diff --git a/.github/workflows/android_ci.yml b/.github/workflows/android_ci.yml
--- a/.github/workflows/android_ci.yml
+++ b/.github/workflows/android_ci.yml
@@ -19,6 +19,21 @@
     steps:
       - uses: actions/checkout@v3
 
+      - name: Clear unused NDKs
+        run: |
+          ls -1 "$ANDROID_SDK_ROOT/ndk" |
+            awk '{
+              if (system("git grep " $0 " > /dev/null")) {
+                system("rm -rf '"$ANDROID_SDK_ROOT/ndk/"'" $0);
+              }
+            }'
+
+      - name: Delete all iOS simulators
+        run: xcrun simctl delete all
+
+      - name: Delete iOS simulator caches
+        run: sudo rm -rf ~/Library/Developer/CoreSimulator/Caches/*
+
       - name: rustup target add aarch64-linux-android arm-linux-androideabi x86_64-linux-android
         run: rustup target add aarch64-linux-android arm-linux-androideabi x86_64-linux-android
 
diff --git a/.github/workflows/android_release.yml b/.github/workflows/android_release.yml
--- a/.github/workflows/android_release.yml
+++ b/.github/workflows/android_release.yml
@@ -12,6 +12,21 @@
     steps:
       - uses: actions/checkout@v3
 
+      - name: Clear unused NDKs
+        run: |
+          ls -1 "$ANDROID_SDK_ROOT/ndk" |
+            awk '{
+              if (system("git grep " $0 " > /dev/null")) {
+                system("rm -rf '"$ANDROID_SDK_ROOT/ndk/"'" $0);
+              }
+            }'
+
+      - name: Delete all iOS simulators
+        run: xcrun simctl delete all
+
+      - name: Delete iOS simulator caches
+        run: sudo rm -rf ~/Library/Developer/CoreSimulator/Caches/*
+
       - name: rustup target add aarch64-linux-android arm-linux-androideabi x86_64-linux-android
         run: rustup target add aarch64-linux-android arm-linux-androideabi x86_64-linux-android