diff --git a/conda/meta.yaml b/conda/meta.yaml
index 04dd29678..5717bc4c1 100644
--- a/conda/meta.yaml
+++ b/conda/meta.yaml
@@ -22,7 +22,7 @@ requirements:
     - ipython
     - typing_extensions
     - nlopt
-    - multimethod >=1.11,<2.0
+    - multimethod >=2.1,<3.0
     - casadi
     - runtype
     - numba
diff --git a/environment.yml b/environment.yml
index 4608af03b..e560f62a5 100644
--- a/environment.yml
+++ b/environment.yml
@@ -18,7 +18,7 @@ dependencies:
   - nlopt
   - casadi
   - runtype
-  - multimethod >=1.11,<2.0
+  - multimethod>=2.1,<3.0
   - typed-ast
   - regex
   - pathspec