diff --git a/test/rust/bindgen_greeter/Cargo.toml b/test/rust/bindgen_greeter/Cargo.toml
index a4c57b38669af..e85537f374191 100644
--- a/test/rust/bindgen_greeter/Cargo.toml
+++ b/test/rust/bindgen_greeter/Cargo.toml
@@ -10,4 +10,4 @@ path = "src/main.rs"
 # 0.2.128 is the first release whose emscripten glue does not need an aggregate
 # `wasmExports` object (wasm-bindgen/wasm-bindgen#5270); must match the wasm-bindgen-cli
 # version exactly.
-wasm-bindgen = "0.2.128"
+wasm-bindgen = "=0.2.128"
diff --git a/test/test_other.py b/test/test_other.py
index 03f4579ea107c..c8e595b889f7f 100644
--- a/test/test_other.py
+++ b/test/test_other.py
@@ -15364,7 +15364,7 @@ def test_wasm_bindgen_integration(self):
     copytree(test_file('rust/bindgen_integration'), '.')
     # Pin the library to the (managed) wasm-bindgen-cli version on PATH;
     # wasm-bindgen requires the CLI and the library to match exactly.
-    self.run_process(['cargo', 'add', 'wasm-bindgen@0.2.128'])
+    self.run_process(['cargo', 'add', 'wasm-bindgen@=0.2.128'])
     self.run_process(['cargo', 'build'])
     lib = 'target/wasm32-unknown-emscripten/debug/libbindgen_integration.a'
     self.assertExists(lib)
@@ -15460,7 +15460,7 @@ def test_wasm_bindgen_tsd_multi_return(self):
           Ok(42)
       }
     ''')
-    self.run_process(['cargo', 'add', 'wasm-bindgen@0.2.128'])
+    self.run_process(['cargo', 'add', 'wasm-bindgen@=0.2.128'])
     self.run_process(['cargo', 'build'])
     lib = 'target/wasm32-unknown-emscripten/debug/libbindgen_integration.a'
     create_file('empty.c', '')