diff --git a/defaults/main.yml b/defaults/main.yml
index 092af7a..9c9b971 100644
--- a/defaults/main.yml
+++ b/defaults/main.yml
@@ -1,7 +1,7 @@
 ---
 
 # Cantaloupe version
-cantaloupe_version: 4.1.7
+cantaloupe_version: 4.1.9
 # Where to extract the cantaloupe archive
 cantaloupe_install_root: /opt
 # Target of a symlink from the extracted cantaloupe archive
diff --git a/templates/cantaloupe.properties.j2 b/templates/cantaloupe.properties.j2
index 8fac8f8..9cfbb87 100644
--- a/templates/cantaloupe.properties.j2
+++ b/templates/cantaloupe.properties.j2
@@ -44,6 +44,15 @@ base_uri = {{ cantaloupe_base_uri }}
 # percent-encoded version in URLs.
 slash_substitute = {{ cantaloupe_slash_substitute }}
 
+# Parses an identifier's scale constraint suffix.
+# This key only applies to versions >= 4.1.9 and < 5.0.
+scale_constraint_suffix.pattern = -(\d+):(\d+)\b
+
+# Converts a scale constraint suffix to its URL format. {n} and {d} are the
+# numerator and denominator, respectively.
+# This key only applies to versions >= 4.1.9 and < 5.0.
+scale_constraint_suffix.format = -{n}:{d}
+
 # Maximum number of pixels to return in a response, to prevent overloading
 # the server. Requests for more pixels than this will receive an error
 # response. Set to 0 for no maximum.