diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c2203cafe..dc11ebea5 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -207,7 +207,7 @@ jobs:
         run: |
           import toml
           cargo_toml = toml.load("Cargo.toml")
-          cargo_toml["dependencies"]["ndarray"] = "0.13.1"
+          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"
@@ -225,8 +225,8 @@ jobs:
           cargo_lock = toml.load("Cargo.lock")
           for pkg in cargo_lock["package"]:
             pkg_id = pkg["name"] + ":" + pkg["version"]
-            if pkg["name"] == "ndarray" and pkg["version"] != "0.13.1":
-              subprocess.run(["cargo", "update", "--package", pkg_id, "--precise", "0.13.1"], check=True)
+            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":
diff --git a/README.md b/README.md
index b0e105bd5..d90960ab7 100644
--- a/README.md
+++ b/README.md
@@ -133,17 +133,17 @@ For example, if you specify the following dependencies
 
 ```toml
 numpy = "0.21"
-ndarray = "0.13"
+ndarray = "0.15"
 ```
 
-this will currently depend on both version `0.13.1` and `0.15.3` of `ndarray` by default
-even though `0.13.1` is within the range `>= 0.13, < 0.16`. To fix this, you can run
+this will currently depend on both version `0.15.6` and `0.16.1` of `ndarray` by default
+even though `0.15.6` is within the range `>= 0.15, < 0.17`. To fix this, you can run
 
 ```sh
-cargo update --package ndarray:0.15.3 --precise 0.13.1
+cargo update --package ndarray:0.16.1 --precise 0.15.6
 ```
 
-to achieve a single dependency on version `0.13.1` of `ndarray`.
+to achieve a single dependency on version `0.15.6` of `ndarray`.
 
 ## Contributing