diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index a8a686b..46737a5 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -99,4 +99,5 @@ jobs:
       - uses: actions-rust-lang/setup-rust-toolchain@v1
         with:
           toolchain: ${{ matrix.toolchain }}
+      - run: cp Cargo.lock.minimal Cargo.lock
       - run: cargo test --lib --bins ${{ matrix.features }}
\ No newline at end of file
diff --git a/Cargo.lock.minimal b/Cargo.lock.minimal
new file mode 100644
index 0000000..6a1479d
--- /dev/null
+++ b/Cargo.lock.minimal
@@ -0,0 +1,113 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "assert-eq-float"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "dac07e0aa40147757d4ecf64af44bc64ff41de7ef29003b9658eea0aa646e4be"
+dependencies = [
+ "num-traits",
+]
+
+[[package]]
+name = "educe"
+version = "0.6.0"
+dependencies = [
+ "assert-eq-float",
+ "enum-ordinalize",
+ "proc-macro2",
+ "quote",
+ "rustversion",
+ "syn 2.0.0",
+]
+
+[[package]]
+name = "enum-ordinalize"
+version = "4.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6926bbe8b379bb3d8e9fb718a0496481531f338866666a848e6a02da99ffab79"
+dependencies = [
+ "enum-ordinalize-derive",
+]
+
+[[package]]
+name = "enum-ordinalize-derive"
+version = "4.2.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2db7c1c42a2d894e6040d9847cd27954483b054d722e52b37aa01a7334737656"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 2.0.0",
+]
+
+[[package]]
+name = "num-traits"
+version = "0.2.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0b3c2bd9b9d21e48e956b763c9f37134dc62d9e95da6edb3f672cacb6caf3cd3"
+
+[[package]]
+name = "proc-macro2"
+version = "1.0.52"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "1d0e1ae9e836cc3beddd63db0df682593d7e2d3d891ae8c9083d2113e1744224"
+dependencies = [
+ "unicode-ident",
+]
+
+[[package]]
+name = "quote"
+version = "1.0.26"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4424af4bf778aae2051a77b60283332f386554255d722233d09fbfc7e30da2fc"
+dependencies = [
+ "proc-macro2",
+]
+
+[[package]]
+name = "rustversion"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c48f91977f4ef3be5358c15d131d3f663f6b4d7a112555bf3bf52ad23b6659e5"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "syn 1.0.1",
+]
+
+[[package]]
+name = "syn"
+version = "1.0.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "863ecbce06044c8380458360b4146d7372edadfedd77f120ba8c193da427b708"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-xid",
+]
+
+[[package]]
+name = "syn"
+version = "2.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4cff13bb1732bccfe3b246f3fdb09edfd51c01d6f5299b7ccd9457c2e4e37774"
+dependencies = [
+ "proc-macro2",
+ "quote",
+ "unicode-ident",
+]
+
+[[package]]
+name = "unicode-ident"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d22af068fba1eb5edcb4aea19d382b2a3deb4c8f9d475c589b6ada9e0fd493ee"
+
+[[package]]
+name = "unicode-xid"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "826e7639553986605ec5979c7dd957c7895e93eabed50ab2ffa7f6128a75097c"
diff --git a/Cargo.toml b/Cargo.toml
index cb192a2..fcd25d6 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -20,7 +20,7 @@ syn = "2"
 quote = "1"
 proc-macro2 = "1"
 
-enum-ordinalize = { version = "4.2", default-features = false, features = ["derive"] }
+enum-ordinalize = { version = "4.2.1", default-features = false, features = ["derive"] }
 
 [dev-dependencies]
 syn = { version = "2", features = ["full"] }
diff --git a/maint/update-minimal-versions b/maint/update-minimal-versions
new file mode 100755
index 0000000..b085a59
--- /dev/null
+++ b/maint/update-minimal-versions
@@ -0,0 +1,20 @@
+#! /bin/bash
+
+set -e
+set -o pipefail
+
+: "${CARGO:=cargo}"
+
+if test -e Cargo.lock.aside; then
+	rm -f Cargo.lock
+else
+	mv Cargo.lock Cargo.lock.aside
+fi
+
+$CARGO +nightly update  -Z minimal-versions
+
+# assert-eq-float has a too-relaxed dependency and only works with num-traits 0.2.1
+$CARGO update --precise=0.2.1 -p num-traits
+
+mv Cargo.lock Cargo.lock.minimal
+mv Cargo.lock.aside Cargo.lock