diff --git a/diesel/Cargo.toml b/diesel/Cargo.toml
index 24ad2afe8fc5..b9da265a9b72 100644
--- a/diesel/Cargo.toml
+++ b/diesel/Cargo.toml
@@ -26,10 +26,10 @@ url = { version = "1.4.0", optional = true }
 uuid = { version = ">=0.2.0, <0.7.0", optional = true, features = ["use_std"] }
 uuidv07 = { version = ">=0.7.0, <0.9.0", optional = true, package = "uuid"}
 ipnetwork = { version = ">=0.12.2, <0.18.0", optional = true }
-num-bigint = { version = ">=0.1.41, <0.4", optional = true }
+num-bigint = { version = ">=0.1.41, <0.3", optional = true }
 num-traits = { version = ">=0.1.37, <0.3", optional = true }
 num-integer = { version = ">=0.1.33, <0.3", optional = true }
-bigdecimal = { version = ">= 0.0.10, < 0.3.0", optional = true }
+bigdecimal = { version = ">= 0.0.10, < 0.2.0", optional = true }
 bitflags = { version = "1.0", optional = true }
 r2d2 = { version = ">= 0.8, < 0.9", optional = true }
 
diff --git a/diesel_tests/Cargo.toml b/diesel_tests/Cargo.toml
index dd3b7b77847a..806e67d463be 100644
--- a/diesel_tests/Cargo.toml
+++ b/diesel_tests/Cargo.toml
@@ -22,7 +22,7 @@ quickcheck = { version = "0.4", features = ["unstable"] }
 uuid = { version = ">=0.7.0, <0.9.0" }
 serde_json = { version=">=0.9, <2.0" }
 ipnetwork = ">=0.12.2, <0.18.0"
-bigdecimal = ">= 0.0.10, < 0.3.0"
+bigdecimal = ">= 0.0.10, < 0.2.0"
 
 [features]
 default = []