367, 11371)
-      put(data, 11378, 11378)
-      put(data, 11381, 11381)
-      put(data, 11392, 11490)
-      put(data, 11499, 11501)
-      put(data, 11506, 11506)
-      put(data, 42560, 42604)
-      put(data, 42624, 42650)
-      put(data, 42786, 42798)
-      put(data, 42802, 42862)
-      put(data, 42873, 42875)
-      put(data, 42878, 42886)
-      put(data, 42891, 42891)
-      put(data, 42896, 42898)
-      put(data, 42902, 42920)
-      put(data, 42932, 42942)
-      put(data, 42946, 42946)
+      put(data, 256, 303)
+      put(data, 306, 311)
+      put(data, 313, 328)
+      put(data, 330, 375)
+      put(data, 377, 382)
+      put(data, 386, 389)
+      put(data, 391, 392)
+      put(data, 395, 396)
+      put(data, 401, 402)
+      put(data, 408, 409)
+      put(data, 416, 421)
+      put(data, 423, 424)
+      put(data, 428, 429)
+      put(data, 431, 432)
+      put(data, 435, 438)
+      put(data, 440, 441)
+      put(data, 444, 445)
+      put(data, 453, 454)
+      put(data, 456, 457)
+      put(data, 459, 476)
+      put(data, 478, 495)
+      put(data, 498, 501)
+      put(data, 504, 543)
+      put(data, 546, 563)
+      put(data, 571, 572)
+      put(data, 577, 578)
+      put(data, 582, 591)
+      put(data, 880, 883)
+      put(data, 886, 887)
+      put(data, 984, 1007)
+      put(data, 1015, 1016)
+      put(data, 1018, 1019)
+      put(data, 1120, 1153)
+      put(data, 1162, 1215)
+      put(data, 1217, 1230)
+      put(data, 1232, 1327)
+      put(data, 7680, 7829)
+      put(data, 7840, 7935)
+      put(data, 8579, 8580)
+      put(data, 11360, 11361)
+      put(data, 11367, 11372)
+      put(data, 11378, 11379)
+      put(data, 11381, 11382)
+      put(data, 11392, 11491)
+      put(data, 11499, 11502)
+      put(data, 11506, 11507)
+      put(data, 42560, 42605)
+      put(data, 42624, 42651)
+      put(data, 42786, 42799)
+      put(data, 42802, 42863)
+      put(data, 42873, 42876)
+      put(data, 42878, 42887)
+      put(data, 42891, 42892)
+      put(data, 42896, 42899)
+      put(data, 42902, 42921)
+      put(data, 42932, 42943)
+      put(data, 42946, 42947)
       data
     end
   end