diff --git a/Cargo.lock b/Cargo.lock
index 1fd46e4b3f..dcd070d6e0 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -8846,11 +8846,11 @@ dependencies = [
 
 [[package]]
 name = "reltester"
-version = "2.0.0"
-source = "git+https://github.com/sovereign-labs/reltester.git?rev=d6209abff72929f5ba41614f5cea3e4a748428c3#d6209abff72929f5ba41614f5cea3e4a748428c3"
+version = "2.1.0"
+source = "git+https://github.com/sovereign-labs/reltester.git?rev=e5ee0a7850a8fc8a747604dc3084530a63eecfd9#e5ee0a7850a8fc8a747604dc3084530a63eecfd9"
 dependencies = [
  "rand 0.8.5",
- "thiserror 1.0.69",
+ "thiserror 2.0.17",
 ]
 
 [[package]]
diff --git a/Cargo.toml b/Cargo.toml
index 85595acdcb..d526f1d921 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -200,7 +200,7 @@ nearly-linear = { path = "crates/utils/nearly-linear", version = "0.3" }
 sov-proxy-utils = { path = "crates/utils/sov-proxy-utils", version = "0.3" }
 # Dependencies maintained by Sovereign
 jmt = { version = "0.12.0", default-features = false }
-reltester = { git = "https://github.com/sovereign-labs/reltester.git", rev = "d6209abff72929f5ba41614f5cea3e4a748428c3" }
+reltester = { git = "https://github.com/sovereign-labs/reltester.git", rev = "e5ee0a7850a8fc8a747604dc3084530a63eecfd9" }
 rockbound = { git = "https://github.com/sovereign-labs/rockbound", rev = "00d4a84f0b9256da681e2138949e01e4c138a5ae" }
 nmt-rs = { version = "0.2.5", features = ["serde", "borsh"] }
 # External dependencies