diff --git a/Makefile b/Makefile
index 205e46c09..a2d8a7d44 100644
--- a/Makefile
+++ b/Makefile
@@ -10,7 +10,7 @@ BUILDFLAGS := --release --strip
 RUNFLAGS :=
 CHECKABLE_PY := pylib qt
 CHECKABLE_RS := rslib
-DEVEL := rspy pylib qt
+DEVEL := rslib rspy pylib qt
 
 .PHONY: all
 all: run
diff --git a/rslib/Cargo.toml b/rslib/Cargo.toml
index 1379b0592..2b589a0d2 100644
--- a/rslib/Cargo.toml
+++ b/rslib/Cargo.toml
@@ -1,6 +1,6 @@
 [package]
 name = "anki"
-version = "0.1.0"
+version = "2.1.20" # automatically updated
 edition = "2018"
 authors = ["Ankitects Pty Ltd and contributors"]
 license = "AGPL-3.0-or-later"
diff --git a/rslib/Makefile b/rslib/Makefile
index 42f822b41..cc214b075 100644
--- a/rslib/Makefile
+++ b/rslib/Makefile
@@ -6,7 +6,7 @@ MAKEFLAGS += --no-builtin-rules
 
 $(shell mkdir -p .build)
 
-.PHONY: all check fix clean
+.PHONY: all check fix clean develop
 
 all: check
 
@@ -18,6 +18,8 @@ fix:
 clean:
 	rm -rf .build target
 
+develop: .build/vernum
+
 PROTO_SOURCE := $(wildcard ../proto/*.proto)
 RS_SOURCE := $(wildcard src/*)
 ALL_SOURCE := $(RS_SOURCE) $(PROTO_SOURCE)
@@ -38,3 +40,9 @@ RUST_TOOLCHAIN := $(shell cat rust-toolchain)
 	cargo fmt -- --check
 	cargo clippy -- -D warnings
 	@touch $@
+
+VER := $(shell cat ../meta/version)
+.build/vernum: ../meta/version
+	sed -i.bak 's/.*automatically updated.*/version = "$(VER)" # automatically updated/' Cargo.toml
+	rm Cargo.toml.bak
+	@touch $@