diff --git a/ci/310-oldest.yaml b/ci/310-oldest.yaml
index c83d00f..b0fa575 100644
--- a/ci/310-oldest.yaml
+++ b/ci/310-oldest.yaml
@@ -7,7 +7,7 @@ dependencies:
   # required
   - esda=2.1.1
   - libpysal=4.0.1
-  - quantecon=0.4.7
+  - quantecon=0.5.2
   - scipy=1.3.0
   - splot
   # testing
diff --git a/ci/39-oldest.yaml b/ci/39-oldest.yaml
index 67f107d..c2052b5 100644
--- a/ci/39-oldest.yaml
+++ b/ci/39-oldest.yaml
@@ -6,7 +6,7 @@ dependencies:
   # required
   - esda=2.1.1
   - libpysal=4.0.1
-  - quantecon=0.4.7
+  - quantecon=0.5.2
   - scipy=1.3.0
   - splot
   # testing
diff --git a/pyproject.toml b/pyproject.toml
index 33ad125..713d6e1 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -25,7 +25,7 @@ requires-python = ">=3.9"
 dependencies = [
     "esda>=2.1.1",
     "libpysal>=4.0.1",
-    "quantecon>=0.4.7",
+    "quantecon>=0.5.2",
     "scipy>=1.3",
 ]