diff --git a/metrics-observer-json/Cargo.toml b/metrics-observer-json/Cargo.toml
index 048a1626..e2d93c96 100644
--- a/metrics-observer-json/Cargo.toml
+++ b/metrics-observer-json/Cargo.toml
@@ -18,5 +18,5 @@ keywords = ["metrics", "telemetry", "json"]
 [dependencies]
 metrics-core = { path = "../metrics-core", version = "^0.5" }
 metrics-util = { path = "../metrics-util", version = "^0.3" }
-hdrhistogram = "^6.1"
+hdrhistogram = { version = "^6.3", default-features = false }
 serde_json = "^1.0"
diff --git a/metrics-observer-prometheus/Cargo.toml b/metrics-observer-prometheus/Cargo.toml
index 0e298bd0..50ce8579 100644
--- a/metrics-observer-prometheus/Cargo.toml
+++ b/metrics-observer-prometheus/Cargo.toml
@@ -18,4 +18,4 @@ keywords = ["metrics", "telemetry", "prometheus"]
 [dependencies]
 metrics-core = { path = "../metrics-core", version = "^0.5" }
 metrics-util = { path = "../metrics-util", version = "^0.3" }
-hdrhistogram = "^6.1"
+hdrhistogram = { version = "^6.3", default-features = false }
diff --git a/metrics-observer-yaml/Cargo.toml b/metrics-observer-yaml/Cargo.toml
index c9baaf6a..af49979e 100644
--- a/metrics-observer-yaml/Cargo.toml
+++ b/metrics-observer-yaml/Cargo.toml
@@ -18,5 +18,5 @@ keywords = ["metrics", "telemetry", "yaml"]
 [dependencies]
 metrics-core = { path = "../metrics-core", version = "^0.5" }
 metrics-util = { path = "../metrics-util", version = "^0.3" }
-hdrhistogram = "^6.1"
+hdrhistogram = { version = "^6.3", default-features = false }
 serde_yaml = "^0.8"