diff --git a/genome_grist/conf/env/papermill.yml b/genome_grist/conf/env/papermill.yml
index 1f344ea..fa1af7a 100644
--- a/genome_grist/conf/env/papermill.yml
+++ b/genome_grist/conf/env/papermill.yml
@@ -10,5 +10,5 @@ dependencies:
     - matplotlib>=3.4.3,<4
     - numpy>=1.21.3,<2
     - pandas>=1.3.4,<2
-    - sourmash>=4.5.0,<4.6
+    - sourmash>=4.6.1,<5
     - python>=3.8,<3.10
diff --git a/genome_grist/conf/env/sourmash.yml b/genome_grist/conf/env/sourmash.yml
index a7fa396..4fb32bc 100755
--- a/genome_grist/conf/env/sourmash.yml
+++ b/genome_grist/conf/env/sourmash.yml
@@ -4,8 +4,8 @@ channels:
  - defaults
 dependencies:
  - python>=3.8,<3.10
- - screed
- - sourmash>=4.5.0,<4.6
+ - screed>=1.1,<2
+ - sourmash>=4.6.1,<5
  - pip
  - pip:
    - git+https://github.com/dib-lab/genome-grist.git#egg=genome-grist
diff --git a/setup.cfg b/setup.cfg
index 2925963..337e2a6 100644
--- a/setup.cfg
+++ b/setup.cfg
@@ -9,4 +9,4 @@ test =
     pytest>=5.1.2,<7.3.0
     pytest-cov
     pytest-dependency
-    sourmash>=4.5.0,<4.6.0
+    sourmash>=4.6.1,<5