diff --git a/crates/cards/Cargo.toml b/crates/cards/Cargo.toml
index 4d38d3118f82..00445936e3d2 100644
--- a/crates/cards/Cargo.toml
+++ b/crates/cards/Cargo.toml
@@ -19,3 +19,6 @@ time = "0.3.21"
 # First party crates
 common_utils = { version = "0.1.0", path = "../common_utils" }
 masking = { version = "0.1.0", path = "../masking" }
+
+[dev-dependencies]
+serde_json = "1.0.96"
diff --git a/crates/common_enums/Cargo.toml b/crates/common_enums/Cargo.toml
index b33d9d61f56d..db37d27ab0f1 100644
--- a/crates/common_enums/Cargo.toml
+++ b/crates/common_enums/Cargo.toml
@@ -20,3 +20,6 @@ utoipa = { version = "3.3.0", features = ["preserve_order"] }
 
 # First party crates
 router_derive = { version = "0.1.0", path = "../router_derive" }
+
+[dev-dependencies]
+serde_json = "1.0.96"
diff --git a/crates/common_utils/Cargo.toml b/crates/common_utils/Cargo.toml
index 4438350a44e2..62bd747da1b0 100644
--- a/crates/common_utils/Cargo.toml
+++ b/crates/common_utils/Cargo.toml
@@ -46,3 +46,8 @@ common_enums = { version = "0.1.0", path = "../common_enums" }
 
 [target.'cfg(not(target_os = "windows"))'.dependencies]
 signal-hook-tokio = { version = "0.3.1", features = ["futures-v0_3"], optional = true }
+
+[dev-dependencies]
+fake = "2.6.1"
+proptest = "1.2.0"
+test-case = "3.1.0"
diff --git a/crates/euclid/Cargo.toml b/crates/euclid/Cargo.toml
index 6cd28115f5dc..f0e24b1ff63c 100644
--- a/crates/euclid/Cargo.toml
+++ b/crates/euclid/Cargo.toml
@@ -29,6 +29,9 @@ connector_choice_mca_id = []
 dummy_connector = []
 backwards_compatibility = ["connector_choice_bcompat"]
 
+[dev-dependencies]
+criterion = "0.5"
+
 [[bench]]
 name = "backends"
 harness = false
diff --git a/crates/kgraph_utils/Cargo.toml b/crates/kgraph_utils/Cargo.toml
index a1cb25e935b5..fa90b3974c20 100644
--- a/crates/kgraph_utils/Cargo.toml
+++ b/crates/kgraph_utils/Cargo.toml
@@ -19,6 +19,9 @@ serde = "1.0.163"
 serde_json = "1.0.96"
 thiserror = "1.0.43"
 
+[dev-dependencies]
+criterion = "0.5"
+
 [[bench]]
 name = "evaluation"
 harness = false
diff --git a/crates/masking/Cargo.toml b/crates/masking/Cargo.toml
index 67ae3448ac1d..21d791642895 100644
--- a/crates/masking/Cargo.toml
+++ b/crates/masking/Cargo.toml
@@ -22,3 +22,6 @@ serde = { version = "1", features = ["derive"], optional = true }
 serde_json = "1.0.96"
 subtle = "=2.4.1"
 zeroize = { version = "1.6", default-features = false }
+
+[dev-dependencies]
+serde_json = "1.0.96"
diff --git a/crates/redis_interface/Cargo.toml b/crates/redis_interface/Cargo.toml
index 633233e21829..8066787dcae2 100644
--- a/crates/redis_interface/Cargo.toml
+++ b/crates/redis_interface/Cargo.toml
@@ -18,3 +18,6 @@ tokio = "1.28.2"
 # First party crates
 common_utils = { version = "0.1.0", path = "../common_utils", features = ["async_ext"] }
 router_env = { version = "0.1.0", path = "../router_env", features = ["log_extra_implicit_fields", "log_custom_entries_to_extra"] }
+
+[dev-dependencies]
+tokio = { version = "1.28.2", features = ["macros", "rt-multi-thread"] }
diff --git a/crates/router/Cargo.toml b/crates/router/Cargo.toml
index 253062f9e8f2..0d7b89dd8d4f 100644
--- a/crates/router/Cargo.toml
+++ b/crates/router/Cargo.toml
@@ -121,6 +121,21 @@ signal-hook-tokio = { version = "0.3.1", features = ["futures-v0_3"] }
 [build-dependencies]
 router_env = { version = "0.1.0", path = "../router_env", default-features = false }
 
+[dev-dependencies]
+actix-http = "3.3.1"
+awc = { version = "3.1.1", features = ["rustls"] }
+derive_deref = "1.1.1"
+rand = "0.8.5"
+serial_test = "2.0.0"
+thirtyfour = "0.31.0"
+time = { version = "0.3.21", features = ["macros"] }
+tokio = "1.28.2"
+toml = "0.7.4"
+wiremock = "0.5"
+
+# First party dev-dependencies
+test_utils = { version = "0.1.0", path = "../test_utils" }
+
 [[bin]]
 name = "router"
 path = "src/bin/router.rs"
diff --git a/crates/router_derive/Cargo.toml b/crates/router_derive/Cargo.toml
index 4d82afc38eb6..b4e60a8c2a33 100644
--- a/crates/router_derive/Cargo.toml
+++ b/crates/router_derive/Cargo.toml
@@ -17,3 +17,9 @@ indexmap = "2.0.0"
 proc-macro2 = "1.0.56"
 quote = "1.0.26"
 syn = { version = "1.0.109", features = ["full", "extra-traits"] } # the full feature does not seem to encompass all the features
+
+[dev-dependencies]
+diesel = { version = "2.1.0", features = ["postgres"] }
+serde = { version = "1.0.163", features = ["derive"] }
+serde_json = "1.0.96"
+strum = { version = "0.24.1", features = ["derive"] }
diff --git a/crates/router_env/Cargo.toml b/crates/router_env/Cargo.toml
index dea11e4ef7fe..266baf0e3863 100644
--- a/crates/router_env/Cargo.toml
+++ b/crates/router_env/Cargo.toml
@@ -30,6 +30,9 @@ tracing-opentelemetry = { version = "0.19.0" }
 tracing-subscriber = { version = "0.3.17", default-features = true, features = ["env-filter", "json", "registry"] }
 vergen = { version = "8.2.1", optional = true, features = ["cargo", "git", "git2", "rustc"] }
 
+[dev-dependencies]
+tokio = { version = "1.28.2", features = ["macros", "rt-multi-thread"] }
+
 [build-dependencies]
 cargo_metadata = "0.15.4"
 vergen = { version = "8.2.1", features = ["cargo", "git", "git2", "rustc"], optional = true }