diff --git a/Makefile b/Makefile
index 177c029..37a308a 100644
--- a/Makefile
+++ b/Makefile
@@ -1,5 +1,5 @@
 .PHONY: release
 release:
-	@sd '(^\s*default\s*=\s*")([\d.v]+)("$$)' '$${1}$(VERSION)$${3}' terraform/variables.tf
+	@sd '(^\s*default\s*=\s*")([\w.-]+)("$$)' '$${1}$(VERSION)$${3}' terraform/variables.tf
 	@git add -- terraform/variables.tf
 	@git commit -m "Release $(VERSION)"
diff --git a/terraform/variables.tf b/terraform/variables.tf
index 7323a34..c13e50b 100644
--- a/terraform/variables.tf
+++ b/terraform/variables.tf
@@ -1,5 +1,5 @@
 variable "release_version" {
-  default = "v1.0.0-RC3"
+  default = "v1.0.0-RC4"
 }
 
 variable "version_url" {