diff --git a/lang/zh/README.md b/lang/zh/README.md
index 3fcbb55..88032e7 100644
--- a/lang/zh/README.md
+++ b/lang/zh/README.md
@@ -14,7 +14,7 @@
 * tabulate>=0.8.2
 * tqdm>=4.26.0
 * control>=0.8.2 (for generalized random walk kernels only)
-* slycot==0.3.3 (for generalized random walk kernels only, which requires a fortran compiler, gfortran for example)
+* slycot>0.4.0 (for generalized random walk kernels only, which requires a fortran compiler, gfortran for example)
 
 ## 如何使用？