diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 63b478e..6896f9d 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -35,8 +35,7 @@ jobs:
         with:
           workspaces: contracts
       - run: cargo build --all
-      # cargo test is temporarily disabled — stellar-xdr 20.1.0 transitively
-      # pulls a broken `arbitrary` feature on fresh CI builds. See issue #79.
+      - run: cargo test -p invisible-wallet
 
   sdk:
     name: SDK — typecheck & test
diff --git a/contracts/Cargo.lock b/contracts/Cargo.lock
index 2f0076c..3a7c798 100644
--- a/contracts/Cargo.lock
+++ b/contracts/Cargo.lock
@@ -773,6 +773,7 @@ checksum = "8e04e2fd2b8188ea827b32ef11de88377086d690286ab35747ef7f9bf3ccb590"
 name = "invisible-wallet"
 version = "0.1.0"
 dependencies = [
+ "arbitrary",
  "p256",
  "sha2 0.11.0",
  "soroban-sdk",
diff --git a/contracts/invisible_wallet/Cargo.toml b/contracts/invisible_wallet/Cargo.toml
index c3e48b4..a87c0e0 100644
--- a/contracts/invisible_wallet/Cargo.toml
+++ b/contracts/invisible_wallet/Cargo.toml
@@ -10,6 +10,7 @@ crate-type = ["cdylib"]
 soroban-sdk = "22.0.0"
 
 [dev-dependencies]
+arbitrary = { version = "=1.3.2", features = ["derive"] }
 soroban-sdk = { version = "22.0.0", features = ["testutils"] }
 p256 = { version = "0.13", features = ["ecdsa", "std"] }
 sha2 = { version = "0.11" }