diff --git a/.github/workflows/clojure.yml b/.github/workflows/clojure.yml
index 39a3d4b..1386906 100644
--- a/.github/workflows/clojure.yml
+++ b/.github/workflows/clojure.yml
@@ -12,10 +12,10 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: git submodule
       run: git submodule init && git submodule update
     - name: install dependencies
-      run: lein deps
+      run: bin/lein deps
     - name: run tests
-      run: lein test
+      run: bin/lein test
diff --git a/.gitmodules b/.gitmodules
index 0664a73..af5702b 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,6 +1,3 @@
 [submodule "vendors/mmj2"]
 	path = vendors/mmj2
 	url = https://github.com/digama0/mmj2.git
-[submodule "vendors/JSON-java/org/json"]
-	path = vendors/JSON-java/org/json
-	url = https://github.com/digama0/JSON-java.git
diff --git a/project.clj b/project.clj
index bbe9ab9..9344b22 100644
--- a/project.clj
+++ b/project.clj
@@ -2,19 +2,20 @@
   :description "metamath toolkit on top of mmj2"
   :url "https://github.com/mountain/mmtk"
   :license {:name "GPL-2.0"}
-  :dependencies [[org.openjdk.nashorn/nashorn-core "15.3"]
-                 [org.clojure/clojure "1.10.3"]
-                 [clj-commons/clj-yaml "0.7.107"]
-                 [cli-matic "0.4.3"]
-                 [clj-http "3.12.3"]
-                 [hbs "1.0.3"]
-                 [http-kit "2.5.3"]
-                 [compojure "1.6.2"]
-                 [ring/ring-core "1.9.5"]
-                 [org.clojure/tools.logging "1.2.4"]
-                 [org.slf4j/slf4j-nop "1.7.36"]]
+  :dependencies [[org.openjdk.nashorn/nashorn-core "15.7"]
+                 [org.clojure/clojure "1.12.5"]
+                 [org.json/json "20260719"]
+                 [clj-commons/clj-yaml "1.0.29"]
+                 [cli-matic "0.5.4"]
+                 [clj-http "3.13.1"]
+                 [hbs "1.1.0"]
+                 [http-kit "2.8.1"]
+                 [compojure "1.7.2"]
+                 [ring/ring-core "1.15.5"]
+                 [org.clojure/tools.logging "1.3.1"]
+                 [org.slf4j/slf4j-nop "2.0.18"]]
   :source-paths ["src/main/clojure"]
-  :java-source-paths ["src/main/java" "vendors/mmj2/src" "vendors/JSON-java/"]
+  :java-source-paths ["src/main/java" "vendors/mmj2/src/main/java"]
   :resource-paths ["src/main/resources"]
 
   :test-paths ["src/tests/java/" "src/tests/clojure/"]
diff --git a/vendors/JSON-java/org/json b/vendors/JSON-java/org/json
deleted file mode 160000
index edfb0c5..0000000
--- a/vendors/JSON-java/org/json
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit edfb0c57d5619bc7444364451a6d6201457136e7
diff --git a/vendors/mmj2 b/vendors/mmj2
index 8f49fb2..c8dd055 160000
--- a/vendors/mmj2
+++ b/vendors/mmj2
@@ -1 +1 @@
-Subproject commit 8f49fb2c93531c5c75fcb65886837c8d0617c033
+Subproject commit c8dd05548139c7003220caedde65a7abe44a00bf