diff --git a/lsystems_easy/Cargo.toml b/lsystems_easy/Cargo.toml
index 9324050..4f2c715 100644
--- a/lsystems_easy/Cargo.toml
+++ b/lsystems_easy/Cargo.toml
@@ -7,4 +7,8 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-turtle = "1.0.0-rc.3"
\ No newline at end of file
+# Use this particular commit of the turtle crate
+turtle = {git = "https://github.com/sunjay/turtle", rev = "0a30fd36c7f345d973c39ad9eca3614f543c8dbb"}
+
+[profile.dev.package."*"]
+opt-level = 3
\ No newline at end of file
diff --git a/lsystems_interpreter0/Cargo.toml b/lsystems_interpreter0/Cargo.toml
index 9ad8370..b9b477c 100644
--- a/lsystems_interpreter0/Cargo.toml
+++ b/lsystems_interpreter0/Cargo.toml
@@ -7,4 +7,9 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-turtle = "1.0.0-rc.3"
\ No newline at end of file
+# Use this particular commit of the turtle crate
+turtle = {git = "https://github.com/sunjay/turtle", rev = "0a30fd36c7f345d973c39ad9eca3614f543c8dbb"}
+
+
+[profile.dev.package."*"]
+opt-level = 3
\ No newline at end of file
diff --git a/lsystems_interpreter1/Cargo.toml b/lsystems_interpreter1/Cargo.toml
index f23e01b..e64b825 100644
--- a/lsystems_interpreter1/Cargo.toml
+++ b/lsystems_interpreter1/Cargo.toml
@@ -7,4 +7,9 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-turtle = "1.0.0-rc.3"
+# Use this particular commit of the turtle crate
+turtle = {git = "https://github.com/sunjay/turtle", rev = "0a30fd36c7f345d973c39ad9eca3614f543c8dbb"}
+
+
+[profile.dev.package."*"]
+opt-level = 3
\ No newline at end of file
diff --git a/lsystems_interpreter2/Cargo.toml b/lsystems_interpreter2/Cargo.toml
index f6c69b7..8e763ba 100644
--- a/lsystems_interpreter2/Cargo.toml
+++ b/lsystems_interpreter2/Cargo.toml
@@ -7,4 +7,9 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-turtle = "1.0.0-rc.3"
\ No newline at end of file
+# Use this particular commit of the turtle crate
+turtle = {git = "https://github.com/sunjay/turtle", rev = "0a30fd36c7f345d973c39ad9eca3614f543c8dbb"}
+
+
+[profile.dev.package."*"]
+opt-level = 3
\ No newline at end of file
diff --git a/lsystems_nice/Cargo.toml b/lsystems_nice/Cargo.toml
index 3a279dd..9a32901 100644
--- a/lsystems_nice/Cargo.toml
+++ b/lsystems_nice/Cargo.toml
@@ -7,4 +7,10 @@ edition = "2018"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-turtle = { version = "1.0.0-rc.3" }
\ No newline at end of file
+# Use this particular commit of the turtle crate
+turtle = {git = "https://github.com/sunjay/turtle", rev = "0a30fd36c7f345d973c39ad9eca3614f543c8dbb"}
+
+
+
+[profile.dev.package."*"]
+opt-level = 3
\ No newline at end of file