diff --git a/Cargo.toml b/Cargo.toml
index 8fb0bae..effa2b4 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -26,7 +26,7 @@ unstable = []  # for benchmarking
 
 [dependencies]
 serde = { version = "1.0", default-features = false, optional = true }
-schemars = { version = "0.8.0", optional = true }
+schemars = { version = "<=0.8.3", optional = true }
 core2 = { version = "0.3.0", optional = true, default_features = false }
 
 [dev-dependencies]
diff --git a/extended_tests/schemars/Cargo.toml b/extended_tests/schemars/Cargo.toml
index c860e76..b204a20 100644
--- a/extended_tests/schemars/Cargo.toml
+++ b/extended_tests/schemars/Cargo.toml
@@ -12,6 +12,6 @@ features = ['schemars', 'serde']
 [dependencies]
 jsonschema-valid = "^0.4.0"
 serde = { version = "1.0", default-features = false}
-schemars = { version = "0.8.0"}
+schemars = { version = "<=0.8.3"}
 serde_test = "1.0"
 serde_json = "1.0"