diff --git a/ffi/gn/Cargo.lock b/ffi/gn/Cargo.lock
index d0e6f37d03b..42041956238 100644
--- a/ffi/gn/Cargo.lock
+++ b/ffi/gn/Cargo.lock
@@ -214,6 +214,7 @@ name = "icu"
 version = "1.2.0"
 dependencies = [
  "icu_calendar",
+ "icu_casemap",
  "icu_collator",
  "icu_collections",
  "icu_datetime",
@@ -250,6 +251,7 @@ dependencies = [
  "diplomat-runtime",
  "fixed_decimal",
  "icu_calendar",
+ "icu_casemap",
  "icu_collator",
  "icu_collections",
  "icu_datetime",
@@ -279,6 +281,20 @@ dependencies = [
  "icu_provider",
 ]
 
+[[package]]
+name = "icu_casemap"
+version = "1.2.0"
+dependencies = [
+ "displaydoc",
+ "icu_collections",
+ "icu_locid",
+ "icu_properties",
+ "icu_provider",
+ "writeable",
+ "yoke",
+ "zerovec",
+]
+
 [[package]]
 name = "icu_collator"
 version = "1.2.0"
diff --git a/ffi/gn/icu4x/BUILD.gn b/ffi/gn/icu4x/BUILD.gn
index 11b7769f9b6..4a34b487b12 100644
--- a/ffi/gn/icu4x/BUILD.gn
+++ b/ffi/gn/icu4x/BUILD.gn
@@ -175,6 +175,7 @@ rust_library("icu-v1_2_0") {
 
   deps = []
   deps += [ ":icu_calendar-v1_2_0" ]
+  deps += [ ":icu_casemap-v1_2_0" ]
   deps += [ ":icu_collator-v1_2_0" ]
   deps += [ ":icu_collections-v1_2_0" ]
   deps += [ ":icu_datetime-v1_2_1" ]
@@ -237,6 +238,7 @@ rust_library("icu_capi-v1_2_2") {
   deps += [ ":diplomat-runtime-v0_5_2" ]
   deps += [ ":fixed_decimal-v0_5_3" ]
   deps += [ ":icu_calendar-v1_2_0" ]
+  deps += [ ":icu_casemap-v1_2_0" ]
   deps += [ ":icu_collator-v1_2_0" ]
   deps += [ ":icu_collections-v1_2_0" ]
   deps += [ ":icu_datetime-v1_2_1" ]
@@ -267,6 +269,7 @@ rust_library("icu_capi-v1_2_2") {
     "-Cextra-filename=-7fdd0dfbc90c4949",
     "--cfg=feature=\"default_components\"",
     "--cfg=feature=\"icu_calendar\"",
+    "--cfg=feature=\"icu_casemap\"",
     "--cfg=feature=\"icu_collator\"",
     "--cfg=feature=\"icu_datetime\"",
     "--cfg=feature=\"icu_decimal\"",
@@ -282,6 +285,33 @@ rust_library("icu_capi-v1_2_2") {
   visibility = [ ":*" ]
 }
 
+rust_library("icu_casemap-v1_2_0") {
+  crate_name = "icu_casemap"
+  crate_root = "//components/casemap/src/lib.rs"
+  output_name = "icu_casemap-14fac046168d59e4"
+
+  deps = []
+  deps += [ ":displaydoc-v0_2_4($host_toolchain)" ]
+  deps += [ ":icu_collections-v1_2_0" ]
+  deps += [ ":icu_locid-v1_2_0" ]
+  deps += [ ":icu_properties-v1_2_0" ]
+  deps += [ ":icu_provider-v1_2_0" ]
+  deps += [ ":writeable-v0_5_2" ]
+  deps += [ ":yoke-v0_7_1" ]
+  deps += [ ":zerovec-v0_9_4" ]
+
+  rustenv = []
+
+  rustflags = [
+    "--cap-lints=allow",
+    "--edition=2021",
+    "-Cmetadata=14fac046168d59e4",
+    "-Cextra-filename=-14fac046168d59e4",
+  ]
+
+  visibility = [ ":*" ]
+}
+
 rust_library("icu_collator-v1_2_0") {
   crate_name = "icu_collator"
   crate_root = "//components/collator/src/lib.rs"