diff --git a/developer/src/server/build.sh b/developer/src/server/build.sh
index c73ed853f7..e0e82e3617 100755
--- a/developer/src/server/build.sh
+++ b/developer/src/server/build.sh
@@ -113,7 +113,17 @@ function installer_server() {
   # monorepo context
   cat package.json | "$JQ" \
     '. | del(.devDependencies."@keymanapp/resources-gosh") | del(.devDependencies."@keymanapp/keyman-version") | del(.dependencies."@keymanapp/developer-utils")' \
+    > "$PRODBUILDTEMP/package0.json"
+
+  # #12950: Merge dependencies from @keymanapp/developer-utils and Server; this
+  # is a bit messy but will mean we don't lose the needed dependencies.
+  "$JQ" -s '.[0] + { dependencies: (.[1].dependencies * .[0].dependencies) }' "$PRODBUILDTEMP/package0.json" \
+   "$KEYMAN_ROOT/developer/src/common/web/utils/package.json" > "$PRODBUILDTEMP/package1.json"
+  cat $PRODBUILDTEMP/package1.json | "$JQ" \
+    '. | del(.dependencies."@keymanapp/common-types")' \
     > "$PRODBUILDTEMP/package.json"
+  rm "$PRODBUILDTEMP/package0.json"
+  rm "$PRODBUILDTEMP/package1.json"
 
   pushd "$PRODBUILDTEMP"
   npm install --omit=dev --omit=optional