diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index dc11ebea5..0a29fd050 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -208,9 +208,6 @@ jobs:
           import toml
           cargo_toml = toml.load("Cargo.toml")
           cargo_toml["dependencies"]["ndarray"] = "0.15.6"
-          cargo_toml["dependencies"]["parking_lot"] = "0.11.2"
-          cargo_toml["dependencies"]["num-complex"] = "0.2.4"
-          cargo_toml["dependencies"]["once_cell"] = "1.14.0"
           with open("Cargo.toml", "w") as f:
             toml.dump(cargo_toml, f)
         working-directory: examples/simple
@@ -227,10 +224,6 @@ jobs:
             pkg_id = pkg["name"] + ":" + pkg["version"]
             if pkg["name"] == "ndarray" and pkg["version"] != "0.15.6":
               subprocess.run(["cargo", "update", "--package", pkg_id, "--precise", "0.15.6"], check=True)
-            elif pkg["name"] == "parking_lot" and pkg["version"] != "0.11.2":
-              subprocess.run(["cargo", "update", "--package", pkg_id, "--precise", "0.11.2"], check=True)
-            elif pkg["name"] == "once_cell" and pkg["version"] != "1.14.0":
-              subprocess.run(["cargo", "update", "--package", pkg_id, "--precise", "1.14.0"], check=True)
         working-directory: examples/simple
         shell: python
       - name: Test example