diff --git a/conda/conda_build_config.yaml b/conda/conda_build_config.yaml
index 288df1f..35246cd 100644
--- a/conda/conda_build_config.yaml
+++ b/conda/conda_build_config.yaml
@@ -1,8 +1,11 @@
 python:
-  - 3.7
   - 3.8
-  - 3.9
 
 numpy:
-  - 1.11
-  - 1.19
+  - 1.20
+
+gsl:
+  - 2.4
+
+pin_run_as_build:
+  gsl: x.x
diff --git a/conda/meta.yaml b/conda/meta.yaml
index 249bebd..0993d98 100644
--- a/conda/meta.yaml
+++ b/conda/meta.yaml
@@ -8,17 +8,17 @@ source:
 
 requirements:
   build:
-    - numpy >=1.11
+    - numpy {{ numpy }}
     - {{ compiler('c') }}
     - {{ compiler('cxx') }}
-    - python
+    - python {{ python }}
     - setuptools
     - cython
     - healpy
     - numexpr
     - cffi
     - pyfftw
-    - gsl
+    - gsl {{ gsl }}
     - h5py
 
   host:
@@ -30,6 +30,7 @@ requirements:
     - pyfftw
     - gsl
     - h5py
+    - numpy
 
   run:
     - numpy